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Contract Name:
MerkleDistributor
Compiler Version
v0.6.7+commit.b8d736ae
Optimization Enabled:
Yes with 200 runs
Other Settings:
istanbul EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: UNLICENSED // Forked from: https://github.com/Uniswap/merkle-distributor pragma solidity 0.6.7; import "./openzeppelin/IERC20.sol"; import "./openzeppelin/MerkleProof.sol"; import "./interfaces/IMerkleDistributor.sol"; contract MerkleDistributor is IMerkleDistributor { // --- Auth --- mapping (address => uint) public authorizedAccounts; /** * @notice Add auth to an account * @param account Account to add auth to */ function addAuthorization(address account) virtual external isAuthorized { authorizedAccounts[account] = 1; emit AddAuthorization(account); } /** * @notice Remove auth from an account * @param account Account to remove auth from */ function removeAuthorization(address account) virtual external isAuthorized { authorizedAccounts[account] = 0; emit RemoveAuthorization(account); } /** * @notice Checks whether msg.sender can call an authed function **/ modifier isAuthorized { require(authorizedAccounts[msg.sender] == 1, "MerkleDistributorFactory/account-not-authorized"); _; } /* * @notify Checks whether an address can send tokens out of this contract */ modifier canSendTokens { require( either(authorizedAccounts[msg.sender] == 1, both(owner == msg.sender, now >= addition(deploymentTime, timelapseUntilWithdrawWindow))), "MerkleDistributorFactory/cannot-send-tokens" ); _; } // The token being distributed address public immutable override token; // The owner of this contract address public immutable override owner; // The merkle root of all addresses that get a distribution bytes32 public immutable override merkleRoot; // Timestamp when this contract was deployed uint256 public immutable override deploymentTime; // This is a packed array of booleans mapping(uint256 => uint256) private claimedBitMap; constructor(address token_, bytes32 merkleRoot_) public { authorizedAccounts[msg.sender] = 1; owner = msg.sender; token = token_; merkleRoot = merkleRoot_; deploymentTime = now; emit AddAuthorization(msg.sender); } // --- Math --- function addition(uint256 x, uint256 y) internal pure returns (uint256 z) { require((z = x + y) >= x, "MerkleDistributorFactory/add-uint-uint-overflow"); } // --- Boolean Logic --- function either(bool x, bool y) internal pure returns (bool z) { assembly{ z := or(x, y)} } function both(bool x, bool y) internal pure returns (bool z) { assembly{ z := and(x, y)} } // --- Administration --- /* * @notice Send tokens to an authorized address * @param dst The address to send tokens to * @param tokenAmount The amount of tokens to send */ function sendTokens(address dst, uint256 tokenAmount) external override canSendTokens { require(dst != address(0), "MerkleDistributorFactory/null-dst"); IERC20(token).transfer(dst, tokenAmount); emit SendTokens(dst, tokenAmount); } /* * @notice View function returning whether an address has already claimed their tokens * @param index The position of the address inside the merkle tree */ function isClaimed(uint256 index) public view override returns (bool) { uint256 claimedWordIndex = index / 256; uint256 claimedBitIndex = index % 256; uint256 claimedWord = claimedBitMap[claimedWordIndex]; uint256 mask = (1 << claimedBitIndex); return claimedWord & mask == mask; } /* * @notice Mark an address as having claimed their distribution * @param index The position of the address inside the merkle tree */ function _setClaimed(uint256 index) private { uint256 claimedWordIndex = index / 256; uint256 claimedBitIndex = index % 256; claimedBitMap[claimedWordIndex] = claimedBitMap[claimedWordIndex] | (1 << claimedBitIndex); } /* * @notice Claim your distribution * @param index The position of the address inside the merkle tree * @param account The actual address from the tree * @param amount The amount being distributed * @param merkleProof The merkle path used to prove that the address is in the tree and can claim amount tokens */ function claim(uint256 index, address account, uint256 amount, bytes32[] calldata merkleProof) external override { require(!isClaimed(index), 'MerkleDistributor/drop-already-claimed'); // Verify the merkle proof bytes32 node = keccak256(abi.encodePacked(index, account, amount)); require(MerkleProof.verify(merkleProof, merkleRoot, node), 'MerkleDistributor/invalid-proof'); // Mark it claimed and send the token _setClaimed(index); require(IERC20(token).transfer(account, amount), 'MerkleDistributor/transfer-failed'); emit Claimed(index, account, amount); } }
// SPDX-License-Identifier: MIT 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); }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @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; } }
// SPDX-License-Identifier: UNLICENSED // Forked from: https://github.com/Uniswap/merkle-distributor pragma solidity >=0.5.0; // Allows anyone to claim a token if they exist in a merkle root abstract contract IMerkleDistributor { // Time from the moment this contract is deployed and until the owner can withdraw leftover tokens uint256 public constant timelapseUntilWithdrawWindow = 90 days; // Returns the address of the token distributed by this contract function token() virtual external view returns (address); // Returns the merkle root of the merkle tree containing account balances available to claim function merkleRoot() virtual external view returns (bytes32); // Returns the timestamp when this contract was deployed function deploymentTime() virtual external view returns (uint256); // Returns the address for the owner of this contract function owner() virtual external view returns (address); // Returns true if the index has been marked claimed function isClaimed(uint256 index) virtual external view returns (bool); // Send tokens to an address without that address claiming them function sendTokens(address dst, uint256 tokenAmount) virtual external; // Claim the given amount of the token to the given address. Reverts if the inputs are invalid function claim(uint256 index, address account, uint256 amount, bytes32[] calldata merkleProof) virtual external; // This event is triggered whenever an address is added to the set of authed addresses event AddAuthorization(address account); // This event is triggered whenever an address is removed from the set of authed addresses event RemoveAuthorization(address account); // This event is triggered whenever a call to #claim succeeds event Claimed(uint256 index, address account, uint256 amount); // This event is triggered whenever some tokens are sent to an address without that address claiming them event SendTokens(address dst, uint256 tokenAmount); }
{ "remappings": [ "ds-auth/=lib/ds-token/lib/ds-stop/lib/ds-auth/src/", "ds-math/=lib/ds-token/lib/ds-math/src/", "ds-note/=lib/ds-token/lib/ds-stop/lib/ds-note/src/", "ds-stop/=lib/ds-token/lib/ds-stop/src/", "ds-test/=lib/ds-test/src/", "ds-token/=lib/ds-token/src/", "erc20/=lib/ds-token/lib/erc20/src/" ], "optimizer": { "enabled": true, "runs": 200 }, "metadata": { "useLiteralContent": false, "bytecodeHash": "ipfs" }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "evmVersion": "istanbul", "libraries": {} }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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Contract Creation Code
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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)
000000000000000000000000f467c7d5a4a9c4687ffc7986ac6ad5a4c81e14043984c8a49d682e9916096c3c849e029c8a22c12a11450d2b17869e961a446d5a
-----Decoded View---------------
Arg [0] : token_ (address): 0xf467C7d5a4A9C4687fFc7986aC6aD5A4c81E1404
Arg [1] : merkleRoot_ (bytes32): 0x3984c8a49d682e9916096c3c849e029c8a22c12a11450d2b17869e961a446d5a
-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000f467c7d5a4a9c4687ffc7986ac6ad5a4c81e1404
Arg [1] : 3984c8a49d682e9916096c3c849e029c8a22c12a11450d2b17869e961a446d5a
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Multichain Portfolio | 31 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
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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.