Overview
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0 ETH
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$0.00Token Holdings
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Latest 25 from a total of 204 transactions
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Update Merkle Ro... | 18709002 | 277 days ago | IN | 0 ETH | 0.00117486 | ||||
Contribute | 18708949 | 277 days ago | IN | 0 ETH | 0.00364755 | ||||
Update Merkle Ro... | 18708919 | 277 days ago | IN | 0 ETH | 0.00108148 | ||||
Contribute | 18708867 | 277 days ago | IN | 0 ETH | 0.00442579 | ||||
Contribute | 18708866 | 277 days ago | IN | 0 ETH | 0.00382492 | ||||
Contribute | 18708815 | 277 days ago | IN | 0 ETH | 0.00457628 | ||||
Update Merkle Ro... | 18708789 | 277 days ago | IN | 0 ETH | 0.00099188 | ||||
Contribute | 18708728 | 277 days ago | IN | 0 ETH | 0.00447659 | ||||
Update Merkle Ro... | 18708677 | 277 days ago | IN | 0 ETH | 0.00109434 | ||||
Contribute | 18708529 | 277 days ago | IN | 0 ETH | 0.00424952 | ||||
Contribute | 18708510 | 277 days ago | IN | 0 ETH | 0.00506904 | ||||
Contribute | 18708495 | 277 days ago | IN | 0 ETH | 0.0044936 | ||||
Contribute | 18708436 | 277 days ago | IN | 0 ETH | 0.00322927 | ||||
Contribute | 18708425 | 277 days ago | IN | 0 ETH | 0.00376753 | ||||
Contribute | 18708423 | 277 days ago | IN | 0 ETH | 0.00303093 | ||||
Contribute | 18708419 | 277 days ago | IN | 0 ETH | 0.00359106 | ||||
Contribute | 18708415 | 277 days ago | IN | 0 ETH | 0.00365883 | ||||
Contribute | 18708411 | 277 days ago | IN | 0 ETH | 0.00388102 | ||||
Contribute | 18708401 | 277 days ago | IN | 0 ETH | 0.00291168 | ||||
Update Merkle Ro... | 18708399 | 277 days ago | IN | 0 ETH | 0.00089967 | ||||
Contribute | 18708343 | 277 days ago | IN | 0 ETH | 0.00434604 | ||||
Contribute | 18708335 | 277 days ago | IN | 0 ETH | 0.00484311 | ||||
Contribute | 18708333 | 277 days ago | IN | 0 ETH | 0.00433548 | ||||
Contribute | 18708326 | 277 days ago | IN | 0 ETH | 0.0047408 | ||||
Contribute | 18708322 | 277 days ago | IN | 0 ETH | 0.00417907 |
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Contract Name:
SAFT
Compiler Version
v0.8.16+commit.07a7930e
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity ^0.8.6; import "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol"; contract SAFT { address public owner; address public multisig; bytes32 public merkleRoot; address public usdc; mapping(address => uint) public contributed; address[] public contributors; event Contribution(address user, uint amount); constructor() { owner = msg.sender; multisig = 0x7ae230223c4803961A9F41B960cA6e31095706Ed; merkleRoot = 0x6b6e7beafa3fd8c7e295477c835467eb65f1d416dd26d2d6be5999d038fc356b; usdc = 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48; } function checkProof(address _user, bytes32[] calldata _merkleProof) public view returns(bool) { bytes32 leaf = keccak256(abi.encodePacked(_user)); bool result = MerkleProof.verify(_merkleProof, merkleRoot, leaf); return result; } function contribute(uint _amountUSDC, bytes32[] calldata _merkleProof) external { require (_amountUSDC >= 500e6, "Contribution Too Low"); require (_amountUSDC + contributed[msg.sender] <= 25000e6, "Contribution Too High"); require(checkProof(msg.sender, _merkleProof) == true, "Merkle proof does not validate"); IERC20(usdc).transferFrom(msg.sender, address(this), _amountUSDC); contributed[msg.sender] += _amountUSDC; contributors.push(msg.sender); // may be duplicate addresses emit Contribution(msg.sender, _amountUSDC); } // owner functions function updateMerkleRoot(bytes32 _whitelistRoot) external { require(msg.sender == owner, "only owner has access"); merkleRoot = _whitelistRoot; } function updateToken(address _usdc) external { require(msg.sender == owner, "only owner has access"); usdc = _usdc; } // multisig functions function updateMultisig(address _multisig) external { require(msg.sender == multisig, "only multisig has access"); multisig = _multisig; } function claimToken(IERC20 _token) external { require(msg.sender == multisig || msg.sender == owner, "only multisig and owner has access"); uint balance = _token.balanceOf(address(this)); _token.transfer(multisig, balance); } function claimETH() external { require(msg.sender == multisig || msg.sender == owner, "only multisig and owner has access"); payable(multisig).transfer(address(this).balance); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @dev Interface of the ERC20 standard as defined in the EIP. */ interface IERC20 { /** * @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); /** * @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 `to`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address to, 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 `from` to `to` 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 from, address to, uint256 amount ) external returns (bool); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (utils/cryptography/MerkleProof.sol) pragma solidity ^0.8.0; /** * @dev These functions deal with verification of Merkle Tree proofs. * * The proofs can be generated using the JavaScript library * https://github.com/miguelmota/merkletreejs[merkletreejs]. * Note: the hashing algorithm should be keccak256 and pair sorting should be enabled. * * See `test/utils/cryptography/MerkleProof.test.js` for some examples. * * WARNING: You should avoid using leaf values that are 64 bytes long prior to * hashing, or use a hash function other than keccak256 for hashing leaves. * This is because the concatenation of a sorted pair of internal nodes in * the merkle tree could be reinterpreted as a leaf value. */ 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) { return processProof(proof, leaf) == root; } /** * @dev Calldata version of {verify} * * _Available since v4.7._ */ function verifyCalldata( bytes32[] calldata proof, bytes32 root, bytes32 leaf ) internal pure returns (bool) { return processProofCalldata(proof, leaf) == root; } /** * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt * hash matches the root of the tree. When processing the proof, the pairs * of leafs & pre-images are assumed to be sorted. * * _Available since v4.4._ */ function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) { bytes32 computedHash = leaf; for (uint256 i = 0; i < proof.length; i++) { computedHash = _hashPair(computedHash, proof[i]); } return computedHash; } /** * @dev Calldata version of {processProof} * * _Available since v4.7._ */ function processProofCalldata(bytes32[] calldata proof, bytes32 leaf) internal pure returns (bytes32) { bytes32 computedHash = leaf; for (uint256 i = 0; i < proof.length; i++) { computedHash = _hashPair(computedHash, proof[i]); } return computedHash; } /** * @dev Returns true if the `leaves` can be proved to be a part of a Merkle tree defined by * `root`, according to `proof` and `proofFlags` as described in {processMultiProof}. * * _Available since v4.7._ */ function multiProofVerify( bytes32[] memory proof, bool[] memory proofFlags, bytes32 root, bytes32[] memory leaves ) internal pure returns (bool) { return processMultiProof(proof, proofFlags, leaves) == root; } /** * @dev Calldata version of {multiProofVerify} * * _Available since v4.7._ */ function multiProofVerifyCalldata( bytes32[] calldata proof, bool[] calldata proofFlags, bytes32 root, bytes32[] memory leaves ) internal pure returns (bool) { return processMultiProofCalldata(proof, proofFlags, leaves) == root; } /** * @dev Returns the root of a tree reconstructed from `leaves` and the sibling nodes in `proof`, * consuming from one or the other at each step according to the instructions given by * `proofFlags`. * * _Available since v4.7._ */ function processMultiProof( bytes32[] memory proof, bool[] memory proofFlags, bytes32[] memory leaves ) internal pure returns (bytes32 merkleRoot) { // This function rebuild the root hash by traversing the tree up from the leaves. The root is rebuilt by // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of // the merkle tree. uint256 leavesLen = leaves.length; uint256 totalHashes = proofFlags.length; // Check proof validity. require(leavesLen + proof.length - 1 == totalHashes, "MerkleProof: invalid multiproof"); // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop". bytes32[] memory hashes = new bytes32[](totalHashes); uint256 leafPos = 0; uint256 hashPos = 0; uint256 proofPos = 0; // At each step, we compute the next hash using two values: // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we // get the next hash. // - depending on the flag, either another value for the "main queue" (merging branches) or an element from the // `proof` array. for (uint256 i = 0; i < totalHashes; i++) { bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++]; bytes32 b = proofFlags[i] ? leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++] : proof[proofPos++]; hashes[i] = _hashPair(a, b); } if (totalHashes > 0) { return hashes[totalHashes - 1]; } else if (leavesLen > 0) { return leaves[0]; } else { return proof[0]; } } /** * @dev Calldata version of {processMultiProof} * * _Available since v4.7._ */ function processMultiProofCalldata( bytes32[] calldata proof, bool[] calldata proofFlags, bytes32[] memory leaves ) internal pure returns (bytes32 merkleRoot) { // This function rebuild the root hash by traversing the tree up from the leaves. The root is rebuilt by // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of // the merkle tree. uint256 leavesLen = leaves.length; uint256 totalHashes = proofFlags.length; // Check proof validity. require(leavesLen + proof.length - 1 == totalHashes, "MerkleProof: invalid multiproof"); // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop". bytes32[] memory hashes = new bytes32[](totalHashes); uint256 leafPos = 0; uint256 hashPos = 0; uint256 proofPos = 0; // At each step, we compute the next hash using two values: // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we // get the next hash. // - depending on the flag, either another value for the "main queue" (merging branches) or an element from the // `proof` array. for (uint256 i = 0; i < totalHashes; i++) { bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++]; bytes32 b = proofFlags[i] ? leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++] : proof[proofPos++]; hashes[i] = _hashPair(a, b); } if (totalHashes > 0) { return hashes[totalHashes - 1]; } else if (leavesLen > 0) { return leaves[0]; } else { return proof[0]; } } function _hashPair(bytes32 a, bytes32 b) private pure returns (bytes32) { return a < b ? _efficientHash(a, b) : _efficientHash(b, a); } function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) { /// @solidity memory-safe-assembly assembly { mstore(0x00, a) mstore(0x20, b) value := keccak256(0x00, 0x40) } } }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Contribution","type":"event"},{"inputs":[{"internalType":"address","name":"_user","type":"address"},{"internalType":"bytes32[]","name":"_merkleProof","type":"bytes32[]"}],"name":"checkProof","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"claimETH","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"_token","type":"address"}],"name":"claimToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amountUSDC","type":"uint256"},{"internalType":"bytes32[]","name":"_merkleProof","type":"bytes32[]"}],"name":"contribute","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"contributed","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"contributors","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"merkleRoot","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"multisig","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_whitelistRoot","type":"bytes32"}],"name":"updateMerkleRoot","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_multisig","type":"address"}],"name":"updateMultisig","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_usdc","type":"address"}],"name":"updateToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"usdc","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}]
Contract Creation Code
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Deployed Bytecode
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Multichain Portfolio | 26 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.