diff --git a/.envexample b/.envexample
new file mode 100644
index 0000000000000000000000000000000000000000..bf60eea616ab07d99d5445a25fad969ea2ee26a8
--- /dev/null
+++ b/.envexample
@@ -0,0 +1,5 @@
+PRIVATE_KEY=
+INFURA_PROJECT_ID=
+COINMARKETCAP_API_KEY=
+ETHERSCAN_API_KEY=
+BSC_API_KEY=
\ No newline at end of file
diff --git a/README.md b/README.md
index 4c4565eaf79960be6eef76b4082e6030dc446892..39af52c077c0d4c3bc7730b362592e0bf7f635db 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,29 @@
-# Pilot Client
+# README #
 
+This README would normally document whatever steps are necessary to get your application up and running.
+
+### What is this repository for? ###
+
+* Quick summary
+* Version
+* [Learn Markdown](https://bitbucket.org/tutorials/markdowndemo)
+
+### How do I get set up? ###
+
+* Summary of set up
+* Configuration
+* Dependencies
+* Database configuration
+* How to run tests
+* Deployment instructions
+
+### Contribution guidelines ###
+
+* Writing tests
+* Code review
+* Other guidelines
+
+### Who do I talk to? ###
+
+* Repo owner or admin
+* Other community or team contact
\ No newline at end of file
diff --git a/arguments.js b/arguments.js
new file mode 100644
index 0000000000000000000000000000000000000000..4942f1b4156bf379c8fac10d1306beaf608e4a25
--- /dev/null
+++ b/arguments.js
@@ -0,0 +1,4 @@
+module.exports = [
+    // "0x97c35747AbE05EFD38A1Fc081a42600fdfB1e2F1", // xft token address
+    // "0xA542a8Ed9E40eb6C39Dcc0b7d3293BA174C8DbE1", // price consumer address
+  ];
diff --git a/contracts/CommitmentCircuit.sol b/contracts/CommitmentCircuit.sol
new file mode 100644
index 0000000000000000000000000000000000000000..128961960bde283afed7ec213bf0e8cfc9c0d68d
--- /dev/null
+++ b/contracts/CommitmentCircuit.sol
@@ -0,0 +1,341 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.4;
+
+import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
+import "./SchnorrSignature.sol";
+import "./interfaces/IERC20MintableBurnable.sol";
+import "./interfaces/IPriceConsumer.sol";
+
+contract CommitmentCircuit is SchnorrSignature {
+	using SafeERC20 for IERC20;
+
+	enum Assets {
+		XFT,
+		USD,
+		BTC,
+		ETH,
+		XAU
+	}
+
+	struct CommitmentDetails {
+		PointEC commitment;
+		Assets asset;
+	}
+
+	IERC20MintableBurnable public xftTokenAddress;
+	IPriceConsumer public priceConsumer;
+
+	event CommitmentTransferred(
+		address indexed sender,
+		address indexed recipient,
+		uint256 senderCommitmentId,
+		uint256 recipientCommitmentId,
+		PointEC senderCommitment,
+		PointEC recipientCommitment
+	);
+	event Deposited(
+		address indexed to,
+		uint256 amount,
+		uint256 indexed commitmentId,
+		PointEC commitment
+	);
+	event Withdrawn(
+		address indexed to,
+		uint256 amount,
+		uint256 indexed commitmentIdOld,
+		PointEC commitmentOld
+	);
+	event Excessed(address indexed to, uint256 indexed commitmentId, PointEC commitment);
+	event Grouped(address indexed to, uint256 indexed id, PointEC commitment);
+
+	// todo: public is temporary
+	mapping(address => uint256[]) public _idsByAddress;
+	mapping(address => mapping(uint256 => CommitmentDetails)) public _commitmentById;
+	mapping(address => mapping(uint256 => bool)) public _spents;
+
+	constructor(address _xftTokenAddress, address _priceConsumer) {
+		require(_xftTokenAddress != address(0), "Token address not be zero");
+		require(_priceConsumer != address(0), "Price consumer address not be zero");
+		xftTokenAddress = IERC20MintableBurnable(_xftTokenAddress);
+		priceConsumer = IPriceConsumer(_priceConsumer);
+	}
+
+	/**
+	 * @dev Transfer commitment between users.
+	 * @param recipient address of commitment recipient.
+	 * @param senderCommitmentId id of the sending commitment.
+	 * @param recipientCommitment new commitment that will be received by recipient:
+	 		commitment - new commitment
+			asset - asset of commitment.
+	 * @param excessCommitment Commitment for excess amount.
+	 * @param senderPubKey Sender's public key.
+	 * @param recipientPubKey Recipient's public key.
+	 * @param excessPubKey Public key for excess amount.
+	 * @param schnorrSignatureSet Set of Schnorr params:
+	 * 		message - Signed message
+	 * 		pubKey - Public key with which message was signed
+	 *		ecR - Signature part R
+	 * 		s - Signature part s.
+	 */
+	function complexTransferCommitment(
+		address recipient,
+		uint256 senderCommitmentId,
+		CommitmentDetails memory recipientCommitment,
+		PointEC memory excessCommitment,
+		PointEC memory senderPubKey,
+		PointEC memory recipientPubKey,
+		PointEC memory excessPubKey,
+		SlotSchnorrSignature memory schnorrSignatureSet
+	) public {
+		require(
+			SchnorrSignatureVerify(
+				schnorrSignatureSet.message,
+				schnorrSignatureSet.publicKey,
+				schnorrSignatureSet.ecR,
+				schnorrSignatureSet.s
+			),
+			"invalid signature"
+		);
+
+		CommitmentDetails memory senderCommitment = _commitmentById[msg.sender][
+			senderCommitmentId
+		];
+
+		require(senderCommitment.asset == recipientCommitment.asset, "Different assets");
+		require(!_spents[msg.sender][senderCommitmentId], "Commitment already used");
+		PointEC memory _ecVerify;
+		PointEC memory _ecSum;
+		(_ecVerify.x, _ecVerify.y) = eAdd(
+			recipientPubKey.x,
+			recipientPubKey.y,
+			excessPubKey.x,
+			excessPubKey.y
+		);
+		(_ecVerify.x, _ecVerify.y) = eSub(
+			senderPubKey.x,
+			senderPubKey.y,
+			_ecVerify.x,
+			_ecVerify.y
+		);
+
+		(_ecSum.x, _ecSum.y) = eAdd(
+			recipientCommitment.commitment.x,
+			recipientCommitment.commitment.y,
+			excessCommitment.x,
+			excessCommitment.y
+		);
+
+		require(
+			_CommitmentVerify(senderCommitment.commitment, _ecSum, _ecVerify),
+			"invalid commitments"
+		);
+
+		_spents[msg.sender][senderCommitmentId] = true;
+
+		uint256 _id = _CommitmentNewAdd(
+			recipient,
+			recipientCommitment.commitment,
+			recipientCommitment.asset
+		);
+
+		emit CommitmentTransferred(
+			msg.sender,
+			recipient,
+			senderCommitmentId,
+			_id,
+			senderCommitment.commitment,
+			recipientCommitment.commitment
+		);
+
+		_id = _CommitmentNewAdd(msg.sender, excessCommitment, recipientCommitment.asset);
+
+		emit Excessed(msg.sender, _id, excessCommitment);
+	}
+
+	/**
+	 * @dev Deposit xft tokens and save commitment to user.
+	 * @param amountIn amount of xft to be swapped.
+	 * @param amountComm amount of zkAsset to be deposited.
+	 * @param recipientCommitment new commitment that will be saved for user:
+	 		commitment - new commitment
+			asset - asset of commitment.
+	 * @param schnorrSignatureSet Set of Schnorr params:
+	 * 		message - Signed message
+	 * 		pubKey - Public key with which message was signed
+	 *		ecR - Signature part R
+	 * 		s - Signature part s.
+	 */
+	function deposit(
+		uint256 amountIn,
+		uint256 amountComm,
+		CommitmentDetails memory recipientCommitment,
+		SlotSchnorrSignature memory schnorrSignatureSet
+	) public {
+		require(amountIn != 0 && amountComm != 0, "Amount cannot be 0");
+		(uint256 currPrice, ) = priceConsumer.exchangeAssets(
+			uint8(recipientCommitment.asset),
+			uint8(Assets.XFT),
+			amountComm
+		);
+		require(amountIn == currPrice, "Incorrect input amount");
+
+		require(
+			SchnorrSignatureVerify(
+				schnorrSignatureSet.message,
+				schnorrSignatureSet.publicKey,
+				schnorrSignatureSet.ecR,
+				schnorrSignatureSet.s
+			),
+			"invalid signature"
+		);
+
+		PointEC memory ecH = _genPointEC(abi.encodePacked(gx, gy));
+		(uint256 x, uint256 y) = ePedersenCommitmentPK(
+			amountComm,
+			schnorrSignatureSet.publicKey.x,
+			schnorrSignatureSet.publicKey.y,
+			ecH.x,
+			ecH.y
+		);
+		require(
+			x == recipientCommitment.commitment.x && y == recipientCommitment.commitment.y,
+			"this amount cannot be deposited"
+		);
+
+		IERC20(xftTokenAddress).safeTransferFrom(msg.sender, address(this), amountIn);
+		xftTokenAddress.burn(amountIn);
+		uint256 id = _CommitmentNewAdd(
+			msg.sender,
+			recipientCommitment.commitment,
+			recipientCommitment.asset
+		);
+
+		emit Deposited(msg.sender, amountIn, id, _commitmentById[msg.sender][id].commitment);
+	}
+
+	/**
+	 * @dev Withdraw xft tokens.
+	 * @param amount of xft to be withdrawn.
+	 * @param recipientCommitmentOldId id of the withdrawn commitment.
+	 * @param schnorrSignatureSet Set of Schnorr params:
+	 * 		message - Signed message
+	 * 		pubKey - Public key with which message was signed
+	 *		ecR - Signature part R
+	 * 		s - Signature part s.
+	 */
+	function withdraw(
+		uint256 amount,
+		uint256 recipientCommitmentOldId,
+		SlotSchnorrSignature memory schnorrSignatureSet
+	) public {
+		require(
+			SchnorrSignatureVerify(
+				schnorrSignatureSet.message,
+				schnorrSignatureSet.publicKey,
+				schnorrSignatureSet.ecR,
+				schnorrSignatureSet.s
+			),
+			"invalid signature"
+		);
+		require(!_spents[msg.sender][recipientCommitmentOldId], "commitment already used");
+
+		PointEC memory ecH = _genPointEC(abi.encodePacked(gx, gy));
+		PointEC memory userCommitment = _commitmentById[msg.sender][recipientCommitmentOldId]
+			.commitment;
+		(uint256 x, uint256 y) = ePedersenCommitmentPK(
+			amount,
+			schnorrSignatureSet.publicKey.x,
+			schnorrSignatureSet.publicKey.y,
+			ecH.x,
+			ecH.y
+		);
+		require(x == userCommitment.x && y == userCommitment.y, "this amount cannot be withdrawn");
+
+		(uint256 xftAmount, ) = priceConsumer.exchangeAssets(
+			uint8(_commitmentById[msg.sender][recipientCommitmentOldId].asset),
+			uint8(Assets.XFT),
+			amount
+		);
+
+		xftTokenAddress.mint(msg.sender, xftAmount);
+		_spents[msg.sender][recipientCommitmentOldId] = true;
+
+		emit Withdrawn(msg.sender, amount, recipientCommitmentOldId, userCommitment);
+	}
+
+	/**
+	 * @dev Group commitments with same assets, create new groupped commitment.
+	 * @param _commIds Commitment ids that must be closed.
+	 * @param _asset Commitmen asset.
+	 * @param _ecNewCommitment New commitment.
+	 * @param _pkSum Elliptic curve point for verification new commitment. 
+	 	Subtracting grouped commitment and new must be equal to this point 
+		(_pkSum = subtraction sum of public keys used for already existen commitments and public key used for new commitment)
+	 */
+	function groupCommitment(
+		uint256[] memory _commIds,
+		Assets _asset,
+		PointEC memory _ecNewCommitment,
+		PointEC memory _pkSum
+	) public {
+		PointEC memory grouped = _commitmentById[msg.sender][_commIds[0]].commitment;
+
+		for (uint256 i = 1; i < _commIds.length; i++) {
+			require(
+				_commitmentById[msg.sender][_commIds[i - 1]].asset ==
+					_commitmentById[msg.sender][_commIds[i]].asset,
+				"Commitments with different assets"
+			);
+			(grouped.x, grouped.y) = eAdd(
+				grouped.x,
+				grouped.y,
+				_commitmentById[msg.sender][_commIds[i]].commitment.x,
+				_commitmentById[msg.sender][_commIds[i]].commitment.y
+			);
+		}
+
+		require(_CommitmentVerify(grouped, _ecNewCommitment, _pkSum), "invalid commitment");
+
+		for (uint256 i = 0; i < _commIds.length; i++) {
+			_spents[msg.sender][_commIds[i]] = true;
+		}
+
+		uint256 id = _CommitmentNewAdd(msg.sender, _ecNewCommitment, _asset);
+		emit Grouped(msg.sender, id, _ecNewCommitment);
+	}
+
+	/**
+	 * @dev Save commitment to user with id.
+	 * @param _newOwner Address of user.
+	 * @param _commitment Commitment.
+	 * @param _asset Commitmen asset.
+	 */
+	function _CommitmentNewAdd(
+		address _newOwner,
+		PointEC memory _commitment,
+		Assets _asset
+	) internal returns (uint256) {
+		uint256 _id = _idsByAddress[_newOwner].length + 1;
+		_commitmentById[_newOwner][_id].commitment = _commitment;
+		_commitmentById[_newOwner][_id].asset = _asset;
+		_idsByAddress[_newOwner].push(_id);
+		_spents[_newOwner][_id] = false;
+		return _id;
+	}
+
+	/**
+	 * @dev Function for verify 2 commitments. Subtracting two points must be equal to the third point.
+	 * @param _ecCommInput First point.
+	 * @param _ecCommOutput Second point.
+	 * @param _ecCommValid Point of equality with the result of subtraction 2 points.
+	 */
+	function _CommitmentVerify(
+		PointEC memory _ecCommInput,
+		PointEC memory _ecCommOutput,
+		PointEC memory _ecCommValid
+	) internal pure returns (bool) {
+		PointEC memory _ecP;
+		(_ecP.x, _ecP.y) = eSub(_ecCommInput.x, _ecCommInput.y, _ecCommOutput.x, _ecCommOutput.y);
+		return _equalPointEC(_ecP, _ecCommValid);
+	}
+}
diff --git a/contracts/EC/EllipticCurve.sol b/contracts/EC/EllipticCurve.sol
new file mode 100644
index 0000000000000000000000000000000000000000..86e97c92c4184a244e7ea932d4ed7f6627d89867
--- /dev/null
+++ b/contracts/EC/EllipticCurve.sol
@@ -0,0 +1,169 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.4;
+
+import "./EllipticCurveMath.sol";
+
+contract EllipticCurve {
+    // y^2 = x^3 + a*x + b (mod p) - elliptic curve
+	// aa, bb, (gx, gy), pp, nn - recommended parameters for elliptic curve secp256k1
+	uint256 public constant pp =
+		uint256(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F); // prime number p, constraint for y^2
+	uint256 public constant nn =
+		uint256(0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141); // prime number n, constraint for x
+	// gx, gy - base point G coordinates
+	uint256 public constant gx =
+		uint256(0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798);
+	uint256 public constant gy =
+		uint256(0x483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8);
+	uint256 public constant aa =
+		uint256(0x0000000000000000000000000000000000000000000000000000000000000000);
+	uint256 public constant bb =
+		uint256(0x0000000000000000000000000000000000000000000000000000000000000007);
+
+	/**
+	 * @dev eAdd returns the sum of (x1,y1) and (x2,y2) elliptic curve points coordinates.
+	 * @param _x1 X coordinate of first point.
+	 * @param _y1 Y coordinate of first point.
+	 * @param _x2 X coordinate of second point.
+	 * @param _y2 Y coordinate of second point.
+	 * @return _x3 _y3 point coordinates.
+	 */
+	function eAdd(
+		uint256 _x1,
+		uint256 _y1,
+		uint256 _x2,
+		uint256 _y2
+	) public pure returns (uint256 _x3, uint256 _y3) {
+		(_x3, _y3) = EllipticCurveMath._ecAdd(_x1, _y1, _x2, _y2, 0, pp);
+	}
+
+	/**
+	 * @dev eSub substract two points (x1, y1) and (x2, y2).
+	 * @param _x1 X coordinate of first point.
+	 * @param _y1 Y coordinate of first point.
+	 * @param _x2 X coordinate of second point.
+	 * @param _y2 Y coordinate of second point.
+	 * @return _x3 _y3 point coordinates.
+	 */
+	function eSub(
+		uint256 _x1,
+		uint256 _y1,
+		uint256 _x2,
+		uint256 _y2
+	) public pure returns (uint256 _x3, uint256 _y3) {
+		(_x3, _y3) = EllipticCurveMath._ecSub(_x1, _y1, _x2, _y2, 0, pp);
+	}
+
+	/**
+	 * @dev Multiplies point by scalar and returns the resulting point.
+	 * @param _z scalar.
+	 * @param _x1 X coordinate of point.
+	 * @param _y1 Y coordinate of point.
+	 * @return _x2 _y2 point coordinates.
+	 */
+	function eMul(
+		uint256 _z,
+		uint256 _x1,
+		uint256 _y1
+	) public pure returns (uint256 _x2, uint256 _y2) {
+		(_x2, _y2) = EllipticCurveMath._ecMul(_z, _x1, _y1, 0, pp);
+	}
+
+	/**
+	 * @dev Returns EC point coordinate y with known x
+	 * @param _prefix parity byte (0x02 even, 0x03 odd).
+	 * @param _x coordinate x.
+	 * @return _y coordinate y.
+	 */
+	function eDeriveY(uint8 _prefix, uint256 _x) public pure returns (uint256 _y) {
+		_y = EllipticCurveMath._deriveY(_prefix, _x, aa, bb, pp);
+	}
+
+	/**
+	 * @dev Check is point on curve and return true if (x,y) in the curve, else - false
+	 * @param _x X coordinate of point.
+	 * @param _y Y coordinate of point.
+	 * @return _is result of check.
+	 */
+	function eIsOnCurve(uint256 _x, uint256 _y) public pure returns (bool _is) {
+		_is = EllipticCurveMath._isOnCurve(_x, _y, aa, bb, pp);
+	}
+
+	/**
+	 * @dev Modular euclidean inverse of a number (mod p).
+	 * @param _x value.
+	 * @param _pp mod.
+	 * @return _g inversed value.
+	 */
+	function invMod(uint256 _x, uint256 _pp) public pure returns (uint256 _g) {
+		_g = EllipticCurveMath._invMod(_x, _pp);
+	}
+
+	// Modular exponentiation, returns '_base' raised to the power of '_exp' modulo '_pp'
+	function expMod(
+		uint256 _base,
+		uint256 _exp,
+		uint256 _pp
+	) public pure returns (uint256 _r) {
+		_r = EllipticCurveMath._expMod(_base, _exp, _pp);
+	}
+
+	/**
+	 * @dev Generates the point of an elliptic curve inverted to (_x1, _y1)
+	 * @param _x1 Secret value x.
+	 * @param _y1 Blinding factor to x - r.
+	 * @return _x2 _y2 point coordinates.
+	 */
+	function eInv(uint256 _x1, uint256 _y1) public pure returns (uint256 _x2, uint256 _y2) {
+		(_x2, _y2) = EllipticCurveMath._ecInv(_x1, _y1, pp);
+	}
+
+	/**
+	 * @dev Generates Pederson Commitment with no fixed points x*G + r*H
+	 * @param _x Secret value x.
+	 * @param _r Blinding factor to x - r.
+	 * @param _gx X coordinate of point G.
+	 * @param _gy Y coordinate of point G.
+	 * @param _hx X coordinate of point H.
+	 * @param _hy Y coordinate of point H.
+	 * @return _x3 _y3 point coordinates.
+	 */
+	function ePedersenCommitment(
+		uint256 _x,
+		uint256 _r,
+		uint256 _gx,
+		uint256 _gy,
+		uint256 _hx,
+		uint256 _hy
+	) public pure returns (uint256 _x3, uint256 _y3) {
+		// x*G
+		(uint256 _x1, uint256 _y1) = eMul(_x, _gx, _gy);
+		// r*H
+		(uint256 _x2, uint256 _y2) = eMul(_r, _hx, _hy);
+		// x*G+r*H
+		(_x3, _y3) = eAdd(_x1, _y1, _x2, _y2);
+	}
+
+	/**
+	 * @dev Generates Pederson Commitment with no fixed points x*G + r*H, when x*G is already calculated.
+	 * @param _r Blinding factor to x - r.
+	 * @param _pkx X coordinate of calculated left part(x*G).
+	 * @param _pky Y coordinate of calculated left part(x*G).
+	 * @param _hx X coordinate of point H.
+	 * @param _hy Y coordinate of point H.
+	 * @return _x3 _y3 point coordinates.
+	 */
+	function ePedersenCommitmentPK(
+		uint256 _r,
+		uint256 _pkx,
+		uint256 _pky,
+		uint256 _hx,
+		uint256 _hy
+	) public pure returns (uint256 _x3, uint256 _y3) {
+		// _r*H
+		(uint256 _x2, uint256 _y2) = eMul(_r, _hx, _hy);
+		// _pkx - (x*H)
+		// _pkx + _r*H
+		(_x3, _y3) = eAdd(_pkx, _pky, _x2, _y2);
+	}
+}
diff --git a/contracts/EC/EllipticCurveMath.sol b/contracts/EC/EllipticCurveMath.sol
new file mode 100644
index 0000000000000000000000000000000000000000..3fb047a23174d77ae0fb4a530bec46fe0f21d2c5
--- /dev/null
+++ b/contracts/EC/EllipticCurveMath.sol
@@ -0,0 +1,358 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.4;
+
+//Elliptic Curve Library
+//Library providing arithmetic operations over elliptic curves.
+//This library does not check whether the inserted points belong to the curve
+//`isOnCurve` function should be used by the library user to check the aforementioned statement.
+//@author Witnet Foundation
+library EllipticCurveMath {
+	// Pre-computed constant for 2 ** 255
+	uint256 private constant _U255_MAX_PLUS_1 =
+		57896044618658097711785492504343953926634992332820282019728792003956564819968;
+
+	// Modular euclidean inverse of a number (mod p).
+	// q such that x*q = 1 (mod _pp)
+	function _invMod(uint256 _x, uint256 _pp) internal pure returns (uint256) {
+		require(_x != 0 && _x != _pp && _pp != 0, "Invalid number");
+		uint256 q = 0;
+		uint256 newT = 1;
+		uint256 r = _pp;
+		uint256 t;
+		while (_x != 0) {
+			t = r / _x;
+			(q, newT) = (newT, addmod(q, (_pp - mulmod(t, newT, _pp)), _pp));
+			(r, _x) = (_x, r - t * _x);
+		}
+
+		return q;
+	}
+
+	/// Modular exponentiation, b^e % _pp.
+	/// Source: https://github.com/androlo/standard-contracts/blob/master/contracts/src/crypto/ECCMath.sol
+	/// r such that r = b**e (mod _pp)
+	function _expMod(
+		uint256 _base,
+		uint256 _exp,
+		uint256 _pp
+	) internal pure returns (uint256) {
+		require(_pp != 0, "Modulus is zero");
+
+		if (_base == 0) return 0;
+		if (_exp == 0) return 1;
+
+		uint256 r = 1;
+		uint256 bit = _U255_MAX_PLUS_1;
+		assembly {
+			for {
+
+			} gt(bit, 0) {
+
+			} {
+				r := mulmod(mulmod(r, r, _pp), exp(_base, iszero(iszero(and(_exp, bit)))), _pp)
+				r := mulmod(
+					mulmod(r, r, _pp),
+					exp(_base, iszero(iszero(and(_exp, div(bit, 2))))),
+					_pp
+				)
+				r := mulmod(
+					mulmod(r, r, _pp),
+					exp(_base, iszero(iszero(and(_exp, div(bit, 4))))),
+					_pp
+				)
+				r := mulmod(
+					mulmod(r, r, _pp),
+					exp(_base, iszero(iszero(and(_exp, div(bit, 8))))),
+					_pp
+				)
+				bit := div(bit, 16)
+			}
+		}
+
+		return r;
+	}
+
+	// Converts a point (x, y, z) expressed in Jacobian coordinates to affine coordinates (x', y', 1).
+	// (x', y') affine coordinates
+	function _toAffine(
+		uint256 _x,
+		uint256 _y,
+		uint256 _z,
+		uint256 _pp
+	) internal pure returns (uint256, uint256) {
+		uint256 zInv = _invMod(_z, _pp);
+		uint256 zInv2 = mulmod(zInv, zInv, _pp);
+		uint256 x2 = mulmod(_x, zInv2, _pp);
+		uint256 y2 = mulmod(_y, mulmod(zInv, zInv2, _pp), _pp);
+
+		return (x2, y2);
+	}
+
+	// Derives the y coordinate from a compressed-format point x [[SEC-1]](https://www.secg.org/SEC1-Ver-1.0.pdf).
+	// _prefix parity byte (0x02 even, 0x03 odd)
+	// return y coordinate y
+	function _deriveY(
+		uint8 _prefix,
+		uint256 _x,
+		uint256 _aa,
+		uint256 _bb,
+		uint256 _pp
+	) internal pure returns (uint256) {
+		require(_prefix == 0x02 || _prefix == 0x03, "Invalid compressed EC point prefix");
+		// x^3 + ax + b
+		uint256 y2 = addmod(
+			mulmod(_x, mulmod(_x, _x, _pp), _pp),
+			addmod(mulmod(_x, _aa, _pp), _bb, _pp),
+			_pp
+		);
+		y2 = _expMod(y2, (_pp + 1) / 4, _pp);
+		uint256 y = (y2 + _prefix) % 2 == 0 ? y2 : _pp - y2;
+		return y;
+	}
+
+	// Check whether point (x,y) is on curve defined by a, b, and _pp.
+	//return true if x,y in the curve, false else
+	function _isOnCurve(
+		uint256 _x,
+		uint256 _y,
+		uint256 _aa,
+		uint256 _bb,
+		uint256 _pp
+	) internal pure returns (bool) {
+		if (0 == _x || _x >= _pp || 0 == _y || _y >= _pp) {
+			return false;
+		}
+		// y^2
+		uint256 lhs = mulmod(_y, _y, _pp);
+		// x^3
+		uint256 rhs = mulmod(mulmod(_x, _x, _pp), _x, _pp);
+		if (_aa != 0) {
+			// x^3 + a*x
+			rhs = addmod(rhs, mulmod(_x, _aa, _pp), _pp);
+		}
+		if (_bb != 0) {
+			// x^3 + a*x + b
+			rhs = addmod(rhs, _bb, _pp);
+		}
+
+		return lhs == rhs;
+	}
+
+	//Calculate inverse (x, -y) of point (x, y).
+	//return (x, -y)
+	function _ecInv(
+		uint256 _x,
+		uint256 _y,
+		uint256 _pp
+	) internal pure returns (uint256, uint256) {
+		return (_x, (_pp - _y) % _pp);
+	}
+
+	// Add two points (x1, y1) and (x2, y2) in affine coordinates.
+	// return (qx, qy) = P1+P2 in affine coordinates
+	function _ecAdd(
+		uint256 _x1,
+		uint256 _y1,
+		uint256 _x2,
+		uint256 _y2,
+		uint256 _aa,
+		uint256 _pp
+	) internal pure returns (uint256, uint256) {
+		uint256 x = 0;
+		uint256 y = 0;
+		uint256 z = 0;
+
+		if (_x1 == _x2) {
+			// y1 = -y2 mod p
+			if (addmod(_y1, _y2, _pp) == 0) {
+				return (0, 0);
+			} else {
+				// P1 = P2
+				(x, y, z) = _jacDouble(_x1, _y1, 1, _aa, _pp);
+			}
+		} else {
+			(x, y, z) = _jacAdd(_x1, _y1, 1, _x2, _y2, 1, _pp);
+		}
+		// Get back to affine
+		return _toAffine(x, y, z, _pp);
+	}
+
+	// Substract two points (x1, y1) and (x2, y2) in affine coordinates.
+	// return (qx, qy) = P1-P2 in affine coordinates
+	function _ecSub(
+		uint256 _x1,
+		uint256 _y1,
+		uint256 _x2,
+		uint256 _y2,
+		uint256 _aa,
+		uint256 _pp
+	) internal pure returns (uint256, uint256) {
+		// invert square
+		(uint256 x, uint256 y) = _ecInv(_x2, _y2, _pp);
+		// P1-square
+		return _ecAdd(_x1, _y1, x, y, _aa, _pp);
+	}
+
+	// Multiply point (x1, y1, z1) times d in affine coordinates.
+	// return (qx, qy) = d*P in affine coordinates
+	function _ecMul(
+		uint256 _k,
+		uint256 _x,
+		uint256 _y,
+		uint256 _aa,
+		uint256 _pp
+	) internal pure returns (uint256, uint256) {
+		// Jacobian multiplication
+		(uint256 x1, uint256 y1, uint256 z1) = _jacMul(_k, _x, _y, 1, _aa, _pp);
+		// Get back to affine
+		return _toAffine(x1, y1, z1, _pp);
+	}
+
+	// Adds two points (x1, y1, z1) and (x2 y2, z2).
+	// return (qx, qy, qz) P1+square in Jacobian
+	function _jacAdd(
+		uint256 _x1,
+		uint256 _y1,
+		uint256 _z1,
+		uint256 _x2,
+		uint256 _y2,
+		uint256 _z2,
+		uint256 _pp
+	)
+		internal
+		pure
+		returns (
+			uint256,
+			uint256,
+			uint256
+		)
+	{
+		if (_x1 == 0 && _y1 == 0) return (_x2, _y2, _z2);
+		if (_x2 == 0 && _y2 == 0) return (_x1, _y1, _z1);
+
+		// We follow the equations described in
+		// https://pdfs.semanticscholar.org/5c64/29952e08025a9649c2b0ba32518e9a7fb5c2.pdf Section 5
+		uint256[4] memory zs; // z1^2, z1^3, z2^2, z2^3
+		zs[0] = mulmod(_z1, _z1, _pp);
+		zs[1] = mulmod(_z1, zs[0], _pp);
+		zs[2] = mulmod(_z2, _z2, _pp);
+		zs[3] = mulmod(_z2, zs[2], _pp);
+
+		// u1, s1, u2, s2
+		zs = [
+			mulmod(_x1, zs[2], _pp),
+			mulmod(_y1, zs[3], _pp),
+			mulmod(_x2, zs[0], _pp),
+			mulmod(_y2, zs[1], _pp)
+		];
+
+		// In case of zs[0] == zs[2] && zs[1] == zs[3], double function should be used
+		require(zs[0] != zs[2] || zs[1] != zs[3], "Use jacDouble function instead");
+
+		uint256[4] memory hr;
+		//h
+		hr[0] = addmod(zs[2], _pp - zs[0], _pp);
+		//r
+		hr[1] = addmod(zs[3], _pp - zs[1], _pp);
+		//h^2
+		hr[2] = mulmod(hr[0], hr[0], _pp);
+		// h^3
+		hr[3] = mulmod(hr[2], hr[0], _pp);
+		// qx = -h^3  -2u1h^2+r^2
+		uint256 qx = addmod(mulmod(hr[1], hr[1], _pp), _pp - hr[3], _pp);
+		qx = addmod(qx, _pp - mulmod(2, mulmod(zs[0], hr[2], _pp), _pp), _pp);
+		// qy = -s1*z1*h^3+r(u1*h^2 -x^3)
+		uint256 qy = mulmod(hr[1], addmod(mulmod(zs[0], hr[2], _pp), _pp - qx, _pp), _pp);
+		qy = addmod(qy, _pp - mulmod(zs[1], hr[3], _pp), _pp);
+		// qz = h*z1*z2
+		uint256 qz = mulmod(hr[0], mulmod(_z1, _z2, _pp), _pp);
+		return (qx, qy, qz);
+	}
+
+	// Doubles a points (x, y, z).
+	// return (qx, qy, qz) 2P in Jacobian
+	function _jacDouble(
+		uint256 _x,
+		uint256 _y,
+		uint256 _z,
+		uint256 _aa,
+		uint256 _pp
+	)
+		internal
+		pure
+		returns (
+			uint256,
+			uint256,
+			uint256
+		)
+	{
+		if (_z == 0) return (_x, _y, _z);
+
+		// We follow the equations described in
+		// https://pdfs.semanticscholar.org/5c64/29952e08025a9649c2b0ba32518e9a7fb5c2.pdf Section 5
+		// Note: there is a bug in the paper regarding the m parameter, M=3*(x1^2)+a*(z1^4)
+		// x, y, z at this point represent the squares of _x, _y, _z
+		uint256 x = mulmod(_x, _x, _pp); //x1^2
+		uint256 y = mulmod(_y, _y, _pp); //y1^2
+		uint256 z = mulmod(_z, _z, _pp); //z1^2
+
+		// s
+		uint256 s = mulmod(4, mulmod(_x, y, _pp), _pp);
+		// m
+		uint256 m = addmod(mulmod(3, x, _pp), mulmod(_aa, mulmod(z, z, _pp), _pp), _pp);
+
+		// x, y, z at this point will be reassigned and rather represent qx, qy, qz from the paper
+		// This allows to reduce the gas cost and stack footprint of the algorithm
+		// qx
+		x = addmod(mulmod(m, m, _pp), _pp - addmod(s, s, _pp), _pp);
+		// qy = -8*y1^4 + M(S-T)
+		y = addmod(
+			mulmod(m, addmod(s, _pp - x, _pp), _pp),
+			_pp - mulmod(8, mulmod(y, y, _pp), _pp),
+			_pp
+		);
+		// qz = 2*y1*z1
+		z = mulmod(2, mulmod(_y, _z, _pp), _pp);
+
+		return (x, y, z);
+	}
+
+	// Multiply point (x, y, z) times d.
+	// return (qx, qy, qz) d*P1 in Jacobian
+	function _jacMul(
+		uint256 _d,
+		uint256 _x,
+		uint256 _y,
+		uint256 _z,
+		uint256 _aa,
+		uint256 _pp
+	)
+		internal
+		pure
+		returns (
+			uint256,
+			uint256,
+			uint256
+		)
+	{
+		// Early return in case that `_d == 0`
+		if (_d == 0) {
+			return (_x, _y, _z);
+		}
+
+		uint256 remaining = _d;
+		uint256 qx = 0;
+		uint256 qy = 0;
+		uint256 qz = 1;
+
+		// Double and add algorithm
+		while (remaining != 0) {
+			if ((remaining & 1) != 0) {
+				(qx, qy, qz) = _jacAdd(qx, qy, qz, _x, _y, _z, _pp);
+			}
+			remaining = remaining / 2;
+			(_x, _y, _z) = _jacDouble(_x, _y, _z, _aa, _pp);
+		}
+		return (qx, qy, qz);
+	}
+}
diff --git a/contracts/PriceConsumer.sol b/contracts/PriceConsumer.sol
new file mode 100644
index 0000000000000000000000000000000000000000..11d1f51a39cc790edf024de952fc7b2416243c0b
--- /dev/null
+++ b/contracts/PriceConsumer.sol
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.4;
+
+import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";
+import "./interfaces/IPriceConsumer.sol";
+
+contract PriceConsumer is IPriceConsumer {
+	/**
+	 * Network: Rinkeby
+	 * Aggregators: ETH/USD, BTC/USD, XAU/USD, XFT/USD
+	 */
+
+	enum Assets {
+		XFT,
+		USD,
+		BTC,
+		ETH,
+		XAU
+	}
+
+	uint8 internal constant _decimalmax = 18;
+
+	constructor() {}
+
+	/**
+	 * @dev Returns required input amount of the asset given an output amount of other asset.
+	 * @param exchAggr aggregator of input asset.
+	 * @param quoteAggr aggregator of output asset.
+	 * @param exchAmount output amount.
+	 * @return input amount and decimals.
+	 */
+	function exchangeAssets(
+		uint8 exchAggr,
+		uint8 quoteAggr,
+		uint256 exchAmount
+	) external view override returns (uint256, uint8) {
+		require(exchAggr != quoteAggr, "Aggregator names are the same");
+		(uint256 _quotePrice, uint8 _quoteDecimal) = getDerivedPrice(exchAggr, quoteAggr);
+
+		return (uint256(exchAmount * _quotePrice) / (uint256(10**_quoteDecimal)), _quoteDecimal);
+	}
+
+	/**
+	 * @dev Returns output amount of the asset given other asset.
+ 	 * @param baseAggr input asset agregator.
+	 * @param quoteAggr output asset agregator.
+	 * @return amount and decimals.
+	 */
+	function getDerivedPrice(uint8 baseAggr, uint8 quoteAggr)
+		public
+		view
+		returns (uint256, uint8)
+	{
+		(int256 _basePrice, uint8 _baseDecimals) = getLatestPrice(baseAggr);
+		(int256 _quotePrice, uint8 _quoteDecimals) = getLatestPrice(quoteAggr);
+
+		(_basePrice, _baseDecimals) = _scalePrice(_basePrice, _baseDecimals, _decimalmax);
+		(_quotePrice, _quoteDecimals) = _scalePrice(_quotePrice, _quoteDecimals, _decimalmax);
+
+		return (
+			uint256((_basePrice * (int256(10**uint256(_baseDecimals)))) / _quotePrice),
+			_quoteDecimals
+		);
+	}
+
+	/**
+	 * @dev Returns the latest price.
+	 * @param aggregator Token name by number in Assets enum.
+	 * @return price and decimals
+	 */
+	function getLatestPrice(uint8 aggregator) public view returns (int256, uint8) {
+		if (aggregator == uint8(Assets.USD)) {
+			return (int256(10**8), 8);
+		}
+		address _addrAggr = _getAddrAggregator(aggregator);
+		require(_addrAggr != address(0), "Adress aggregator cannot be zero.");
+		(, int256 _price, , , ) = AggregatorV3Interface(_addrAggr).latestRoundData();
+		uint8 _decimals = AggregatorV3Interface(_addrAggr).decimals();
+		return (_price, _decimals);
+	}
+
+	/**
+	 * @dev Returns the aggregator address.
+	 * @param _aggregator Token name by number in Assets enum.
+	 * @return address.
+	 */
+	function _getAddrAggregator(uint8 _aggregator) internal pure returns (address) {
+		address _addrAggregator;
+
+		if (_aggregator == uint8(Assets.BTC))
+			_addrAggregator = 0xECe365B379E1dD183B20fc5f022230C044d51404;
+
+		if (_aggregator == uint8(Assets.ETH))
+			_addrAggregator = 0x8A753747A1Fa494EC906cE90E9f37563A8AF630e;
+
+		if (_aggregator == uint8(Assets.XAU))
+			_addrAggregator = 0x81570059A0cb83888f1459Ec66Aad1Ac16730243;
+
+		if (_aggregator == uint8(Assets.XFT))
+			_addrAggregator = 0xab4a352ac35dFE83221220D967Db41ee61A0DeFa;
+
+		return _addrAggregator;
+	}
+
+	/**
+	 * @dev Convert the price to the set decimals.
+	 * @param _price Token name by number in Assets enum.
+	 * @param _priceDecimals Token name by number in Assets enum.
+	 * @param _decimals Token name by number in Assets enum.
+	 * @return price and decimals.
+	 */
+	function _scalePrice(
+		int256 _price,
+		uint8 _priceDecimals,
+		uint8 _decimals
+	) internal pure returns (int256, uint8) {
+		if (_priceDecimals < _decimals) {
+			return (_price * int256(10**uint256(_decimals - _priceDecimals)), _decimals);
+		} else if (_priceDecimals > _decimals) {
+			return (_price / int256(10**uint256(_priceDecimals - _decimals)), _priceDecimals);
+		}
+		return (_price, _priceDecimals);
+	}
+
+	/**
+	 * @dev Function for check aggregators equality.
+	 * @param _aggr Token name by number in Assets enum.
+	 * @param _name Token name by number in Assets enum.
+	 * @return result of the equality check.
+	 */
+	function _isEqualAggr(string memory _aggr, string memory _name) internal pure returns (bool) {
+		bool _isEq = bytes(_aggr).length == bytes(_name).length;
+		for (uint8 i = 0; i < bytes(_aggr).length; i++) {
+			_isEq = _isEq && (bytes(_aggr)[i] == bytes(_name)[i]);
+		}
+		return _isEq;
+	}
+}
diff --git a/contracts/RP/RangeProofMath.sol b/contracts/RP/RangeProofMath.sol
new file mode 100644
index 0000000000000000000000000000000000000000..f2f28d7754d725bdd17debd5b1ee02ba4e7c2d9a
--- /dev/null
+++ b/contracts/RP/RangeProofMath.sol
@@ -0,0 +1,248 @@
+pragma solidity =0.8.4;
+
+import "../EC/EllipticCurve.sol";
+
+contract RangeProofMath is EllipticCurve {
+	// elliptic curve point structure
+	struct PointEC {
+		uint256 x;
+		uint256 y;
+	}
+
+	// set of data to verify the range proof, where
+	// n is the number of bits in the secret
+	// m - the number of participants to generate an aggregate range proof
+	// k is the number of iterations for the compression operation
+	struct SlotCount {
+		uint256 n;
+		uint256 m; //count Vj
+		uint256 k; //count L and R
+	}
+
+	// chellenges for range proof verification
+	struct SlotChallenge {
+		uint256 y;
+		uint256 z;
+		uint256 x;
+		uint256 w;
+		uint256 delta;
+	}
+
+	// Range Proof structure
+	struct SlotRangeProof {
+		PointEC[] arrVj;
+		PointEC ecA;
+		PointEC ecS;
+		PointEC ecT1;
+		PointEC ecT2;
+		uint256 utx;
+		uint256 uttx;
+		uint256 uee;
+		PointEC[] arrLk;
+		PointEC[] arrRk;
+		uint256 ua;
+		uint256 ub;
+	}
+
+	// Point to hash function
+	function _hashPPToChallange(PointEC memory _pEC_1, PointEC memory _pEC_2)
+		internal
+		pure
+		returns (uint256)
+	{
+		return uint256(sha256(abi.encode(_pEC_1.x, _pEC_1.y, _pEC_2.x, _pEC_2.y)));
+	}
+
+	// function for calculating '_negM' opposite to '_v' modulo 'nn', where
+	// _negM + _v = 0 (mod nn)
+	function _negMod(uint256 _v) internal pure returns (uint256 _negM) {
+		_negM = mulmod(1, _v, nn);
+		_negM = nn - _negM;
+	}
+
+	// function for calculating vector arrInvYn inverse to _arrMatr modulo _mod, where
+	// [_arrMatr] = [arrInvYn] ^ (- 1) (mod _mod)
+	function _invMatrMod(uint256[] memory _arrMatr, uint256 _mod)
+		internal
+		pure
+		returns (uint256[] memory _arrInvMatr)
+	{
+		_arrInvMatr = new uint256[](_arrMatr.length);
+		for (uint8 i = 0; i < _arrMatr.length; i++) {
+			_arrInvMatr[i] = invMod(_arrMatr[i], _mod);
+		}
+	}
+
+	// '_paramSHA' - input to start generation
+	// function for generating a point on an elliptic curve
+	function _genPointEC(bytes memory _paramSHA) internal pure returns (PointEC memory _pEC) {
+		uint256 _x;
+		uint256 _y;
+		uint8 _i;
+		while (_i < 256) {
+			_x = addmod(uint256(0), uint256(sha256(abi.encodePacked(_i, _paramSHA))), pp);
+			_y = eDeriveY(2, _x);
+			if (eIsOnCurve(_x, _y) == true) {
+				_pEC.x = _x;
+				_pEC.y = _y;
+				return _pEC;
+			}
+			_i++;
+		}
+	}
+
+	// '_paramSHA' - input to start generation
+	// '_n' - vector size
+	// function for generating a vector of elliptic curve points
+	function _genMatrixECPoints(bytes memory _paramSHA, uint256 _n)
+		internal
+		pure
+		returns (PointEC[] memory _matrixECPoints)
+	{
+		_matrixECPoints = new PointEC[](_n);
+		for (uint8 i = 0; i < _n; i++) {
+			_matrixECPoints[i] = _genPointEC(abi.encodePacked(_paramSHA, i));
+			if (_matrixECPoints[i].y < uint256(pp / 2)) {
+				_matrixECPoints[i].y = pp - _matrixECPoints[i].y;
+			}
+		}
+	}
+
+	// function for checking the equality of two points of an elliptic curve
+	function _equalPointEC(PointEC memory _pEC1, PointEC memory _pEC2)
+		internal
+		pure
+		returns (bool _isEq)
+	{
+		_isEq = (_pEC1.x == _pEC2.x) && (_pEC1.y == _pEC2.y);
+	}
+
+	// function for calculation vector u, parameter for 'inner product' verification
+	function _calc_matrix_u(
+		uint256 _k,
+		PointEC[] memory _arrLk,
+		PointEC[] memory _arrRk
+	) internal pure returns (uint256[] memory _arrUk) {
+		_arrUk = new uint256[](_k);
+		for (uint8 i = 0; i < _k; i++) {
+			_arrUk[i] = mulmod(1, _hashPPToChallange(_arrLk[i], _arrRk[i]), nn);
+		}
+	}
+
+	// function for calculation delta, parameter for 'polinom tx' verification
+	function _calc_delta(SlotCount memory _count, SlotChallenge memory _challenge)
+		internal
+		pure
+		returns (uint256 _delta)
+	{
+		uint256 _n = _count.n;
+		uint256 _m = _count.m;
+
+		uint256 _y = _challenge.y;
+		uint256 _z = _challenge.z;
+
+		uint256 _v1 = 1; //y^n
+		uint256 _v2 = 1; //2^n
+
+		uint256 _spm1 = 1; // <1, y^n>
+		uint256 _spm2 = 1; // <1, 2^n>
+
+		uint256 _zz = mulmod(_z, _z, nn); //z^2 mod k
+
+		// _zz = addmod(_negMod(_zz), _z, nn); // z-z^2
+
+		// (z-z^2) * <1, y ^ n*m> === (z-z^2)* m * <1, y^n>
+		for (uint8 i = 1; i < _n; i++) {
+			_v1 = mulmod(_v1, _y, nn);
+			_spm1 = addmod(_spm1, _v1, nn); // <1, y^n>
+
+			_v2 = mulmod(_v2, 2, nn);
+			_spm2 = addmod(_spm2, _v2, nn); // <1, 2^n>
+		}
+		_delta = mulmod(mulmod(_spm1, _m, nn), addmod(_negMod(_zz), _z, nn), nn); // (z-z^2)* m * <1, y^n>
+
+		// -z^3*summ(z^j)*<1, 2^nm> == -summ(z^j) * z^3 * m * <1, 2^n>
+
+		_spm1 = 1;
+		for (uint256 j = 1; j < _m; j++) {
+			_v1 = mulmod(_v1, _z, nn); //z^j
+			_spm1 = addmod(_spm1, _v1, nn); // summ(z^j)
+		}
+		_spm1 = mulmod(mulmod(_zz, _z, nn), _spm1, nn);
+		_spm1 = mulmod(_spm1, mulmod(_spm2, _m, nn), nn);
+
+		_delta = addmod(_delta, _negMod(_spm1), nn);
+	}
+
+	// function for calculation challange y
+	function _calcChallY(PointEC memory _ecA, PointEC memory _ecS)
+		internal
+		pure
+		returns (uint256 _chall)
+	{
+		require(eIsOnCurve(_ecA.x, _ecA.y), "Argument '_ecA' is not ec point");
+		require(eIsOnCurve(_ecS.x, _ecS.y), "Argument '_ecS' is not ec point");
+		_chall = addmod(0, _hashPPToChallange(_ecA, _ecS), nn);
+	}
+
+	// function for calculation challange z
+	function _calcChallZ(
+		PointEC memory _ecA,
+		PointEC memory _ecS,
+		uint256 _y
+	) internal pure returns (uint256 _chall) {
+		_chall = addmod(0, uint256(sha256(abi.encode(_ecA.x, _ecA.y, _ecS.x, _ecS.y, _y))), nn);
+	}
+
+	// function for calculation challange x
+	function _calcChallX(PointEC memory _ecT1, PointEC memory _ecT2)
+		internal
+		pure
+		returns (uint256 _chall)
+	{
+		require(eIsOnCurve(_ecT1.x, _ecT1.y), "Argument '_ecT1' is not ec point");
+		require(eIsOnCurve(_ecT2.x, _ecT2.y), "Argument '_ecT2' is not ec point");
+		_chall = addmod(0, _hashPPToChallange(_ecT1, _ecT2), nn);
+	}
+
+	// function for calculation challange w
+	function _calcChallW(
+		uint256 _tx,
+		uint256 _ttx,
+		uint256 _ee
+	) internal pure returns (uint256 _chall) {
+		_chall = addmod(0, uint256(sha256(abi.encode(_tx, _ttx, _ee))), nn);
+	}
+
+	// function for calculation number of parameters for the SlotCount structure
+	function _calc_counters(
+		PointEC[] memory _Vj,
+		PointEC[] memory _Lk,
+		PointEC[] memory _Rk
+	) internal pure returns (SlotCount memory _count) {
+		//m- number of participants
+		_count.m = _Vj.length;
+		require(_count.m > 0, "Array Vj is empty");
+
+		_count.k = _Lk.length;
+		require(_count.k > 0, "Arrays Lk and Rk with an error");
+		require(_count.k == _Rk.length, "Rk and Lk have different sizes");
+
+		//n- length 'v' in bits or k = log2(n) => n = 2^k
+		_count.n = 2**_count.k;
+	}
+
+	// function for calculation vector with size _n from the powers of _v modulo _mod,
+	// where _v ^ i (mod _mod), i = {0, 1, _n-1}
+	function _gen_matrix_product(
+		uint8 _n,
+		uint256 _v,
+		uint256 _mod
+	) internal pure returns (uint256[] memory arrProd) {
+		arrProd = new uint256[](_n);
+		arrProd[0] = 1;
+		for (uint8 i = 1; i < _n; i++) {
+			arrProd[i] = mulmod(arrProd[i - 1], _v, _mod);
+		}
+	}
+}
diff --git a/contracts/RangeProof.sol b/contracts/RangeProof.sol
new file mode 100644
index 0000000000000000000000000000000000000000..282347d1d502d551568f97f5d5fda04036bc0c99
--- /dev/null
+++ b/contracts/RangeProof.sol
@@ -0,0 +1,393 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.4;
+
+import "./RP/RangeProofMath.sol";
+
+contract RangeProof is RangeProofMath {
+	PointEC internal ecB; //point ec B
+	PointEC internal ecBB; // point ec B'
+	uint8 internal constant n = 64; // bits amount of secret value
+	uint8 internal constant k = 6; // number of iterations for compression inner products, the dependence n = 2^k
+
+	constructor() {
+		(ecB.x, ecB.y) = (gx, gy);
+		ecBB = _genPointEC(abi.encodePacked(ecB.x, ecB.y));
+	}
+
+	/**
+	 * @dev Verify polinom tx verification.
+	 * @param rp range proof elements.
+	 * @return result of verification.
+	 */
+	function verifyPolinom(SlotRangeProof memory rp) external view returns (bool) {
+		PointEC memory _leftPart;
+		PointEC memory _rightPart;
+		PointEC memory _pEC;
+		uint256 _product;
+
+		SlotCount memory _count = _calc_counters(rp.arrVj, rp.arrLk, rp.arrRk);
+
+		SlotChallenge memory _challenge;
+		_challenge.y = _calcChallY(rp.ecA, rp.ecS);
+		_challenge.z = _calcChallZ(rp.ecA, rp.ecS, _challenge.y);
+		_challenge.x = _calcChallX(rp.ecT1, rp.ecT2);
+
+		_challenge.delta = _calc_delta(_count, _challenge);
+
+		_product = mulmod(_challenge.z, _challenge.z, nn); // z^2
+		(_rightPart.x, _rightPart.y) = eMul(_product, rp.arrVj[0].x, rp.arrVj[0].y); //z^2 * V
+		for (uint8 j = 1; j < _count.m; j++) {
+			_product = mulmod(_product, _challenge.z, nn);
+			(_pEC.x, _pEC.y) = eMul(_product, rp.arrVj[j].x, rp.arrVj[j].y); //z^(j+1)*V[j]
+			(_rightPart.x, _rightPart.y) = eAdd(_rightPart.x, _rightPart.y, _pEC.x, _pEC.y);
+		}
+		(_pEC.x, _pEC.y) = eMul(_challenge.delta, ecB.x, ecB.y); // delta*B
+		(_rightPart.x, _rightPart.y) = eAdd(_rightPart.x, _rightPart.y, _pEC.x, _pEC.y); //... + delta*B
+		(_pEC.x, _pEC.y) = eMul(_challenge.x, rp.ecT1.x, rp.ecT1.y); //x*T1
+		(_rightPart.x, _rightPart.y) = eAdd(_rightPart.x, _rightPart.y, _pEC.x, _pEC.y); // ... + x*T1
+		(_pEC.x, _pEC.y) = eMul(mulmod(_challenge.x, _challenge.x, nn), rp.ecT2.x, rp.ecT2.y); //x^2*T2
+		(_rightPart.x, _rightPart.y) = eAdd(_rightPart.x, _rightPart.y, _pEC.x, _pEC.y); //... + x^2*T2
+
+		(_leftPart.x, _leftPart.y) = ePedersenCommitment(
+			rp.utx,
+			rp.uttx,
+			ecB.x,
+			ecB.y,
+			ecBB.x,
+			ecBB.y
+		);
+
+		return _equalPointEC(_leftPart, _rightPart);
+	}
+
+	/**
+	 * @dev Generate matrix H of elliptic curve points.
+	 * @param mj stringValue.
+	 * @return ecMatrHj H(stringValue)
+	 */
+	function genMatrixH(uint8 mj) external view returns (PointEC[] memory ecMatrHj) {
+		bytes memory _paramSHA = abi.encode(ecBB.x, ecBB.y);
+		ecMatrHj = _genMatrixECPoints(abi.encodePacked(_paramSHA, mj), n);
+	}
+
+	/**
+	 * @dev Generate matrix G og elliptic curve points.
+	 * @param mj H(Lk, Rk).
+	 * @return ecMatrGj  u[j]^b(i,j).
+	 */
+	function genMatrixG(uint8 mj) external view returns (PointEC[] memory ecMatrGj) {
+		// matrix G j
+		bytes memory _paramSHA = abi.encode(ecB.x, ecB.y);
+		ecMatrGj = _genMatrixECPoints(abi.encodePacked(_paramSHA, mj), n);
+	}
+
+	/**
+	 * @dev Returns left part of IPP.
+	 * @param rp range proof elements.
+	 * @param ecGk G piint.
+	 * @param ecHHk H point
+	 * @return ecRight EC point, calculated left part of IPP.
+	 */
+	function getVerifyInnerProductLeft(
+		SlotRangeProof memory rp,
+		PointEC memory ecGk,
+		PointEC memory ecHHk
+	) external view returns (PointEC memory ecRight) {
+		// a*<s, G> + b*<1/s, H> + a*b*Q
+		PointEC memory _pEC;
+
+		(ecRight.x, ecRight.y) = eMul(rp.ua, ecGk.x, ecGk.y); // a*<s, G>
+
+		(_pEC.x, _pEC.y) = eMul(rp.ub, ecHHk.x, ecHHk.y); // b*<1/s, H'>
+
+		(ecRight.x, ecRight.y) = eAdd(ecRight.x, ecRight.y, _pEC.x, _pEC.y);
+
+		//a*b*(tx*B)
+		// (_pEC.x, _pEC.y) = eMul(_challenge.w, ecB.x, ecB.y);
+		(_pEC.x, _pEC.y) = eMul(_calcChallW(rp.utx, rp.uttx, rp.uee), ecB.x, ecB.y);
+		(_pEC.x, _pEC.y) = eMul(rp.ua, _pEC.x, _pEC.y);
+		(_pEC.x, _pEC.y) = eMul(rp.ub, _pEC.x, _pEC.y);
+
+		(ecRight.x, ecRight.y) = eAdd(ecRight.x, ecRight.y, _pEC.x, _pEC.y);
+	}
+
+	/**
+	 * @dev Calculates IPPP0 - parameter for Inner Product Right.
+	 * @param rp range proof elements.
+	 * @param baseP P piint, calculated by getBaseP function.
+	 */
+	function getIPPP0(SlotRangeProof memory rp, PointEC memory baseP)
+		external
+		view
+		returns (PointEC memory ippP0)
+	{
+		//P - e'*B' + tx*Q
+		PointEC memory _pEC;
+
+		// e'*B'
+		(_pEC.x, _pEC.y) = eMul(rp.uee, ecBB.x, ecBB.y);
+		//- e'*B'
+		(_pEC.x, _pEC.y) = eInv(_pEC.x, _pEC.y);
+
+		(ippP0.x, ippP0.y) = eAdd(baseP.x, baseP.y, _pEC.x, _pEC.y);
+
+		(_pEC.x, _pEC.y) = eMul(_calcChallW(rp.utx, rp.uttx, rp.uee), ecB.x, ecB.y); // Q = w*B
+		(_pEC.x, _pEC.y) = eMul(rp.utx, _pEC.x, _pEC.y); // tx*Q
+
+		(ippP0.x, ippP0.y) = eAdd(ippP0.x, ippP0.y, _pEC.x, _pEC.y);
+	}
+
+	/**
+	 * @dev Final Range Proof verification.
+	 * @param verPolinom polinom verification result.
+	 * @param verIPP inner product proof verification result.
+	 * @return Result of verification.
+	 */
+	function verifyRP(bool verPolinom, bool verIPP) external pure returns (bool) {
+		return verPolinom && verIPP;
+	}
+
+	/**
+	 * @dev Inner Product Prove verification.
+	 * @param leftVerIPP left part of IPP: a*<s, G> + b*<1/s, H> + a*b*Q.
+	 * @param rightVerIPP right part of IPP: P0 + <uk^2, L> + <uk^(-2), R>
+	 * @return Result of verification.
+	 */
+	function verifyIPP(PointEC memory leftVerIPP, PointEC memory rightVerIPP)
+		external
+		pure
+		returns (bool)
+	{
+		return _equalPointEC(leftVerIPP, rightVerIPP);
+	}
+
+	/**
+	 * @dev Calculate vector u, parameter for 'inner product prove' verification.
+	 * @param rp range proof elements.
+	 * @return arrUk H(Lk, Rk).
+	 */
+	function genMatrUk(SlotRangeProof memory rp) external pure returns (uint256[] memory arrUk) {
+		//uk = H(Lk, Rk)
+		arrUk = _calc_matrix_u(k, rp.arrLk, rp.arrRk);
+	}
+
+	/**
+	 * @dev Calculate vector s, parameter for 'inner product prove' verification.
+	 * @param arrUk H(Lk, Rk.
+	 * @return s u[j]^b(i,j).
+	 */
+	function genMatrS(uint256[] memory arrUk) external pure returns (uint256[] memory s) {
+		uint256 _multipl;
+		uint256 _prodMultipl;
+		s = new uint256[](n);
+		for (uint8 i = 0; i < n; i++) {
+			_prodMultipl = 1;
+			for (uint8 j = 1; j <= k; j++) {
+				//calculation matrix u[j]^b(i,j)
+				if (mulmod(1, i, 2**j) < 2**(j - 1)) {
+					//u[i]^-1
+					_multipl = invMod(arrUk[k - j], nn);
+				} else {
+					_multipl = arrUk[k - j];
+				}
+				_prodMultipl = mulmod(_prodMultipl, _multipl, nn);
+			}
+			s[i] = _prodMultipl;
+		}
+	}
+
+	/**
+	 * @dev Calculate point G.
+	 * @param s points of u[j]^b(i,j) calculation.
+	 * @param arrG array of G points.
+	 * @return ecGk <s, G>.
+	 */
+	function genGk(uint256[] memory s, PointEC[] memory arrG)
+		external
+		pure
+		returns (PointEC memory ecGk)
+	{
+		PointEC memory _pEC;
+		for (uint8 i = 0; i < n; i++) {
+			(_pEC.x, _pEC.y) = eMul(s[i], arrG[i].x, arrG[i].y);
+			(ecGk.x, ecGk.y) = eAdd(_pEC.x, _pEC.y, ecGk.x, ecGk.y);
+		}
+	}
+
+	/**
+	 * @dev Calculate point H.
+	 * @param s points of u[j]^b(i,j) calculation.
+	 * @param arrHH array of H points.
+	 * @return ecHHk <1/s, H'>.
+	 */
+	function genHHk(uint256[] memory s, PointEC[] memory arrHH)
+		external
+		pure
+		returns (PointEC memory ecHHk)
+	{
+		PointEC memory _pEC;
+		for (uint8 i = 0; i < n; i++) {
+			(_pEC.x, _pEC.y) = eMul(s[n - i - 1], arrHH[i].x, arrHH[i].y);
+			(ecHHk.x, ecHHk.y) = eAdd(ecHHk.x, ecHHk.y, _pEC.x, _pEC.y);
+		}
+	}
+
+	/**
+	 * @dev Calculate vector of 2^n.
+	 * @return arr2n [2^i], i={0, 1, ..., n-1}.
+	 */
+	function genMatr2n() external pure returns (uint256[] memory arr2n) {
+		arr2n = _gen_matrix_product(n, 2, nn);
+	}
+
+	/**
+	 * @dev Calculate vector of y^n.
+	 * @param rp range proof elements.
+	 * @return arr2n [y^i], i={0, 1, ..., n-1}.
+	 */
+	function genMatrYn(SlotRangeProof memory rp) external pure returns (uint256[] memory arr2n) {
+		arr2n = _gen_matrix_product(n, _calcChallY(rp.ecA, rp.ecS), nn);
+	}
+
+	/**
+	 * @dev Calculate inverse vector of y^n.
+	 * @param arrYn array of elements y^n.
+	 * @return arrInvYn [y]^(-1).
+	 */
+	function genInvMatrYn(uint256[] memory arrYn)
+		external
+		pure
+		returns (uint256[] memory arrInvYn)
+	{
+		arrInvYn = _invMatrMod(arrYn, nn);
+	}
+
+	/**
+	 * @dev Calculate inverse vector of y^n.
+	 * @param arrUk array of elements u - H(Lk, Rk).
+	 * @return arrUk2 inversed y^n vector.
+	 */
+	function genMatrUk2(uint256[] memory arrUk) external pure returns (uint256[] memory arrUk2) {
+		arrUk2 = new uint256[](k);
+		for (uint8 j = 0; j < k; j++) {
+			arrUk2[j] = mulmod(arrUk[j], arrUk[j], nn);
+		}
+	}
+
+	/**
+	 * @dev Calculate inverse vector of arrU2k with mod nn .
+	 * @param arrU2k array of elements u - H(Lk, Rk).
+	 * @return arrInvU2k inversed arrU2k vector.
+	 */
+	function genInvMatrUk2(uint256[] memory arrU2k)
+		external
+		pure
+		returns (uint256[] memory arrInvU2k)
+	{
+		arrInvU2k = _invMatrMod(arrU2k, nn);
+	}
+
+	/**
+	 * @dev Calculate vector H', parameter for IPP verification.
+	 * @param arrH array H points.
+	 * @param arrInvYn inversed y^n.
+	 * @return _arrHH [y^(-n)] * [H].
+	 */
+	function genMatrHprime(PointEC[] memory arrH, uint256[] memory arrInvYn)
+		external
+		pure
+		returns (PointEC[] memory _arrHH)
+	{
+		_arrHH = new PointEC[](arrH.length);
+		for (uint8 i = 0; i < arrH.length; i++) {
+			(_arrHH[i].x, _arrHH[i].y) = eMul(arrInvYn[i], arrH[i].x, arrH[i].y); // y^(-n) * H
+		}
+	}
+
+	/**
+	 * @dev Calculates point P, parameter for IPP verification.
+	 * @param rp range proof elements.
+	 * @param ecMatrG array of G points.
+	 * @param ecMatrHH array of H points.
+	 * @param arr2n array of 2^n elements.
+	 * @param arrYn array of y^n elements.
+	 * @return baseP P = A + x*S - z*<1, G> + <z*y^n + z^2*2^n, H'>.
+	 */
+	function getBaseP(
+		SlotRangeProof memory rp,
+		PointEC[] memory ecMatrG,
+		PointEC[] memory ecMatrHH,
+		uint256[] memory arr2n,
+		uint256[] memory arrYn
+	) external pure returns (PointEC memory baseP) {
+		// P = A + x*S - z*<1, G> + <z*y^n + z^2*2^n, H'>
+
+		SlotChallenge memory _challenge;
+		_challenge.y = _calcChallY(rp.ecA, rp.ecS);
+		_challenge.z = _calcChallZ(rp.ecA, rp.ecS, _challenge.y);
+		_challenge.x = _calcChallX(rp.ecT1, rp.ecT2);
+
+		uint256 _mul;
+		uint256 _z2 = mulmod(_challenge.z, _challenge.z, nn); //z^2
+		PointEC memory _pEC;
+
+		// P = A + x*S - z*<1, G> + <z*y^n + z^2*2^n, H'>
+
+		// <z*y^n + z^2*2^n, H'>
+		for (uint8 i = 0; i < ecMatrHH.length; i++) {
+			_mul = addmod(mulmod(_challenge.z, arrYn[i], nn), mulmod(_z2, arr2n[i], nn), nn); // z*y^n + z^2*2^n
+			(_pEC.x, _pEC.y) = eMul(_mul, ecMatrHH[i].x, ecMatrHH[i].y); // (z*y^n + z^2*2^n) * H'
+			(baseP.x, baseP.y) = eAdd(baseP.x, baseP.y, _pEC.x, _pEC.y);
+		}
+
+		(_pEC.x, _pEC.y) = eMul(_challenge.x, rp.ecS.x, rp.ecS.y); //x*S
+
+		(_pEC.x, _pEC.y) = eAdd(rp.ecA.x, rp.ecA.y, _pEC.x, _pEC.y); // A + x*S
+
+		(baseP.x, baseP.y) = eAdd(_pEC.x, _pEC.y, baseP.x, baseP.y); //A + x*S + <z*y^n + z^2*2^n, H'>
+
+		// - z*<1, G>
+		_pEC = ecMatrG[0];
+		for (uint8 i = 1; i < ecMatrG.length; i++) {
+			(_pEC.x, _pEC.y) = eAdd(_pEC.x, _pEC.y, ecMatrG[i].x, ecMatrG[i].y);
+		}
+		(_pEC.x, _pEC.y) = eMul(_challenge.z, _pEC.x, _pEC.y);
+		(_pEC.x, _pEC.y) = eInv(_pEC.x, _pEC.y);
+
+		(baseP.x, baseP.y) = eAdd(baseP.x, baseP.y, _pEC.x, _pEC.y); //...+ -z*<1,G>
+	}
+
+	/**
+	 * @dev Calculates point P, parameter for IPP verification.
+	 * @param rp range proof elements.
+	 * @param ecIPPP0 EC point IPPP0.
+	 * @param arrUk2 array of arrU2k.
+	 * @param arrInvUk2 array of inversed arrU2k elements.
+	 * @return x y point coordinates.
+	 */
+	function getVerifyInnerProductRight(
+		SlotRangeProof memory rp,
+		PointEC memory ecIPPP0,
+		uint256[] memory arrUk2,
+		uint256[] memory arrInvUk2
+	) external pure returns (uint256 x, uint256 y) {
+		//P0 + <uk^2, L> + <uk^(-2), R>
+		PointEC memory _ecUL;
+		PointEC memory _ecUR;
+		PointEC memory _pEC;
+		uint8 j;
+		//<uk^2, L>
+		for (j = 0; j < rp.arrLk.length; j++) {
+			(_pEC.x, _pEC.y) = eMul(arrUk2[j], rp.arrLk[j].x, rp.arrLk[j].y);
+			(_ecUL.x, _ecUL.y) = eAdd(_ecUL.x, _ecUL.y, _pEC.x, _pEC.y);
+		}
+		//<uk^(-2), R>
+		for (j = 0; j < rp.arrRk.length; j++) {
+			(_pEC.x, _pEC.y) = eMul(arrInvUk2[j], rp.arrRk[j].x, rp.arrRk[j].y);
+			(_ecUR.x, _ecUR.y) = eAdd(_ecUR.x, _ecUR.y, _pEC.x, _pEC.y);
+		}
+		(_pEC.x, _pEC.y) = eAdd(ecIPPP0.x, ecIPPP0.y, _ecUL.x, _ecUL.y);
+		(_pEC.x, _pEC.y) = eAdd(_pEC.x, _pEC.y, _ecUR.x, _ecUR.y);
+		return (_pEC.x, _pEC.y);
+	}
+}
diff --git a/contracts/SchnorrSignature.sol b/contracts/SchnorrSignature.sol
new file mode 100644
index 0000000000000000000000000000000000000000..546efe29223e8d54816593f4ada2604ac4ae515d
--- /dev/null
+++ b/contracts/SchnorrSignature.sol
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: MIT
+pragma solidity =0.8.4;
+
+import "./RP/RangeProofMath.sol";
+
+contract SchnorrSignature is RangeProofMath {
+	struct SlotSchnorrSignature {
+		string message;
+		PointEC publicKey;
+		PointEC ecR;
+		uint256 s;
+	}
+
+	/**
+	 * @dev Returns the result of schnorr signature verify..
+	 * @param message signed message.
+	 * @param publicKey public key with which message was signed.
+	 * @param ecR signature part R.
+	 * @param s signature part s.
+	 * @return verifying result.
+	 */
+	function SchnorrSignatureVerify(
+		string memory message,
+		PointEC memory publicKey,
+		PointEC memory ecR,
+		uint256 s
+	) public pure returns (bool) {
+		uint256 messageHash;
+		PointEC memory ecG;
+		PointEC memory ecLeft;
+		PointEC memory ecRight;
+
+		require(
+			eIsOnCurve(publicKey.x, publicKey.y) && eIsOnCurve(ecR.x, ecR.y),
+			"Invalid input parametrs to verify the Schnorr signature"
+		);
+
+		// c = H (X, R, m)
+		messageHash = uint256(
+			sha256(abi.encodePacked(publicKey.x, publicKey.y, ecR.x, ecR.y, message))
+		);
+		//s*G
+		ecG.x = gx;
+		ecG.y = gy;
+
+		(ecLeft.x, ecLeft.y) = eMul(s, ecG.x, ecG.y);
+		//R + c*X
+		(ecRight.x, ecRight.y) = eMul(messageHash, publicKey.x, publicKey.y);
+		(ecRight.x, ecRight.y) = eAdd(ecRight.x, ecRight.y, ecR.x, ecR.y);
+		return _equalPointEC(ecLeft, ecRight);
+	}
+}
diff --git a/contracts/interfaces/IERC20MintableBurnable.sol b/contracts/interfaces/IERC20MintableBurnable.sol
new file mode 100644
index 0000000000000000000000000000000000000000..edf89161b687266284df2d25d9411dd28c3f2d1d
--- /dev/null
+++ b/contracts/interfaces/IERC20MintableBurnable.sol
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity =0.8.4;
+
+import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
+
+/**
+ * @dev Interface of the ERC20 standard with burn and mint .
+ */
+interface IERC20MintableBurnable is IERC20 {
+    /**
+    * @dev Burns a specific amount of tokens.
+    * @param amount The amount of token to be burned.
+    */
+    function burn(uint256 amount) external;
+
+    /**
+    * @dev Function to mint tokens
+    * @param to The address that will receive the minted tokens.
+    * @param amount The amount of tokens to mint.
+    */
+    function mint(address to, uint256 amount) external;
+}
diff --git a/contracts/interfaces/IPriceConsumer.sol b/contracts/interfaces/IPriceConsumer.sol
new file mode 100644
index 0000000000000000000000000000000000000000..b003a4215a417d182812ffc7ca4442344591834f
--- /dev/null
+++ b/contracts/interfaces/IPriceConsumer.sol
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity =0.8.4;
+
+interface IPriceConsumer {
+	function exchangeAssets(
+		uint8 exchAggr,
+		uint8 quoteAggr,
+		uint256 exchAmount
+	) external view returns (uint256, uint8);
+}
diff --git a/contracts/mock/ERC20Mock.sol b/contracts/mock/ERC20Mock.sol
new file mode 100644
index 0000000000000000000000000000000000000000..0c7d51beff2695180061c49b188df3bc40bf7e6d
--- /dev/null
+++ b/contracts/mock/ERC20Mock.sol
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity =0.8.4;
+
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+
+contract ERC20Mock is ERC20 {
+  constructor(uint256 amount) ERC20("Test Token", "TT") {
+    _mint(msg.sender, amount);
+  }
+}
\ No newline at end of file
diff --git a/contracts/mock/TestERC20Mock.sol b/contracts/mock/TestERC20Mock.sol
new file mode 100644
index 0000000000000000000000000000000000000000..0c683d9b94d5b27e7bf74037fa7caf8637d51aad
--- /dev/null
+++ b/contracts/mock/TestERC20Mock.sol
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity =0.8.4;
+
+import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
+
+contract TestERC20Mock is ERC20 {
+  constructor(uint256 amount) ERC20("Test Token", "TT") {
+    _mint(msg.sender, amount);
+  }
+}
\ No newline at end of file
diff --git a/contracts/mock/Token.sol b/contracts/mock/Token.sol
new file mode 100644
index 0000000000000000000000000000000000000000..820fe443cd3b2f2b9577de876494bde3c6857e63
--- /dev/null
+++ b/contracts/mock/Token.sol
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: MIT
+
+pragma solidity =0.8.4;
+
+import "@openzeppelin/contracts/token/ERC20/presets/ERC20PresetMinterPauser.sol";
+
+contract TestERC20 is ERC20PresetMinterPauser {
+  constructor(uint256 amount) ERC20PresetMinterPauser("Test Token", "TT") {
+    _mint(msg.sender, amount);
+  }
+}
\ No newline at end of file
diff --git a/hardhat.config.js b/hardhat.config.js
new file mode 100644
index 0000000000000000000000000000000000000000..882567ce3ed05ce49376148d6f00a14f5c37ad10
--- /dev/null
+++ b/hardhat.config.js
@@ -0,0 +1,101 @@
+require ("@nomiclabs/hardhat-waffle");
+require ("hardhat-gas-reporter");
+require ("hardhat-contract-sizer");
+require ("@nomiclabs/hardhat-etherscan");
+require ("@nomiclabs/hardhat-ethers");
+require ("solidity-coverage");
+require("hardhat-gas-reporter");
+const dotenv = require('dotenv');
+
+dotenv.config();
+
+task("accounts", "Prints the list of accounts", async (taskArgs, hre) => {
+  const accounts = await hre.ethers.getSigners();
+
+  for (const account of accounts) {
+    console.log(account.address);
+  }
+});
+
+const PRIVATE_KEY = process.env.PRIVATE_KEY;
+const INFURA_PROJECT_ID = process.env.INFURA_PROJECT_ID;
+const COINMARKETCAP_API_KEY = process.env.COINMARKETCAP_API_KEY;
+const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY;
+
+module.exports = {
+  defaultNetwork: "hardhat",
+  networks: {
+    hardhat: {
+      allowUnlimitedContractSize: true,
+      gas: 30000000
+    },
+    ropsten: {
+      url: "https://ropsten.infura.io/v3/179491410de5450cb20f88593067a22c",
+      accounts: [`0x${PRIVATE_KEY}`]
+    },
+    goerli: {
+      url: "https://goerli.infura.io/v3/179491410de5450cb20f88593067a22c",
+      accounts: [`0x${PRIVATE_KEY}`]
+    },
+    // localhost: {
+    //   url: "http://127.0.0.1:8545",
+    //   allowUnlimitedContractSize: true,
+    // },
+    rinkeby: {
+      url: `https://rinkeby.infura.io/v3/${INFURA_PROJECT_ID}`,
+      accounts: [`0x${PRIVATE_KEY}`],
+      gasPrice: 45000000000,
+    },
+    // mainnet: {
+    //   url: `https://mainnet.infura.io/v3/${INFURA_PROJECT_ID}`,
+    //   accounts: [`0x${PRIVATE_KEY}`],
+    //   gasPrice: 45000000000,
+    // }
+  },
+  etherscan: {
+    // Your API key for Etherscan
+    // Obtain one at https://etherscan.io/
+    apiKey: ETHERSCAN_API_KEY
+  },
+  solidity: {
+    compilers: [
+      {
+        version: "0.8.4"
+      },
+      {
+        version: "0.6.6",
+      },
+    ],
+    settings: {
+      optimizer: {
+        enabled: true,
+        runs: 200
+      },
+      evmVersion: 'london'
+    }
+  },
+
+  mocha: {
+    timeout: 20000,
+  },
+
+  gasReporter: {
+    coinmarketcap: COINMARKETCAP_API_KEY,
+    excludeContracts: ['TestERC20Mock', 'ERC20'],
+    currency: "USD",
+    gasPrice: 100,
+    enabled: true,
+  },
+
+  etherscan: {
+    apiKey: ETHERSCAN_API_KEY,
+  },
+  
+  // contractSizer: {
+  //   alphaSort: true,
+  //   disambiguatePaths: false,
+  //   runOnCompile: true,
+  //   strict: true,
+  //   // only: [':ERC20$'],
+  // }
+};
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000000000000000000000000000000000000..a1dad1dd9bd5e418f51b1983650598dace53a4f7
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,42975 @@
+{
+  "name": "offshift-dev",
+  "version": "1.0.0",
+  "lockfileVersion": 2,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "offshift-dev",
+      "version": "1.0.0",
+      "license": "MIT",
+      "dependencies": {
+        "@chainlink/contracts": "^0.4.0",
+        "@openzeppelin/contracts": "^4.3.0",
+        "bn.js": "^5.2.0"
+      },
+      "devDependencies": {
+        "@nomiclabs/hardhat-ethers": "^2.0.0",
+        "@nomiclabs/hardhat-etherscan": "^2.1.2",
+        "@nomiclabs/hardhat-truffle5": "^2.0.0",
+        "@nomiclabs/hardhat-waffle": "^2.0.1",
+        "@nomiclabs/hardhat-web3": "^2.0.0",
+        "@types/chai": "^4.2.21",
+        "@types/chai-as-promised": "^7.1.4",
+        "@types/mocha": "^8.2.3",
+        "@types/node": "^16.6.2",
+        "bip-schnorr": "^0.6.3",
+        "chai": "^4.3.4",
+        "dotenv": "^8.6.0",
+        "elliptic-curve-solidity": "^0.2.4",
+        "eslint": "^6.8.0",
+        "eslint-config-standard": "^14.1.1",
+        "eslint-plugin-import": "^2.20.2",
+        "eslint-plugin-node": "^11.1.0",
+        "eslint-plugin-promise": "^4.2.1",
+        "eslint-plugin-standard": "^4.0.1",
+        "ethereum-waffle": "^3.2.0",
+        "ethers": "^5.4.6",
+        "hardhat": "^2.6.8",
+        "hardhat-contract-sizer": "^2.0.3",
+        "hardhat-gas-reporter": "^1.0.4",
+        "noble-secp256k1": "^1.2.9",
+        "prettier": "^2.2.1",
+        "prettier-plugin-solidity": "^1.0.0-beta.7",
+        "solhint": "^3.3.4",
+        "solhint-plugin-prettier": "0.0.5",
+        "solidity-coverage": "^0.7.16",
+        "ts-node": "^9.1.1",
+        "typescript": "^4.2.4",
+        "web3": "^1.5.2"
+      }
+    },
+    "node_modules/@babel/code-frame": {
+      "version": "7.16.7",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.16.7.tgz",
+      "integrity": "sha512-iAXqUn8IIeBTNd72xsFlgaXHkMBMt6y4HJp1tIaK465CWLT/fG1aqB7ykr95gHHmlBdGbFeWWfyB4NJJ0nmeIg==",
+      "dev": true,
+      "dependencies": {
+        "@babel/highlight": "^7.16.7"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/helper-validator-identifier": {
+      "version": "7.16.7",
+      "resolved": "https://registry.npmjs.org/@babel/helper-validator-identifier/-/helper-validator-identifier-7.16.7.tgz",
+      "integrity": "sha512-hsEnFemeiW4D08A5gUAZxLBTXpZ39P+a+DGDsHw1yxqyQ/jzFEnxf5uTEGp+3bzAbNOxU1paTgYS4ECU/IgfDw==",
+      "dev": true,
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@babel/highlight": {
+      "version": "7.16.7",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.16.7.tgz",
+      "integrity": "sha512-aKpPMfLvGO3Q97V0qhw/V2SWNWlwfJknuwAunU7wZLSfrM4xTBvg7E5opUVi1kJTBKihE38CPg4nBiqX83PWYw==",
+      "dev": true,
+      "dependencies": {
+        "@babel/helper-validator-identifier": "^7.16.7",
+        "chalk": "^2.0.0",
+        "js-tokens": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=6.9.0"
+      }
+    },
+    "node_modules/@chainlink/contracts": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/@chainlink/contracts/-/contracts-0.4.0.tgz",
+      "integrity": "sha512-yZGeCBd7d+qxfw9r/JxtPzsW2kCc6MorPRZ/tDKnaJI98H99j5P2Fosfehmcwk6wVZlz+0Bp4kS1y480nw3Zow=="
+    },
+    "node_modules/@ensdomains/ens": {
+      "version": "0.4.5",
+      "resolved": "https://registry.npmjs.org/@ensdomains/ens/-/ens-0.4.5.tgz",
+      "integrity": "sha512-JSvpj1iNMFjK6K+uVl4unqMoa9rf5jopb8cya5UGBWz23Nw8hSNT7efgUx4BTlAPAgpNlEioUfeTyQ6J9ZvTVw==",
+      "deprecated": "Please use @ensdomains/ens-contracts",
+      "dev": true,
+      "dependencies": {
+        "bluebird": "^3.5.2",
+        "eth-ens-namehash": "^2.0.8",
+        "solc": "^0.4.20",
+        "testrpc": "0.0.1",
+        "web3-utils": "^1.0.0-beta.31"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/ansi-regex": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/camelcase": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
+      "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo=",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/cliui": {
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",
+      "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
+      "dev": true,
+      "dependencies": {
+        "string-width": "^1.0.1",
+        "strip-ansi": "^3.0.1",
+        "wrap-ansi": "^2.0.0"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/fs-extra": {
+      "version": "0.30.0",
+      "resolved": "https://registry.npmjs.org/fs-extra/-/fs-extra-0.30.0.tgz",
+      "integrity": "sha1-8jP/zAjU2n1DLapEl3aYnbHfk/A=",
+      "dev": true,
+      "dependencies": {
+        "graceful-fs": "^4.1.2",
+        "jsonfile": "^2.1.0",
+        "klaw": "^1.0.0",
+        "path-is-absolute": "^1.0.0",
+        "rimraf": "^2.2.8"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/get-caller-file": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-1.0.3.tgz",
+      "integrity": "sha512-3t6rVToeoZfYSGd8YoLFR2DJkiQrIiUrGcjvFX2mDw3bn6k2OtwHN0TNCLbBO+w8qTvimhDkv+LSscbJY1vE6w==",
+      "dev": true
+    },
+    "node_modules/@ensdomains/ens/node_modules/is-fullwidth-code-point": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+      "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+      "dev": true,
+      "dependencies": {
+        "number-is-nan": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/jsonfile": {
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/jsonfile/-/jsonfile-2.4.0.tgz",
+      "integrity": "sha1-NzaitCi4e72gzIO1P6PWM6NcKug=",
+      "dev": true,
+      "optionalDependencies": {
+        "graceful-fs": "^4.1.6"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/require-from-string": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/require-from-string/-/require-from-string-1.2.1.tgz",
+      "integrity": "sha1-UpyczvJzgK3+yaL5ZbZJu+5jZBg=",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/require-main-filename": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/require-main-filename/-/require-main-filename-1.0.1.tgz",
+      "integrity": "sha1-l/cXtp1IeE9fUmpsWqj/3aBVpNE=",
+      "dev": true
+    },
+    "node_modules/@ensdomains/ens/node_modules/semver": {
+      "version": "5.7.1",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-5.7.1.tgz",
+      "integrity": "sha512-sauaDf/PZdVgrLTNYHRtpXa1iRiKcaebiKQ1BJdpQlWH2lCvexQdX55snPFyK7QzpudqbCI0qXFfOasHdyNDGQ==",
+      "dev": true,
+      "bin": {
+        "semver": "bin/semver"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/solc": {
+      "version": "0.4.26",
+      "resolved": "https://registry.npmjs.org/solc/-/solc-0.4.26.tgz",
+      "integrity": "sha512-o+c6FpkiHd+HPjmjEVpQgH7fqZ14tJpXhho+/bQXlXbliLIS/xjXb42Vxh+qQY1WCSTMQ0+a5vR9vi0MfhU6mA==",
+      "dev": true,
+      "dependencies": {
+        "fs-extra": "^0.30.0",
+        "memorystream": "^0.3.1",
+        "require-from-string": "^1.1.0",
+        "semver": "^5.3.0",
+        "yargs": "^4.7.1"
+      },
+      "bin": {
+        "solcjs": "solcjs"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/string-width": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+      "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+      "dev": true,
+      "dependencies": {
+        "code-point-at": "^1.0.0",
+        "is-fullwidth-code-point": "^1.0.0",
+        "strip-ansi": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/strip-ansi": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+      "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+      "dev": true,
+      "dependencies": {
+        "ansi-regex": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/@ensdomains/ens/node_modules/which-module": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-1.0.0.tgz",
+      "integrity": "sha1-u6Y8qGGUiZT/MHc2CJ47lgJsKk8=",
+      "dev": true
+    },
+    "node_modules/@ensdomains/ens/node_modules/wrap-ansi": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
+      "integrity": "sha1-2Pw9KE3QV5T+hJc8rs3Rz4JP3YU=",
+      "dev": true,
+      "dependencies": {
+        "string-width": "^1.0.1",
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+          "dev": true,
+          "requires": {
+            "p-locate": "^3.0.0",
+            "path-exists": "^3.0.0"
+          }
+        },
+        "p-limit": {
+          "version": "2.3.0",
+          "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+          "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
+          "dev": true,
+          "requires": {
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+          }
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+          "dev": true,
+          "requires": {
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+          }
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+          "dev": true
+        },
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+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "5.2.0",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
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+          "dev": true,
+          "requires": {
+            "ansi-regex": "^4.1.0"
+          }
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "13.1.2",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
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+      "dev": true,
+      "requires": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      },
+      "dependencies": {
+        "camelcase": {
+          "version": "5.3.1",
+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
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+          "dev": true
+        }
+      }
+    },
+    "yargs-unparser": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
+      "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
+      "dev": true,
+      "requires": {
+        "flat": "^4.1.0",
+        "lodash": "^4.17.15",
+        "yargs": "^13.3.0"
+      }
+    },
+    "yn": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q==",
+      "dev": true
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000000000000000000000000000000000000..4d1ae75e8602c30436f74115438d8d29aa10c6d0
--- /dev/null
+++ b/package.json
@@ -0,0 +1,70 @@
+{
+  "name": "offshift-dev",
+  "version": "1.0.0",
+  "description": "OffShift protocol",
+  "main": "hardhat.config",
+  "type": "commonjs",
+  "directories": {
+    "test": "test"
+  },
+  "author": "dev",
+  "license": "MIT",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "solhint": "solhint -f table contracts/**/*.sol",
+    "prettier": "prettier --write 'contracts/**/*.sol'",
+    "prettier:solidity": "prettier --write contracts/**/*.sol",
+    "lint": "prettier --list-different 'contracts/**/*.sol'",
+    "compile": "npx hardhat size-contracts && npx hardhat compile",
+    "coverage": "npx hardhat size-contracts && npx hardhat coverage --network hardhat",
+    "size": "npx hardhat size-contracts"
+  },
+  "dependencies": {
+    "@chainlink/contracts": "^0.4.0",
+    "@openzeppelin/contracts": "^4.3.0",
+    "bn.js": "^5.2.0"
+  },
+  "devDependencies": {
+    "@nomiclabs/hardhat-ethers": "^2.0.0",
+    "@nomiclabs/hardhat-etherscan": "^2.1.2",
+    "@nomiclabs/hardhat-truffle5": "^2.0.0",
+    "@nomiclabs/hardhat-waffle": "^2.0.1",
+    "@nomiclabs/hardhat-web3": "^2.0.0",
+    "@types/chai": "^4.2.21",
+    "@types/chai-as-promised": "^7.1.4",
+    "@types/mocha": "^8.2.3",
+    "@types/node": "^16.6.2",
+    "bip-schnorr": "^0.6.3",
+    "chai": "^4.3.4",
+    "dotenv": "^8.6.0",
+    "elliptic-curve-solidity": "^0.2.4",
+    "eslint": "^6.8.0",
+    "eslint-config-standard": "^14.1.1",
+    "eslint-plugin-import": "^2.20.2",
+    "eslint-plugin-node": "^11.1.0",
+    "eslint-plugin-promise": "^4.2.1",
+    "eslint-plugin-standard": "^4.0.1",
+    "ethereum-waffle": "^3.2.0",
+    "ethers": "^5.4.6",
+    "hardhat": "^2.6.8",
+    "hardhat-contract-sizer": "^2.0.3",
+    "hardhat-gas-reporter": "^1.0.4",
+    "noble-secp256k1": "^1.2.9",
+    "prettier": "^2.2.1",
+    "prettier-plugin-solidity": "^1.0.0-beta.7",
+    "solhint": "^3.3.4",
+    "solhint-plugin-prettier": "0.0.5",
+    "solidity-coverage": "^0.7.16",
+    "ts-node": "^9.1.1",
+    "typescript": "^4.2.4",
+    "web3": "^1.5.2"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/vitalii-odnovol/offshift-dev.git"
+  },
+  "bugs": {
+    "url": "https://github.com/vitalii-odnovol/offshift-dev/issues"
+  },
+  "homepage": "https://github.com/vitalii-odnovol/offshift-dev#readme"
+}
diff --git a/scripts/deploy.js b/scripts/deploy.js
new file mode 100644
index 0000000000000000000000000000000000000000..2f1a9724bcdcd8ebd23358839a67ca00bd680c7c
--- /dev/null
+++ b/scripts/deploy.js
@@ -0,0 +1,51 @@
+async function main() {
+  const [deployer] = await ethers.getSigners();
+  
+  console.log("Deploying contracts with the account:", deployer.address);
+
+  console.log("Account balance:", (await deployer.getBalance()).toString());
+
+  const PriceConsumer = await ethers.getContractFactory("PriceConsumer");
+  const priceConsumer = await PriceConsumer.deploy();
+
+  await priceConsumer.deployed()
+
+  const CommitmentCircuit = await ethers.getContractFactory("CommitmentCircuit");
+  const commitmentCircuit = await CommitmentCircuit.deploy(
+    "0x97c35747AbE05EFD38A1Fc081a42600fdfB1e2F1", // xft token address
+    priceConsumer.address  // price consumer address
+  );
+
+  await commitmentCircuit.deployed()
+
+  console.log("Price consumer address:", priceConsumer.address);
+  console.log("Commitment circuit address:", commitmentCircuit.address);
+}
+
+main()
+  .then(() => process.exit(0))
+  .catch((error) => {
+    console.error(error);
+    process.exit(1);
+  });
+// const hre = require("hardhat");
+// async function main() {
+//     const [deployer] = await hre.ethers.getSigners();
+  
+//     console.log("Deploying contracts with the account:", deployer.address);
+  
+//     // console.log("Account balance:", (await deployer.getBalance()).toString());
+//     // await hre.run('compile');
+  
+//     const PedersenCommitment = await ethers.getContractFactory("PedersenCommitment");
+//     const pedersenCommitment = await PedersenCommitment.deploy();
+  
+//     console.log("PedersenCommitment address:", pedersenCommitment.address);
+//   }
+  
+//   main()
+//     .then(() => process.exit(0))
+//     .catch((error) => {
+//       console.error(error);
+//       process.exit(1);
+//     });
diff --git a/scripts/sample-script.js b/scripts/sample-script.js
new file mode 100644
index 0000000000000000000000000000000000000000..2bdd3652b004c7daa2b253c70745059b642d080d
--- /dev/null
+++ b/scripts/sample-script.js
@@ -0,0 +1,32 @@
+// We require the Hardhat Runtime Environment explicitly here. This is optional
+// but useful for running the script in a standalone fashion through `node <script>`.
+//
+// When running the script with `npx hardhat run <script>` you'll find the Hardhat
+// Runtime Environment's members available in the global scope.
+const hre = require("hardhat");
+
+async function main() {
+  // Hardhat always runs the compile task when running scripts with its command
+  // line interface.
+  //
+  // If this script is run directly using `node` you may want to call compile
+  // manually to make sure everything is compiled
+  // await hre.run('compile');
+
+  // We get the contract to deploy
+  // const Greeter = await hre.ethers.getContractFactory("Greeter");
+  // const greeter = await Greeter.deploy("Hello, Hardhat!");
+
+  // await greeter.deployed();
+
+  // console.log("Greeter deployed to:", greeter.address);
+}
+
+// We recommend this pattern to be able to use async/await everywhere
+// and properly handle errors.
+main()
+  .then(() => process.exit(0))
+  .catch((error) => {
+    console.error(error);
+    process.exit(1);
+  });
diff --git a/test/mocha.opts b/test/mocha.opts
new file mode 100644
index 0000000000000000000000000000000000000000..31217bea4286b9e10498ab8c405713406bad4b09
--- /dev/null
+++ b/test/mocha.opts
@@ -0,0 +1,4 @@
+-r ts-node/register/transpile-only
+--timeout 50000
+--no-warnings
+test/**/*.test.{js,ts}
\ No newline at end of file
diff --git a/test/testCommitmentCircuit.js b/test/testCommitmentCircuit.js
new file mode 100644
index 0000000000000000000000000000000000000000..2ff3af450175b56ba4b7717ff2c3e2ecfef8fd3e
--- /dev/null
+++ b/test/testCommitmentCircuit.js
@@ -0,0 +1,223 @@
+const { ethers } = require('hardhat');
+const { expect } = require("chai");
+const elliptic = require('elliptic');
+const ec = new elliptic.ec('secp256k1');
+
+describe("Commitment circuit", () => {
+    let Token;
+    let token;
+    let CommitmentCircuit;
+    let commCircuit;
+
+    let owner, user, amountToDeposit, amountToWithdraw;
+
+    before(async () => {
+        [owner, user] = await ethers.getSigners();
+
+        Token = await ethers.getContractFactory("ERC20Mock");
+        token = await Token.deploy("1000000000000000000000000000");
+        await token.deployed();
+
+        CommitmentCircuit = await ethers.getContractFactory("CommitmentCircuit");
+        commCircuit = await CommitmentCircuit.deploy(token.address);
+        await commCircuit.deployed();
+
+        amountToDeposit = "5600";
+        amountToWithdraw = "600";
+
+        startComm = [
+            "80896827534506630690547520492020251026855161557744096096567524235125637166228",
+            "35340021902447857874733116252574618597035402700515652153758858212804173617786"
+        ];
+
+        outpComm = [
+            "29581854941473273780983167316696779832306506083614655401787514381088218353587",
+            "95742839520915075053972174008082682421116400817893831937435579328761440955019"
+        ];
+
+        invalidComm = [
+            "2958185494143273780983167316696779832306506083614655401787514381088218353587",
+            "95742839520915075053972174008082682421116400817893831937435579328761440955019"
+        ];
+
+        m = "message";
+        aggrPubKey = [
+            "105012878946854625478151668840096389084932252989398520013599206687016371737084",
+            "109332001306514958330197135056171475144957829515243433050908948584468608042267"
+        ];
+        aggrR = [
+            "50076431034714051257113545201217887633355089690556915100431086728944568565495",
+            "100534334696491181083477625115660637245645677532597488342701629369138874590038"
+        ];
+        s = "45407579404865038949469822443889530360183727020693714560400763628627243928653";
+
+
+
+
+        V1 = ["98643800998832776046857076726380143966566263361880217391586318011264053421760","30843346858215281404360531879074902925812742234979808917433896442383404295811"];
+
+        tx = BigNumber.from("9371693311736557046070420808013642477283069066664552120604694923213514659485");
+        ttx = BigNumber.from("108990598742026189466062582882075466735590285646786143464437267625281894984458");
+        eex = BigNumber.from("74792148165564554200880594177522147399263789016199833638055550708651561575050");
+      
+        proofA = ["101489231467176905426412005712620388827237186079457258716926808479293904602928","5030063491826264586711708197433648962429539055960251990629019837101184114477"];
+        proofS = ["89158358594918955516268084680968734550631439535649874169456239070617316920625","10134396677076491541245486946267895039359362102088588616906305081094770583418"];
+        proofT1 = ["90468154111395104676141462342169501734060298909352541356458724546732428707334","42969349149287050453272407357708113887265300867021537169319955066482568112046"];
+        proofT2 = ["75455778666603495386742030251186550595474951459854286226866232749726491145314","72204170643586634455940894385236843654723049642382994565099139609146163941338"];
+      
+        Lk = [
+          ["110556554007824383663135326600822000322928700283152952952140249969179872327532","12168221817709144516286933821836663774050482777692806860120606232649374266816"],
+          ["22113417191699744162502478916577006805237583698833746310981765030750513907022","102251838342976310148740803378402979003035229598536204761529925815246432443843"],
+          ["43041650227960287461940122965062253610440827792384078200600603423993850570606","58147020486160069739256233744084859708744854439899517248803298735574203028813"],
+          ["43719908148600252502450510119375063491452343360995185459843923775852392467849","1303894536346773904663970656050807146445352787085645054943595758657620233374"],
+          ["13075658464435400031022923973917651180469987941117974098173072376137356651143","14294314626521528617262204760400100145885357325735168177172362299004993387452"],
+          ["4907756214056687914480044309171742599057481701415680229254633758212923979606","84296401102165628884557566680636012562783227863072175128118306399086153581880"]
+        ];
+      
+        Rk = [
+          ["112333866806597390107818227364761768890195984876036982769626751730774709085843","70570887930193861449552090691067551259606146481386470092004480092389970182323"],
+          ["65742165399439694165964687909191046737257696983192170841624607686035191342264","28355701602967303700368070791177739071459911461266961794896240952013245997782"],
+          ["76025389074674600743757677261033090393019281310654711774386343996497481607231","104275909702442448125908676031471414022039428730669856018947606489500829858160"],
+          ["16631044809275143009590600546130327649008853458768308684735837847042434617295","32795676902897886470950196717225604992013313180431439666111590237261747310078"],
+          ["3735780275342750415451342023318175965128664713139897427366306191071556202048","47486959196656137198301032164907150031779561093596659647243814615328325183816"],
+          ["29849603898593932295789132886525707534660261577289725449344298237959502374020","97900797446180594473809893343135493398791964258573025797890044782568305654249"]
+        ];
+      
+        a = BigNumber.from("15499164509705287011965261363835363969379973692318739607503101931701628630670");
+        b = BigNumber.from("109354859999102280466998373663539745924157686547405163294605408503966665053124");
+      
+        let Vj = [V1];
+        let rp = [Vj, proofA, proofS, proofT1, proofT2, tx, ttx, eex, Lk, Rk, a, b];
+    });
+
+    // describe('Deposit', () => {
+    //     it("Cannot deposit if signature is invalid", async () => {
+    //         await expect(
+    //             commCircuit.deposit(amountToDeposit, startComm, aggrPubKey, aggrR, s, "not valid message", { from: owner.address })
+    //         ).to.be.revertedWith("invalid signature");
+    //     });
+
+    //     it("Should deposit commitment and transfer tokens", async () => {
+    //         await token.approve(commCircuit.address, amountToDeposit, { from: owner.address });
+
+    //         const startUserBalance = await token.balanceOf(owner.address);
+    //         const startContractBalance = await token.balanceOf(commCircuit.address);
+
+    //         const tx = await commCircuit.deposit(amountToDeposit, startComm, aggrPubKey, aggrR, s, m, { from: owner.address });
+
+    //         const userBalanceAfterDeposit = await token.balanceOf(owner.address);
+    //         const contractBalanceAfterDeposit = await token.balanceOf(commCircuit.address);
+
+    //         expect(userBalanceAfterDeposit).to.equal(startUserBalance.sub(amountToDeposit));
+    //         expect(contractBalanceAfterDeposit).to.equal(startContractBalance.add(amountToDeposit));
+
+    //         const rc = await tx.wait();
+    //         const event = rc.events.find(event => event.event === 'Deposited');
+    //         const [to, amount, commitmentId, commitment] = event.args;
+
+    //         expect(to).to.equal(owner.address);
+    //         expect(amount).to.equal(amountToDeposit);
+    //         expect(commitment.toString()).to.equal(startComm.toString());
+    //         // expect(commitmentId).to.be.within(timestampBeforeDeposit, timestampAfterDeposit);
+    //     });
+    // });
+
+    describe('Transfer commitment', () => {
+        // beforeEach(async () => {
+        //     await token.approve(commCircuit.address, amountToDeposit, { from: owner.address });
+
+        //     const tx = await commCircuit.deposit(amountToDeposit, startComm, aggrPubKey, aggrR, s, m, { from: owner.address });
+        //     const rc = await tx.wait();
+        //     const event = rc.events.find(event => event.event === 'Deposited');
+        //     [to, amount, startCommId, commitment] = event.args;
+        // });
+
+        // it("Cannot transfer if signature is invalid", async () => {
+        //     await expect(
+        //         commCircuit.transferCommitment(user.address, startCommId, outpComm, "not valid message", aggrPubKey, aggrR, s, { from: owner.address })
+        //     ).to.be.revertedWith("invalid signature");
+        // });
+
+        // it("Cannot transfer if commitments is invalid", async () => {
+        //     await expect(
+        //         commCircuit.transferCommitment(user.address, startCommId, startComm, m, aggrPubKey, aggrR, s, { from: owner.address })
+        //     ).to.be.revertedWith("invalid commitments");
+        // });
+
+        // it("Cannot transfer if commitment is already used", async () => {
+        //     await commCircuit.transferCommitment(user.address, startCommId, outpComm, m, aggrPubKey, aggrR, s, { from: owner.address });
+
+        //     await expect(
+        //         commCircuit.transferCommitment(user.address, startCommId, outpComm, m, aggrPubKey, aggrR, s, { from: owner.address })
+        //     ).to.be.revertedWith("commitment already used");
+        // });
+
+        it("Should transfer correctly", async () => {
+            tx = await commCircuit.transferCommitment([m, aggrPubKey, aggrR, s], rp, { from: owner.address }); //transfer commitment 'output' from owner to user
+
+            // const rc = await tx.wait();
+            // const event = rc.events.find(event => event.event === 'CommitmentTransferred');
+            // const [sender, recipient, senderCommitmentId, recipientCommitmentId, senderCommitment, recipientCommitment] = event.args;
+
+            // expect(sender).to.equal(owner.address);
+            // expect(recipient).to.equal(user.address);
+            // expect(senderCommitmentId).to.equal(startCommId);
+            // expect(senderCommitment.toString()).to.equal(startComm.toString());
+            // expect(recipientCommitment.toString()).to.equal(outpComm.toString());
+        });
+    });
+
+    // describe('Withdraw', () => {
+    //     beforeEach(async () => {
+    //         await token.approve(commCircuit.address, amountToDeposit, { from: owner.address });
+
+    //         const tx = await commCircuit.deposit(amountToDeposit, startComm, aggrPubKey, aggrR, s, m, { from: owner.address });
+    //         const rc = await tx.wait();
+    //         const event = rc.events.find(event => event.event === 'Deposited');
+    //         [to, amount, startCommId, commitment] = event.args;
+    //     });
+
+    //     it("Cannot withdraw if signature is invalid", async () => {
+    //         await expect(
+    //             commCircuit.withdraw(amountToWithdraw, startCommId, outpComm, aggrPubKey, aggrR, "not valid message", s, { from: owner.address })
+    //         ).to.be.revertedWith("invalid signature");
+    //     });
+
+    //     it("Cannot withdraw if commitment is already used", async () => {
+    //         await commCircuit.transferCommitment(user.address, startCommId, outpComm, m, aggrPubKey, aggrR, s, { from: owner.address });
+
+    //         await expect(
+    //             commCircuit.withdraw(amountToWithdraw, startCommId, outpComm, aggrPubKey, aggrR, m, s, { from: owner.address })
+    //         ).to.be.revertedWith("commitment already used");
+    //     });
+
+    //     it("Cannot withdraw if commitments is invalid", async () => {
+    //         await expect(
+    //             commCircuit.withdraw(amountToWithdraw, startCommId, startComm, aggrPubKey, aggrR, m, s, { from: owner.address })
+    //         ).to.be.revertedWith("invalid commitments");
+    //     });
+
+    //     it("Should withdraw correctly", async () => {
+    //         const startUserBalance = await token.balanceOf(owner.address);
+    //         const startContractBalance = await token.balanceOf(commCircuit.address);
+
+    //         tx = await commCircuit.withdraw(amountToWithdraw, startCommId, outpComm, aggrPubKey, aggrR, m, s, { from: owner.address });
+
+    //         const userBalanceAfterWithdraw = await token.balanceOf(owner.address);
+    //         const contractBalanceAfterWithdraw = await token.balanceOf(commCircuit.address);
+
+    //         expect(userBalanceAfterWithdraw).to.equal(startUserBalance.add(amountToWithdraw));
+    //         expect(contractBalanceAfterWithdraw).to.equal(startContractBalance.sub(amountToWithdraw));
+
+    //         const rc = await tx.wait();
+    //         const event = rc.events.find(event => event.event === 'Withdrawn');
+    //         const [to, amount, commitmentIdOld, commitmentIdNew, commitmentOld, commitmentNew] = event.args;
+
+    //         expect(to).to.equal(owner.address);
+    //         expect(amount).to.equal(amountToWithdraw);
+    //         expect(commitmentIdOld).to.equal(startCommId);
+    //         expect(commitmentOld.toString()).to.equal(startComm.toString());
+    //         expect(commitmentNew.toString()).to.equal(outpComm.toString());
+    //     });
+    // });
+});
\ No newline at end of file
diff --git a/test/testRangeProof.js b/test/testRangeProof.js
new file mode 100644
index 0000000000000000000000000000000000000000..b0f536a27ba8124f50a60be0bba617a2f84b74ce
--- /dev/null
+++ b/test/testRangeProof.js
@@ -0,0 +1,554 @@
+const { ethers } = require('hardhat');
+const { BigNumber, utils, constants} = require('ethers');
+
+const { expect } = require("chai");
+
+describe("Testing 'RangeProof'", () => {
+  let RangeProof;
+  let rangeProof;
+
+  const MAX_UINT256 = constants.MaxUint256;
+  const MAX_UINT64 = BigNumber.from(BigInt(2**64) - BigInt(1));
+  const pp_UINT64 = BigNumber.from("18446744073709551521");
+  const pp = BigNumber.from("115792089237316195423570985008687907853269984665640564039457584007908834671663");
+  const nn = BigNumber.from("115792089237316195423570985008687907852837564279074904382605163141518161494337");
+
+  let v = BigNumber.from(utils.randomBytes(1)); //secret v
+
+  let V1, V2, V3, V4;
+  let proofA, proofS, proofT1, proofT2  // A, S, T1, T2
+  let tx, ttx, eex; //tx, tx', e'
+  let Lk, Rk, a, b;
+  let g, h, baseP;
+  
+  V1 = ["98643800998832776046857076726380143966566263361880217391586318011264053421760","30843346858215281404360531879074902925812742234979808917433896442383404295811"];
+
+  tx = BigNumber.from("9371693311736557046070420808013642477283069066664552120604694923213514659485");
+  ttx = BigNumber.from("108990598742026189466062582882075466735590285646786143464437267625281894984458");
+  eex = BigNumber.from("74792148165564554200880594177522147399263789016199833638055550708651561575050");
+
+  proofA = ["101489231467176905426412005712620388827237186079457258716926808479293904602928","5030063491826264586711708197433648962429539055960251990629019837101184114477"];
+  proofS = ["89158358594918955516268084680968734550631439535649874169456239070617316920625","10134396677076491541245486946267895039359362102088588616906305081094770583418"];
+  proofT1 = ["90468154111395104676141462342169501734060298909352541356458724546732428707334","42969349149287050453272407357708113887265300867021537169319955066482568112046"];
+  proofT2 = ["75455778666603495386742030251186550595474951459854286226866232749726491145314","72204170643586634455940894385236843654723049642382994565099139609146163941338"];
+
+  Lk = [
+    ["110556554007824383663135326600822000322928700283152952952140249969179872327532","12168221817709144516286933821836663774050482777692806860120606232649374266816"],
+    ["22113417191699744162502478916577006805237583698833746310981765030750513907022","102251838342976310148740803378402979003035229598536204761529925815246432443843"],
+    ["43041650227960287461940122965062253610440827792384078200600603423993850570606","58147020486160069739256233744084859708744854439899517248803298735574203028813"],
+    ["43719908148600252502450510119375063491452343360995185459843923775852392467849","1303894536346773904663970656050807146445352787085645054943595758657620233374"],
+    ["13075658464435400031022923973917651180469987941117974098173072376137356651143","14294314626521528617262204760400100145885357325735168177172362299004993387452"],
+    ["4907756214056687914480044309171742599057481701415680229254633758212923979606","84296401102165628884557566680636012562783227863072175128118306399086153581880"]
+  ];
+
+  Rk = [
+    ["112333866806597390107818227364761768890195984876036982769626751730774709085843","70570887930193861449552090691067551259606146481386470092004480092389970182323"],
+    ["65742165399439694165964687909191046737257696983192170841624607686035191342264","28355701602967303700368070791177739071459911461266961794896240952013245997782"],
+    ["76025389074674600743757677261033090393019281310654711774386343996497481607231","104275909702442448125908676031471414022039428730669856018947606489500829858160"],
+    ["16631044809275143009590600546130327649008853458768308684735837847042434617295","32795676902897886470950196717225604992013313180431439666111590237261747310078"],
+    ["3735780275342750415451342023318175965128664713139897427366306191071556202048","47486959196656137198301032164907150031779561093596659647243814615328325183816"],
+    ["29849603898593932295789132886525707534660261577289725449344298237959502374020","97900797446180594473809893343135493398791964258573025797890044782568305654249"]
+  ];
+
+  a = BigNumber.from("15499164509705287011965261363835363969379973692318739607503101931701628630670");
+  b = BigNumber.from("109354859999102280466998373663539745924157686547405163294605408503966665053124");
+
+  let Vj = [V1];
+  let rp = [Vj, proofA, proofS, proofT1, proofT2, tx, ttx, eex, Lk, Rk, a, b];
+  let verifyOne, verifyTwo;
+  let timeStart;
+
+  before( async () => {
+    RangeProof = await ethers.getContractFactory("RangeProof");
+    rangeProof = await RangeProof.deploy();
+    await rangeProof.deployed();
+    timeStart = Date.now();
+    // {Vj, proofA, proofS, proofT1, proofT2, tx, ttx, eex, Lk, Rk, a, b}
+  });
+
+  it("Should be correct verification polinom tx", async () => {
+    verifyOne = await rangeProof.verifyPolinom(rp);
+    console.log("verifyOne", verifyOne);
+    expect(verifyOne).to.equal(true);
+    console.log("time passed sec.", (Date.now() - timeStart)/1000);
+  }).timeout(7000);
+
+  it("Should be correct the function of verification inner product", async () => {
+	// a*<s, G> + b*<1/s, H> + a*b*Q == P0 + <uk^2, L> + <uk^(-2), R>
+
+    console.log("works more then 5 minutes");
+    
+    console.log("---test arrUk");
+    arrUk = await rangeProof.genMatrUk(rp);
+    console.log("time passed sec.", (Date.now() - timeStart)/1000);
+
+    console.log("---test s");
+    arrS = await rangeProof.genMatrS(arrUk);
+    console.log("time passed sec.", (Date.now() - timeStart)/1000);
+    [
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670",
+      "97660947187900812737391421443638988610834164289823610492767169509255560512670"
+    ]
+
+    [
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ],
+      [
+        "57352016931285389021567855399993886521462949835015476931736269398079527876555",
+        "96136577486951362545106649791496350061564120806147866708773265087130130438752"
+      ]
+    ]
+    console.log("---test arrG");
+    arrG = await rangeProof.genMatrixG("0");
+    console.log("time passed sec.", (Date.now() - timeStart)/1000);
+
+    console.log("---test g");
+    console.log("arrS: ", arrS)
+    console.log("arrG: ", arrG)
+    g = await rangeProof.genGk(arrS, arrG, {gasLimit: 125000000});
+    console.log("time passed sec.", (Date.now() - timeStart)/1000);
+    
+    // console.log("---test arrYn");
+    // arrYn = await rangeProof.genMatrYn(rp);
+    // console.log("time passed sec.", (Date.now() - timeStart)/1000);
+    
+    // console.log("---test arrInvYn");
+    // arrInvYn = await rangeProof.genInvMatrYn(arrYn);
+    // console.log("time passed sec.", (Date.now() - timeStart)/1000);
+
+    // console.log("---test arrH");
+    // arrH = await rangeProof.genMatrixH("0"); 
+    // console.log("time passed sec.", (Date.now() - timeStart)/1000);
+
+    // console.log("---test arrHH");
+    // arrHH = await rangeProof.genMatrHprime(arrH, arrInvYn, {gasLimit: 30000000});
+    // console.log("time passed sec.", (Date.now() - timeStart)/1000);
+ 
+    // console.log("---test h");
+    // h = await rangeProof.genHHk(arrS, arrHH, {gasLimit: 30000000});
+    // console.log("time passed sec.", (Date.now() - timeStart)/1000);
+    
+    // leftVerifyTwo = await rangeProof.getVerifyInnerProductLeft(rp, g, h, {gasLimit: 30000000});
+    // console.log("---test verify IPP left part:\n", leftVerifyTwo.x, leftVerifyTwo.y );
+    // console.log("time passed sec.", (Date.now() - timeStart)/1000);
+
+    // console.log("---test arr2n");
+    // arr2n = await rangeProof.genMatr2n(); 
+    // console.log("time passed sec.", (Date.now() - timeStart)/1000);
+
+    // console.log("---test arrUk2");
+    // arrUk2 = await rangeProof.genMatrUk2(arrUk, {gasLimit: 30000000});
+    // console.log("time passed sec.", (Date.now() - timeStart)/1000);
+
+    // console.log("---test arrInvUk2");
+    // arrInvUk2 = await rangeProof.genInvMatrUk2(arrUk2, {gasLimit: 30000000});
+    // console.log("time passed sec.", (Date.now() - timeStart)/1000);
+    
+    // console.log("---test baseP");
+    // baseP = await rangeProof.getBaseP(rp, arrG, arrHH, arr2n, arrYn, {gasLimit: 30000000});
+    // console.log("time passed sec.", (Date.now() - timeStart)/1000);
+
+    // console.log("---test P0");
+    // IPPP0 = await rangeProof.getIPPP0(rp, baseP, {gasLimit: 30000000});
+    // console.log("time passed sec.", (Date.now() - timeStart)/1000);
+
+    rightVerifyTwo = await rangeProof.getVerifyInnerProductRight(rp, IPPP0, arrUk2, arrInvUk2, {gasLimit: 30000000});
+    console.log("---test verify IPP right part:\n", rightVerifyTwo.x, rightVerifyTwo.y );
+    console.log("time passed sec.", (Date.now() - timeStart)/1000);
+
+    verifyTwo = await rangeProof.verifyIPP(rightVerifyTwo, leftVerifyTwo);
+
+    console.log("verifyTwo", verifyTwo, typeof(verifyTwo) );
+    console.log("time passed sec.", (Date.now() - timeStart)/1000);
+    expect(verifyTwo).to.equal(true);
+    PrintTime(Date.now() - timeStart);
+  }).timeout(700000);
+
+  it("Should be correct the function of verification range proof /ver.1/", async () => {
+    expect(await rangeProof.verifyRP(verifyOne, verifyTwo) ).to.equal(true);
+    console.log("time passed sec.", (Date.now() - timeStart)/1000);
+   PrintTime(Date.now() - timeStart);
+  });
+
+  // it ("Should be correct full version of verification range proof /ver.2/", async () => {
+  //   console.log("start verification range proof full");
+  //   console.log("works more then 5 minutes");
+  //   timeStart = Date.now();
+
+  //   console.log("verOne_Polinom");
+  //   verOne_Polinom = await rangeProof.verifyPolinom(rp);
+  //   PrintTime(Date.now() - timeStart);
+
+  //   arrG = await rangeProof.genMatrixG("0", {gasLimit: 30000000});
+
+  //   arrYn = await rangeProof.genMatrYn(rp, {gasLimit: 30000000});
+
+  //   arrHH = await rangeProof.genMatrHprime(
+  //     await rangeProof.genMatrixH("0", {gasLimit: 30000000}), 
+  //     await rangeProof.genInvMatrYn(arrYn, {gasLimit: 30000000}), {gasLimit: 30000000});
+
+  //   arrUk = await rangeProof.genMatrUk(rp, {gasLimit: 30000000});
+    
+  //   arrUk2 = await rangeProof.genMatrUk2(arrUk, {gasLimit: 30000000});
+  //   arrS = await rangeProof.genMatrS(arrUk, {gasLimit: 30000000}); 
+  //   PrintTime(Date.now() - timeStart);
+
+  //   console.log("ecGk");
+  //   ecGk = await rangeProof.genGk(arrS, arrG, {gasLimit: 30000000});
+  //   PrintTime(Date.now() - timeStart);
+
+  //   console.log("ecHHk");
+  //   ecHHk = await rangeProof.genHHk(arrS, arrHH, {gasLimit: 30000000});
+  //   PrintTime(Date.now() - timeStart);
+
+  //   console.log("verTwo_IPP_left");
+  //   verTwo_IPP_left = await rangeProof.getVerifyInnerProductLeft(
+  //     rp, 
+  //     ecGk, 
+  //     ecHHk, {gasLimit: 30000000}
+  //   );
+  //   PrintTime(Date.now() - timeStart);
+
+  //   console.log("verTwo_IPP_right");
+  //   verTwo_IPP_right = await rangeProof.getVerifyInnerProductRight(
+  //     rp,
+  //     await rangeProof.getIPPP0(
+  //       rp, 
+  //       await rangeProof.getBaseP(rp, arrG, arrHH, await rangeProof.genMatr2n(), arrYn, {gasLimit: 30000000}), {gasLimit: 30000000}
+  //     ),
+  //     arrUk2,
+  //     await rangeProof.genInvMatrUk2(arrUk2), {gasLimit: 30000000}
+  //   );
+  //   PrintTime(Date.now() - timeStart);
+
+  //   console.log("verTwo_IPP");
+  //   verTwo_IPP = await rangeProof.verifyIPP(
+  //     verTwo_IPP_left,
+  //     verTwo_IPP_right, {gasLimit: 150000000}
+  //   );
+  //   PrintTime(Date.now() - timeStart);
+
+  //   expect( await rangeProof.verifyRP(verOne_Polinom, verTwo_IPP) ).to.equal(true);
+  //   PrintTime(Date.now() - timeStart);
+  // } ).timeout(900000);
+
+  // function PrintTime(time){
+  //   s = Math.floor(time/1000);
+  //   m = Math.floor(s/60);
+  //   s = s%60;
+  //   console.log("time passed: " + m + " min." + s + " sec.");
+  // }
+  
+});
\ No newline at end of file
diff --git a/test/testSchnorSignature.js b/test/testSchnorSignature.js
new file mode 100644
index 0000000000000000000000000000000000000000..83c22d5693d5170b623c462819a8032a8a675f41
--- /dev/null
+++ b/test/testSchnorSignature.js
@@ -0,0 +1,95 @@
+const { ethers } = require('hardhat');
+const { expect } = require("chai");
+
+const {BigNumber, utils} = require('ethers');
+const elliptic = require('elliptic');
+const ec = new elliptic.ec('secp256k1');
+const abiCoder = new utils.AbiCoder();
+
+describe ("Schnorr signature", () => {
+    let SchnorrSignature;
+    let schnorrSignature;
+
+    let p = BigNumber.from(ec.n.toString());
+    let r = BigNumber.from(utils.randomBytes(10));
+    let ecG = 
+    [
+        "55066263022277343669578718895168534326250603453777594175500187360389116729240", 
+        "32670510020758816978083085130507043184471273380659243275938904335757337482424"
+    ];
+    let key = ec.genKeyPair();
+    let ecX = [key.getPublic().x.toString(), key.getPublic().y.toString()]; //publ_key
+    let x = BigNumber.from(key.getPrivate().toString()); //priv_key
+    let m = "message";
+
+
+    before (async () => {
+        SchnorrSignature = await ethers.getContractFactory("SchnorrSignature");
+        schnorrSignature = await SchnorrSignature.deploy();
+        await schnorrSignature.deployed();
+
+    });
+
+    it("Should be valid schnorr signature with random generated parametrs.", async () => 
+    {
+        //R = r*G
+        ecR = await schnorrSignature.eMul(r.toString(), ecG[0], ecG[1]);
+        ecR = [ecR[0].toString(), ecR[1].toString()];
+
+        // c = H(X, R, m)
+        c = BigNumber.from(utils.soliditySha256  // = encodePacked
+            (
+                ["uint", "uint", "uint", "uint", "string"],
+                [ecX[0], ecX[1], ecR[0], ecR[1], m]
+            )
+        );
+
+        // s = r + c*x mod p
+        s = BigNumber.from(r).add(c.mul(x).mod(p)).mod(p);
+
+        expect(await schnorrSignature.SchnorrSignatureVerify(m, ecX, ecR, s)).to.equal(true);
+    });
+
+    it ("Should be invalid with a point not eliptic curve", async () => {
+        let ecFalse = [
+            "94550510891201125443038496712355512193683746567194802595430747803790456451800",
+            "100658497413695518730530153947607016384927173293555182183697767262819897530139"
+          ];
+
+        let strToHash = abiCoder.encode(["uint", "uint", "uint", "uint", "string"],[ecX[0], ecX[1], ecFalse[0], ecFalse[1], m]);
+        c = BigNumber.from(utils.sha256(strToHash));
+        s = r.add(c.mul(x).mod(p)).mod(p);
+        await expect(
+            schnorrSignature.SchnorrSignatureVerify(m, ecX, ecFalse, s.toString())
+        ).to.be.revertedWith("Invalid input parametrs to verify the Schnorr signature");
+
+    });
+
+    it("Should be invalid with false parametrs", async () => {
+        ecR = await schnorrSignature.eMul(r.toString(), ecG[0], ecG[1]);
+        ecR = [ecR[0].toString(), ecR[1].toString()];
+        let strToHash = abiCoder.encode(["uint", "uint", "uint", "uint", "string"],[ecX[0], ecX[1], ecR[0], ecR[1], m]);
+        c = BigNumber.from(utils.sha256(strToHash));
+        let sFalse = r.add(c.sub(x).mod(p)).mod(p);
+
+        expect(await schnorrSignature.SchnorrSignatureVerify(m, ecX, ecR, sFalse.toString())).to.equal(false);
+    });
+
+    it("Should be valid schnorr signature with client parametrs.", async () => 
+    {        
+        [m, ecX, ecR, s] = [    
+            "message",
+            [
+            "27986936006637619234751661742996901780685381967893915018229061434120181515483",
+            "70636065538896624272916187918422091966493606259112919971149037509751154464577"
+            ],
+            [
+            "74580538217015729279249478019311517768049978358848055562761510406264032602856",
+            "109508452562322270947608736702231209675885566789465297663534653691453100979389"
+            ],
+            "100046075731079052227894073046844253882820832097826080819312866318004576931689"
+        ];
+
+        expect(await schnorrSignature.SchnorrSignatureVerify(m, ecX, ecR, s)).to.equal(true);
+    });	   
+});
\ No newline at end of file
diff --git a/waffle.json b/waffle.json
new file mode 100644
index 0000000000000000000000000000000000000000..d80af49c39d49a6cb490d6905b058c75bd6eac16
--- /dev/null
+++ b/waffle.json
@@ -0,0 +1,6 @@
+{
+    "compilerType": "solcjs",
+    "compilerVersion": "0.8.3",
+    "sourceDirectory": "./contracts",
+    "outputDirectory": "./build"
+  }
\ No newline at end of file