false
false
0

Contract Address Details

0xbEfeF4749c6f2C28db14c92488ddB026e07FdE05

Contract Name
PromoVault
Creator
0xc7d98c–7f3521 at 0x95e63c–ff8883
Balance
0 CLO
Tokens
Fetching tokens...
Transactions
4 Transactions
Transfers
4 Transfers
Gas Used
272,004
Last Balance Update
18597426
Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
Contract name:
PromoVault




Optimization enabled
false
Compiler version
v0.8.19+commit.7dd6d404




EVM Version
default




Verified at
2024-09-26T15:33:47.798239Z

Contract source code

// SPDX-License-Identifier: No License (None)
pragma solidity 0.8.19;

// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: APPROVE_FAILED');
    }


    function safeTransfer(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
    }


    function safeTransferFrom(address token, address from, address to, uint value) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FROM_FAILED');
    }


    function safeTransferETH(address to, uint value) internal {
        (bool success,) = to.call{value:value}(new bytes(0));
        require(success, 'TransferHelper: ETH_TRANSFER_FAILED');
    }
}

abstract contract Ownable {
    address internal _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        _owner = msg.sender;
        emit OwnershipTransferred(address(0), msg.sender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == msg.sender, "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

contract PromoVault is Ownable {
    using TransferHelper for address;
    address public authority;   // address of authority (backend) which sign token transfer data
    mapping(address user => uint256 nonce) public nonces;   // returns nonce for specific user

    event VaultTransfer(address indexed token, address indexed from, address to, uint256 value);
    event Rescue(address _token, uint256 _amount);

/*
// to sign message on the server-side use:

var vault = new web3.eth.Contract(VaultContractABI, VaultContractAddress);
var nonce = await vault.methods.nonces(from).call();
var messageHash = web3.utils.soliditySha3(token, from, to, value, nonce, ChainId, VaultContractAddress);
var signature = web3.eth.accounts.sign(messageHash, PrivateKey);
*/
    // transfer promo tokens from vault.
    function vaultTransfer(
        address token, // token to transfer
        address from, // transfer from user's virtual account
        address to, // transfer to address
        uint256 value, // amount of tokens to transfer
        bytes memory signature
    ) external {
        bytes32 messageHash = keccak256(
            abi.encodePacked(
                token,
                from,
                to,
                value,
                nonces[from],
                block.chainid,
                address(this)
            )
        );
        messageHash = prefixed(messageHash);
        require(authority == recoverSigner(messageHash, signature), "wrong signature");
        nonces[from]++;
        token.safeTransfer(to, value);
        emit VaultTransfer(token, from, to, value);

    }

    function setAuthority(address _authority) external onlyOwner {
        require(_authority != address(0));
        authority = _authority;
    }

    function splitSignature(bytes memory sig)
        internal
        pure
        returns (
            uint8 v,
            bytes32 r,
            bytes32 s
        )
    {
        require(sig.length == 65);
        assembly {
            // first 32 bytes, after the length prefix
            r := mload(add(sig, 32))
            // second 32 bytes
            s := mload(add(sig, 64))
            // final byte (first byte of the next 32 bytes)
            v := byte(0, mload(add(sig, 96)))
        }
    }

    function recoverSigner(bytes32 message, bytes memory sig)
        internal
        pure
        returns (address)
    {
        uint8 v;
        bytes32 r;
        bytes32 s;
        (v, r, s) = splitSignature(sig);
        return ecrecover(message, v, r, s);
    }

    // Builds a prefixed hash to mimic the behavior of eth_sign.
    function prefixed(bytes32 hash) internal pure returns (bytes32) {
        return
            keccak256(
                abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)
            );
    }

    function tokenReceived(address, uint, bytes calldata) external pure returns(bytes4) {
        return this.tokenReceived.selector;
    }

    function rescueTokens(address token, uint256 amount) onlyOwner external {
        if (token == address(0)) {
            msg.sender.safeTransferETH(amount);
        } else {
            token.safeTransfer(msg.sender, amount);
        }
        emit Rescue(token, amount);
    } 
}

Contract ABI

[{"type":"event","name":"OwnershipTransferred","inputs":[{"type":"address","name":"previousOwner","internalType":"address","indexed":true},{"type":"address","name":"newOwner","internalType":"address","indexed":true}],"anonymous":false},{"type":"event","name":"Rescue","inputs":[{"type":"address","name":"_token","internalType":"address","indexed":false},{"type":"uint256","name":"_amount","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"event","name":"VaultTransfer","inputs":[{"type":"address","name":"token","internalType":"address","indexed":true},{"type":"address","name":"from","internalType":"address","indexed":true},{"type":"address","name":"to","internalType":"address","indexed":false},{"type":"uint256","name":"value","internalType":"uint256","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"authority","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"uint256","name":"nonce","internalType":"uint256"}],"name":"nonces","inputs":[{"type":"address","name":"user","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"owner","inputs":[]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"rescueTokens","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"uint256","name":"amount","internalType":"uint256"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"setAuthority","inputs":[{"type":"address","name":"_authority","internalType":"address"}]},{"type":"function","stateMutability":"pure","outputs":[{"type":"bytes4","name":"","internalType":"bytes4"}],"name":"tokenReceived","inputs":[{"type":"address","name":"","internalType":"address"},{"type":"uint256","name":"","internalType":"uint256"},{"type":"bytes","name":"","internalType":"bytes"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transferOwnership","inputs":[{"type":"address","name":"newOwner","internalType":"address"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"vaultTransfer","inputs":[{"type":"address","name":"token","internalType":"address"},{"type":"address","name":"from","internalType":"address"},{"type":"address","name":"to","internalType":"address"},{"type":"uint256","name":"value","internalType":"uint256"},{"type":"bytes","name":"signature","internalType":"bytes"}]}]

Contract Creation Code

Verify & Publish 
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