ETH Price: $3,173.40 (+3.86%)
Gas: 5 Gwei

Contract

0xC442b55A082f7D5F8d8DcDA3d0efF50f47dD0F82
 

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$0.00

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Accept Grant170523912023-04-15 12:24:35371 days ago1681561475IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0080572426.44103282
Accept Grant154414692022-08-30 16:44:19599 days ago1661877859IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0102683333.69949711
Accept Grant154414112022-08-30 16:28:32599 days ago1661876912IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0065205321.39810464
Accept Grant150779182022-07-04 19:21:22656 days ago1656962482IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0074435524.42889826
Accept Grant150256962022-06-25 21:36:46665 days ago1656193006IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0105816134.72764982
Accept Grant147235062022-05-06 12:22:13715 days ago1651839733IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0009775834.77460685
Accept Grant147235062022-05-06 12:22:13715 days ago1651839733IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0011970942.58292371
Accept Grant147235062022-05-06 12:22:13715 days ago1651839733IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0103244433.88342149
Accept Grant146810292022-04-29 19:14:52722 days ago1651259692IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0246456680.87572821
Accept Grant143849672022-03-14 13:23:33768 days ago1647264213IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0048045516.70760473
Accept Grant142826712022-02-26 16:02:32784 days ago1645891352IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0121523940.10851253
Accept Grant142805812022-02-26 8:22:04784 days ago1645863724IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0106958137.19029889
Accept Grant141954312022-02-13 3:54:50797 days ago1644724490IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.01336844.11737311
Accept Grant141927032022-02-12 17:43:23798 days ago1644687803IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0116522240.51892531
Accept Grant141894452022-02-12 5:44:28798 days ago1644644668IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0168806855.40119811
Accept Grant141846572022-02-11 12:05:56799 days ago1644581156IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0107137335.1593832
Accept Grant141717352022-02-09 11:50:21801 days ago1644407421IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.018329264.28683576
Accept Grant141665372022-02-08 16:36:37802 days ago1644338197IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0249721486.84001706
Accept Grant141658662022-02-08 14:07:28802 days ago1644329248IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0165460354.30290208
Accept Grant141642582022-02-08 8:01:21802 days ago1644307281IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0225584174.64088149
Accept Grant141639412022-02-08 6:54:05802 days ago1644303245IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0143799550
Accept Grant141637882022-02-08 6:20:52802 days ago1644301252IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.018428364.08350641
Accept Grant141623982022-02-08 1:07:05803 days ago1644282425IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0275935591.06124067
Accept Grant141592812022-02-07 13:45:38803 days ago1644241538IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0153725453.45355358
Accept Grant141578232022-02-07 8:14:48803 days ago1644221688IN
Goldfinch Protocol: Backer Merkle Distributor
0 ETH0.0162172456.39427125
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Contract Source Code Verified (Exact Match)

Contract Name:
BackerMerkleDistributor

Compiler Version
v0.6.12+commit.27d51765

Optimization Enabled:
Yes with 100 runs

Other Settings:
default evmVersion, GNU GPLv3 license
File 1 of 9 : BackerMerkleDistributor.sol
// SPDX-License-Identifier: GPL-3.0-only
pragma solidity 0.6.12;

import "./MerkleDistributor.sol";

contract BackerMerkleDistributor is MerkleDistributor {
  constructor(address communityRewards_, bytes32 merkleRoot_)
    public
    MerkleDistributor(communityRewards_, merkleRoot_)
  // solhint-disable-next-line no-empty-blocks
  {

  }
}

File 2 of 9 : IERC165.sol
pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

File 3 of 9 : IERC20.sol
pragma solidity ^0.6.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

File 4 of 9 : IERC721.sol
pragma solidity ^0.6.2;

import "../../introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of NFTs in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the NFT specified by `tokenId`.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
     * another (`to`).
     *
     *
     *
     * Requirements:
     * - `from`, `to` cannot be zero.
     * - `tokenId` must be owned by `from`.
     * - If the caller is not `from`, it must be have been allowed to move this
     * NFT by either {approve} or {setApprovalForAll}.
     */
    function safeTransferFrom(address from, address to, uint256 tokenId) external;
    /**
     * @dev Transfers a specific NFT (`tokenId`) from one account (`from`) to
     * another (`to`).
     *
     * Requirements:
     * - If the caller is not `from`, it must be approved to move this NFT by
     * either {approve} or {setApprovalForAll}.
     */
    function transferFrom(address from, address to, uint256 tokenId) external;
    function approve(address to, uint256 tokenId) external;
    function getApproved(uint256 tokenId) external view returns (address operator);

    function setApprovalForAll(address operator, bool _approved) external;
    function isApprovedForAll(address owner, address operator) external view returns (bool);


    function safeTransferFrom(address from, address to, uint256 tokenId, bytes calldata data) external;
}

File 5 of 9 : MerkleProof.sol
// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev These functions deal with verification of Merkle trees (hash trees),
 */
library MerkleProof {
    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(bytes32[] memory proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
        bytes32 computedHash = leaf;

        for (uint256 i = 0; i < proof.length; i++) {
            bytes32 proofElement = proof[i];

            if (computedHash <= proofElement) {
                // Hash(current computed hash + current element of the proof)
                computedHash = keccak256(abi.encodePacked(computedHash, proofElement));
            } else {
                // Hash(current element of the proof + current computed hash)
                computedHash = keccak256(abi.encodePacked(proofElement, computedHash));
            }
        }

        // Check if the computed hash (root) is equal to the provided root
        return computedHash == root;
    }
}

File 6 of 9 : ICommunityRewards.sol
// SPDX-License-Identifier: MIT
pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts-ethereum-package/contracts/token/ERC721/IERC721.sol";

import "../interfaces/IERC20withDec.sol";

interface ICommunityRewards is IERC721 {
  function rewardsToken() external view returns (IERC20withDec);

  function claimableRewards(uint256 tokenId) external view returns (uint256 rewards);

  function totalVestedAt(
    uint256 start,
    uint256 end,
    uint256 granted,
    uint256 cliffLength,
    uint256 vestingInterval,
    uint256 revokedAt,
    uint256 time
  ) external pure returns (uint256 rewards);

  function grant(
    address recipient,
    uint256 amount,
    uint256 vestingLength,
    uint256 cliffLength,
    uint256 vestingInterval
  ) external returns (uint256 tokenId);

  function loadRewards(uint256 rewards) external;

  function revokeGrant(uint256 tokenId) external;

  function getReward(uint256 tokenId) external;

  event RewardAdded(uint256 reward);
  event Granted(
    address indexed user,
    uint256 indexed tokenId,
    uint256 amount,
    uint256 vestingLength,
    uint256 cliffLength,
    uint256 vestingInterval
  );
  event GrantRevoked(uint256 indexed tokenId, uint256 totalUnvested);
  event RewardPaid(address indexed user, uint256 indexed tokenId, uint256 reward);
}

File 7 of 9 : IERC20withDec.sol
// SPDX-License-Identifier: MIT

pragma solidity 0.6.12;
pragma experimental ABIEncoderV2;

import "@openzeppelin/contracts-ethereum-package/contracts/token/ERC20/IERC20.sol";

/*
Only addition is the `decimals` function, which we need, and which both our Fidu and USDC use, along with most ERC20's.
*/

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20withDec is IERC20 {
  /**
   * @dev Returns the number of decimals used for the token
   */
  function decimals() external view returns (uint8);
}

File 8 of 9 : IMerkleDistributor.sol
// SPDX-License-Identifier: GPL-3.0-only
// solhint-disable-next-line max-line-length
// Adapted from https://github.com/Uniswap/merkle-distributor/blob/c3255bfa2b684594ecd562cacd7664b0f18330bf/contracts/interfaces/IMerkleDistributor.sol.
pragma solidity 0.6.12;

/// @notice Enables the granting of a CommunityRewards grant, if the grant details exist in this
/// contract's Merkle root.
interface IMerkleDistributor {
  /// @notice Returns the address of the CommunityRewards contract whose grants are distributed by this contract.
  function communityRewards() external view returns (address);

  /// @notice Returns the merkle root of the merkle tree containing grant details available to accept.
  function merkleRoot() external view returns (bytes32);

  /// @notice Returns true if the index has been marked accepted.
  function isGrantAccepted(uint256 index) external view returns (bool);

  /// @notice Causes the sender to accept the grant consisting of the given details. Reverts if
  /// the inputs (which includes who the sender is) are invalid.
  function acceptGrant(
    uint256 index,
    uint256 amount,
    uint256 vestingLength,
    uint256 cliffLength,
    uint256 vestingInterval,
    bytes32[] calldata merkleProof
  ) external;

  /// @notice This event is triggered whenever a call to #acceptGrant succeeds.
  event GrantAccepted(
    uint256 indexed tokenId,
    uint256 indexed index,
    address indexed account,
    uint256 amount,
    uint256 vestingLength,
    uint256 cliffLength,
    uint256 vestingInterval
  );
}

File 10 of 9 : MerkleDistributor.sol
// SPDX-License-Identifier: GPL-3.0-only
// solhint-disable-next-line max-line-length
// Adapted from https://github.com/Uniswap/merkle-distributor/blob/c3255bfa2b684594ecd562cacd7664b0f18330bf/contracts/MerkleDistributor.sol.
pragma solidity 0.6.12;

import "@openzeppelin/contracts/cryptography/MerkleProof.sol";

import "../interfaces/ICommunityRewards.sol";
import "../interfaces/IMerkleDistributor.sol";

contract MerkleDistributor is IMerkleDistributor {
  address public immutable override communityRewards;
  bytes32 public immutable override merkleRoot;

  // @dev This is a packed array of booleans.
  mapping(uint256 => uint256) private acceptedBitMap;

  constructor(address communityRewards_, bytes32 merkleRoot_) public {
    require(communityRewards_ != address(0), "Cannot use the null address");
    require(merkleRoot_ != 0, "Invalid merkle root provided");
    communityRewards = communityRewards_;
    merkleRoot = merkleRoot_;
  }

  function isGrantAccepted(uint256 index) public view override returns (bool) {
    uint256 acceptedWordIndex = index / 256;
    uint256 acceptedBitIndex = index % 256;
    uint256 acceptedWord = acceptedBitMap[acceptedWordIndex];
    uint256 mask = (1 << acceptedBitIndex);
    return acceptedWord & mask == mask;
  }

  function _setGrantAccepted(uint256 index) private {
    uint256 acceptedWordIndex = index / 256;
    uint256 acceptedBitIndex = index % 256;
    acceptedBitMap[acceptedWordIndex] = acceptedBitMap[acceptedWordIndex] | (1 << acceptedBitIndex);
  }

  function acceptGrant(
    uint256 index,
    uint256 amount,
    uint256 vestingLength,
    uint256 cliffLength,
    uint256 vestingInterval,
    bytes32[] calldata merkleProof
  ) external override {
    require(!isGrantAccepted(index), "Grant already accepted");

    // Verify the merkle proof.
    //
    /// @dev Per the Warning in
    /// https://github.com/ethereum/solidity/blob/v0.6.12/docs/abi-spec.rst#non-standard-packed-mode,
    /// it is important that no more than one of the arguments to `abi.encodePacked()` here be a
    /// dynamic type (see definition in
    /// https://github.com/ethereum/solidity/blob/v0.6.12/docs/abi-spec.rst#formal-specification-of-the-encoding).
    bytes32 node = keccak256(abi.encodePacked(index, msg.sender, amount, vestingLength, cliffLength, vestingInterval));
    require(MerkleProof.verify(merkleProof, merkleRoot, node), "Invalid proof");

    // Mark it accepted and perform the granting.
    _setGrantAccepted(index);
    uint256 tokenId = ICommunityRewards(communityRewards).grant(
      msg.sender,
      amount,
      vestingLength,
      cliffLength,
      vestingInterval
    );

    emit GrantAccepted(tokenId, index, msg.sender, amount, vestingLength, cliffLength, vestingInterval);
  }
}

Settings
{
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs",
    "useLiteralContent": true
  },
  "optimizer": {
    "enabled": true,
    "runs": 100
  },
  "remappings": [],
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"communityRewards_","type":"address"},{"internalType":"bytes32","name":"merkleRoot_","type":"bytes32"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"tokenId","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"index","type":"uint256"},{"indexed":true,"internalType":"address","name":"account","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"vestingLength","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"cliffLength","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"vestingInterval","type":"uint256"}],"name":"GrantAccepted","type":"event"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"vestingLength","type":"uint256"},{"internalType":"uint256","name":"cliffLength","type":"uint256"},{"internalType":"uint256","name":"vestingInterval","type":"uint256"},{"internalType":"bytes32[]","name":"merkleProof","type":"bytes32[]"}],"name":"acceptGrant","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"communityRewards","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"index","type":"uint256"}],"name":"isGrantAccepted","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"merkleRoot","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"}]

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Deployed Bytecode

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

Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

0000000000000000000000000cd73c18c085deb287257ed2307ec713e9af34603048e8086a52cb8bf3cb78cbe030918e6058a2d3c3e9a4a234ef8b4306e3e13d

-----Decoded View---------------
Arg [0] : communityRewards_ (address): 0x0Cd73c18C085dEB287257ED2307eC713e9Af3460
Arg [1] : merkleRoot_ (bytes32): 0x3048e8086a52cb8bf3cb78cbe030918e6058a2d3c3e9a4a234ef8b4306e3e13d

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 0000000000000000000000000cd73c18c085deb287257ed2307ec713e9af3460
Arg [1] : 3048e8086a52cb8bf3cb78cbe030918e6058a2d3c3e9a4a234ef8b4306e3e13d


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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.