Contract Source Code (Solidity)

IDE

• Blockscan IDE
• 🤖 Code ReaderBeta
• Remix IDE

Outline

• interface KongERC20Interface
•    - function balanceOf(address who)
•    - function transfer(address to, uint256 ...
•    - function mint(uint256 mintedAmount, a ...
•    - function getMintingLimit()
• interface EllipticCurveInterface
•    - function validateSignature(bytes32 me ...
•  contract Escrow *
•    - function transferTokens(
•    - function _validateSignature(
•    - function getContractState()

More Options

• Similar
• Sol2Uml
• Submit Audit
• Compare

/**
 *Submitted for verification at Etherscan.io on 2019-10-07
*/

pragma solidity 0.5.2;

/***************
**            **
** INTERFACES **
**            **
***************/

/**
 * @title  Interface for Kong ERC20 Token Contract.
 */
interface KongERC20Interface {

  function balanceOf(address who) external view returns (uint256);
  function transfer(address to, uint256 value) external returns (bool);
  function mint(uint256 mintedAmount, address recipient) external;
  function getMintingLimit() external returns(uint256);

}

/**
 * @title Interface for EllipticCurve contract.
 */
interface EllipticCurveInterface {

    function validateSignature(bytes32 message, uint[2] calldata rs, uint[2] calldata Q) external view returns (bool);

}

/**
 * @title Kong escrow contract.
 *
 * @dev   This contract escrows Kong tokens until the timestamp specified in `unlockTime`.
 *        Afterwards, `transferTokens()` can be called to transfer the escrowed tokens to a
 *        destination address of choice. The function has to be provided with a valid SECP256R1
 *        signature of a specifically-formatted sha256 hash for the public key stored in the
 *        variables `publicKeyX` and `publicKeyY`. The signature is verified by a separately-
 *        deployed contract capable of verifying SECP256R1 signatures.
 */
contract Escrow
{

  uint256 _publicKeyX;
  uint256 _publicKeyY;
  uint256 _unlockTime;
  address _eccAddress;
  address _tokAddress;

  uint256 constant BLOCK_DELAY = 240;

  /**
   * @dev All of the variables set in the constructor are immutable.
   *
   * @param publicKeyX         X coordinate of public key.
   * @param publicKeyY         Y coordinate of public key.
   * @param eccAddress         Address of elliptic curve contract.
   * @param tokAddress         Address of Kong ERC20 contract.
   * @param unlockTime         Timestamp at which transfers become possible.
   */
  constructor(
    uint256 publicKeyX,
    uint256 publicKeyY,
    address eccAddress,
    address tokAddress,
    uint256 unlockTime
  )
    public
  {
    _publicKeyX = publicKeyX;
    _publicKeyY = publicKeyY;
    _eccAddress = eccAddress;
    _tokAddress = tokAddress;
    _unlockTime = unlockTime;
  }

  /**
   * @dev Function to transfer Kong tokens.
   *
   * @param to                 Recipient.
   * @param blockNumber        Number of the block(hash) included in the signature.
   * @param rs                 R+S value of the signature.
   */
  function transferTokens(
    address to,
    uint256 blockNumber,
    uint256[2] calldata rs
  )
    external
  {
    // Verify that timelock has expired.
    require(block.timestamp >= _unlockTime, 'Cannot unlock yet.');

    // Verify blockhash is from recent past.
    require(block.number >= blockNumber, 'Invalid block.');
    require(block.number <= blockNumber + BLOCK_DELAY, 'Outdated block.');

    // Verify signature.
    require(_validateSignature(sha256(abi.encodePacked(to, blockhash(blockNumber))), rs), 'Invalid signature.');

    // Transfer current balance from token contract to `to`.
    KongERC20Interface(_tokAddress).transfer(to, KongERC20Interface(_tokAddress).balanceOf(address(this)));
  }

  /**
   * @dev Function to validate SECP256R1 signatures.
   *
   * @param message            The hash of the signed message.
   * @param rs                 R+S value of the signature.
   */
  function _validateSignature(
    bytes32 message,
    uint256[2] memory rs
  )
    internal view returns (bool)
  {
    return EllipticCurveInterface(_eccAddress).validateSignature(message, rs, [_publicKeyX, _publicKeyY]);
  }

  /**
   * @dev Helper function to return state variables.
   */
  function getContractState() external view returns (
    uint256, uint256, address, uint256, address
  ) {
    return (_publicKeyX, _publicKeyY, _eccAddress, _unlockTime, _tokAddress);
  }

}

• No Contract Security Audit Submitted- Submit Audit Here

[{"constant":true,"inputs":[],"name":"getContractState","outputs":[{"name":"","type":"uint256"},{"name":"","type":"uint256"},{"name":"","type":"address"},{"name":"","type":"uint256"},{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"to","type":"address"},{"name":"blockNumber","type":"uint256"},{"name":"rs","type":"uint256[2]"}],"name":"transferTokens","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[{"name":"publicKeyX","type":"uint256"},{"name":"publicKeyY","type":"uint256"},{"name":"eccAddress","type":"address"},{"name":"tokAddress","type":"address"},{"name":"unlockTime","type":"uint256"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"}]

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

1302:2625:0:-;;;;8:9:-1;5:2;;;30:1;27;20:12;5:2;1302:2625:0;;;;;;;;;;;;;;;;;;;;;;;;;3731:191;;;:::i;:::-;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;2486:734;;;;;;13:3:-1;8;5:12;2:2;;;30:1;27;20:12;2:2;2486:734:0;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;:::i;:::-;;3731:191;3788:7;3797;3806;3815;3824;3852:11;;3865;;3878;;;;;;;;;;;3891;;3904;;;;;;;;;;;3844:72;;;;;;;;;;3731:191;;;;;:::o;2486:734::-;2680:11;;2661:15;:30;;2653:61;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;2793:11;2777:12;:27;;2769:54;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;1479:3;2854:11;:25;2838:12;:41;;2830:69;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;2942:76;2961:52;2985:2;2999:11;2989:22;2968:44;;;;;;;;;;;;;;;;;;;;;;;;;;;49:4:-1;39:7;30;26:21;22:32;13:7;6:49;2968:44:0;;;2961:52;;;;;;;;;;;;;36:153:-1;66:2;61:3;58:11;51:19;36:153;;;182:3;176:10;171:3;164:23;98:2;93:3;89:12;82:19;;123:2;118:3;114:12;107:19;;148:2;143:3;139:12;132:19;;36:153;;;274:1;267:3;263:2;259:12;254:3;250:22;246:30;315:4;311:9;305:3;299:10;295:26;356:4;350:3;344:10;340:21;389:7;380;377:20;372:3;365:33;3:399;;;2961:52:0;;;;;;;;;;;;;;;;;;;;8:9:-1;5:2;;;45:16;42:1;39;24:38;77:16;74:1;67:27;5:2;2961:52:0;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;2961:52:0;;;;;;;;;;;;;;;;3015:2;2942:76;;;;;;;;;;;;;;;;;;;30:3:-1;22:6;14;1:33;99:1;93:3;85:6;81:16;74:27;137:4;133:9;126:4;121:3;117:14;113:30;106:37;;169:3;161:6;157:16;147:26;;2942:76:0;;;;;:18;:76::i;:::-;2934:107;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;3131:11;;;;;;;;;;;3112:40;;;3153:2;3176:11;;;;;;;;;;;3157:41;;;3207:4;3157:56;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;8:9:-1;5:2;;;30:1;27;20:12;5:2;3157:56:0;;;;8:9:-1;5:2;;;45:16;42:1;39;24:38;77:16;74:1;67:27;5:2;3157:56:0;;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;3157:56:0;;;;;;;;;;;;;;;;3112:102;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;8:9:-1;5:2;;;30:1;27;20:12;5:2;3112:102:0;;;;8:9:-1;5:2;;;45:16;42:1;39;24:38;77:16;74:1;67:27;5:2;3112:102:0;;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;3112:102:0;;;;;;;;;;;;;;;;;2486:734;;;:::o;3424:233::-;3534:4;3580:11;;;;;;;;;;;3557:53;;;3611:7;3620:2;3557:94;;;;;;;;;3625:11;;3557:94;;;;3638:11;;3557:94;;;;;;;;;;;;;;;;;;;;;;;;;;;23:1:-1;8:100;33:3;30:1;27:10;8:100;;;99:1;94:3;90:11;84:18;80:1;75:3;71:11;64:39;52:2;49:1;45:10;40:15;;8:100;;;12:14;3557:94:0;;;;;;;;;;;;;23:1:-1;8:100;33:3;30:1;27:10;8:100;;;99:1;94:3;90:11;84:18;80:1;75:3;71:11;64:39;52:2;49:1;45:10;40:15;;8:100;;;12:14;3557:94:0;;;;;;;;;;;;;;;;;;;;;;8:9:-1;5:2;;;30:1;27;20:12;5:2;3557:94:0;;;;8:9:-1;5:2;;;45:16;42:1;39;24:38;77:16;74:1;67:27;5:2;3557:94:0;;;;;;;13:2:-1;8:3;5:11;2:2;;;29:1;26;19:12;2:2;3557:94:0;;;;;;;;;;;;;;;;3550:101;;3424:233;;;;:::o

bzzr://2d3069df31319100e8ebcb15877cc97f9e8bcf50493552dc1c33c3e4c0c23bfa