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Latest 25 from a total of 760 transactions
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Claim Tokens | 16605477 | 595 days ago | IN | 0 ETH | 0.0009107 |
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Contract Name:
Batcher
Compiler Version
v0.8.4+commit.c7e474f2
Optimization Enabled:
Yes with 100 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
/// SPDX-License-Identifier: GPL-3.0-or-later pragma solidity ^0.8.4; import "@openzeppelin/contracts/token/ERC20/extensions/IERC20Metadata.sol"; import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol"; import "@openzeppelin/contracts/security/ReentrancyGuard.sol"; import "./interfaces/IBatcher.sol"; import "../../interfaces/IVault.sol"; import "./EIP712.sol"; /// @title Batcher /// @author 0xAd1 /// @notice Used to batch user deposits and withdrawals until the next rebalance contract Batcher is IBatcher, EIP712, ReentrancyGuard { using SafeERC20 for IERC20; /// @notice Vault parameters for the batcher VaultInfo public vaultInfo; /// @notice Enforces signature checking on deposits bool public checkValidDepositSignature; /// @notice Creates a new Batcher strictly linked to a vault /// @param _verificationAuthority Address of the verification authority which allows users to deposit /// @param vaultAddress Address of the vault which will be used to deposit and withdraw want tokens /// @param maxAmount Maximum amount of tokens that can be deposited in the vault constructor( address _verificationAuthority, address vaultAddress, uint256 maxAmount ) { verificationAuthority = _verificationAuthority; checkValidDepositSignature = true; require(vaultAddress != address(0), "NULL_ADDRESS"); vaultInfo = VaultInfo({ vaultAddress: vaultAddress, tokenAddress: IVault(vaultAddress).wantToken(), maxAmount: maxAmount }); IERC20(vaultInfo.tokenAddress).approve(vaultAddress, type(uint256).max); } /*/////////////////////////////////////////////////////////////// USER DEPOSIT/WITHDRAWAL LOGIC //////////////////////////////////////////////////////////////*/ /// @notice Ledger to maintain addresses and their amounts to be deposited into vault mapping(address => uint256) public depositLedger; /// @notice Ledger to maintain addresses and their amounts to be withdrawn from vault mapping(address => uint256) public withdrawLedger; /// @notice Address which authorises users to deposit into Batcher address public verificationAuthority; /// @notice Amount of want tokens pending to be deposited uint256 public pendingDeposit; /// @notice Amount of LP tokens pending to be exchanged back to want token uint256 public pendingWithdrawal; /** * @notice Stores the deposits for future batching via periphery * @param amountIn Value of token to be deposited * @param signature signature verifying that depositor has enough karma and is authorized to deposit by brahma */ function depositFunds( uint256 amountIn, bytes memory signature, address recipient ) external override nonReentrant { validDeposit(recipient, signature); IERC20(vaultInfo.tokenAddress).safeTransferFrom( msg.sender, address(this), amountIn ); require( IERC20(vaultInfo.vaultAddress).totalSupply() + pendingDeposit - pendingWithdrawal + amountIn <= vaultInfo.maxAmount, "MAX_LIMIT_EXCEEDED" ); depositLedger[recipient] = depositLedger[recipient] + (amountIn); pendingDeposit = pendingDeposit + amountIn; emit DepositRequest(recipient, vaultInfo.vaultAddress, amountIn); } /** * @notice User deposits vault LP tokens to be withdrawn. Stores the deposits for future batching via periphery * @param amountIn Value of token to be deposited */ function initiateWithdrawal(uint256 amountIn) external override nonReentrant { require(depositLedger[msg.sender] == 0, "DEPOSIT_PENDING"); require(amountIn > 0, "AMOUNT_IN_ZERO"); if (amountIn > userLPTokens[msg.sender]) { IERC20(vaultInfo.vaultAddress).safeTransferFrom( msg.sender, address(this), amountIn - userLPTokens[msg.sender] ); userLPTokens[msg.sender] = 0; } else { userLPTokens[msg.sender] = userLPTokens[msg.sender] - amountIn; } withdrawLedger[msg.sender] = withdrawLedger[msg.sender] + (amountIn); pendingWithdrawal = pendingWithdrawal + amountIn; emit WithdrawRequest(msg.sender, vaultInfo.vaultAddress, amountIn); } /** * @notice Allows user to collect want token back after successfull batch withdrawal * @param amountOut Amount of token to be withdrawn */ function completeWithdrawal(uint256 amountOut, address recipient) external override nonReentrant { require(amountOut != 0, "INVALID_AMOUNTOUT"); // Will revert if not enough balance userWantTokens[recipient] = userWantTokens[recipient] - amountOut; IERC20(vaultInfo.tokenAddress).safeTransfer(recipient, amountOut); emit WithdrawComplete(recipient, vaultInfo.vaultAddress, amountOut); } /** * @notice Can be used to send LP tokens owed to the recipient * @param amount Amount of LP tokens to withdraw * @param recipient Address to receive the LP tokens */ function claimTokens(uint256 amount, address recipient) public override nonReentrant { require(userLPTokens[recipient] >= amount, "NO_FUNDS"); userLPTokens[recipient] = userLPTokens[recipient] - amount; IERC20(vaultInfo.vaultAddress).safeTransfer(recipient, amount); } /*/////////////////////////////////////////////////////////////// VAULT DEPOSIT/WITHDRAWAL LOGIC //////////////////////////////////////////////////////////////*/ /// @notice Ledger to maintain addresses and vault LP tokens which batcher owes them mapping(address => uint256) public userLPTokens; /// @notice Ledger to maintain addresses and vault want tokens which batcher owes them mapping(address => uint256) public userWantTokens; /** * @notice Performs deposits on the periphery for the supplied users in batch * @param users array of users whose deposits must be resolved */ function batchDeposit(address[] memory users) external override nonReentrant { onlyKeeper(); IVault vault = IVault(vaultInfo.vaultAddress); uint256 amountToDeposit = 0; uint256 oldLPBalance = IERC20(address(vault)).balanceOf(address(this)); // Temprorary array to hold user deposit info and check for duplicate addresses uint256[] memory depositValues = new uint256[](users.length); for (uint256 i = 0; i < users.length; i++) { // Copies deposit value from ledger to temporary array uint256 userDeposit = depositLedger[users[i]]; amountToDeposit = amountToDeposit + userDeposit; depositValues[i] = userDeposit; // deposit ledger for that address is set to zero // Incase of duplicate address sent, new deposit amount used for same user will be 0 depositLedger[users[i]] = 0; } require(amountToDeposit > 0, "NO_DEPOSITS"); uint256 lpTokensReportedByVault = vault.deposit( amountToDeposit, address(this) ); uint256 lpTokensReceived = IERC20(address(vault)).balanceOf( address(this) ) - (oldLPBalance); require( lpTokensReceived == lpTokensReportedByVault, "LP_TOKENS_MISMATCH" ); uint256 totalUsersProcessed = 0; for (uint256 i = 0; i < users.length; i++) { uint256 userAmount = depositValues[i]; // Checks if userAmount is not 0, only then proceed to allocate LP tokens if (userAmount > 0) { uint256 userShare = (userAmount * (lpTokensReceived)) / (amountToDeposit); // Allocating LP tokens to user, can be calimed by the user later by calling claimTokens userLPTokens[users[i]] = userLPTokens[users[i]] + userShare; ++totalUsersProcessed; } } pendingDeposit = pendingDeposit - amountToDeposit; emit BatchDepositSuccessful(lpTokensReceived, totalUsersProcessed); } /** * @notice Performs withdraws on the periphery for the supplied users in batch * @param users array of users whose deposits must be resolved */ function batchWithdraw(address[] memory users) external override nonReentrant { onlyKeeper(); IVault vault = IVault(vaultInfo.vaultAddress); IERC20 token = IERC20(vaultInfo.tokenAddress); uint256 amountToWithdraw = 0; uint256 oldWantBalance = token.balanceOf(address(this)); // Temprorary array to hold user withdrawal info and check for duplicate addresses uint256[] memory withdrawValues = new uint256[](users.length); for (uint256 i = 0; i < users.length; i++) { uint256 userWithdraw = withdrawLedger[users[i]]; amountToWithdraw = amountToWithdraw + userWithdraw; withdrawValues[i] = userWithdraw; // Withdrawal ledger for that address is set to zero // Incase of duplicate address sent, new withdrawal amount used for same user will be 0 withdrawLedger[users[i]] = 0; } require(amountToWithdraw > 0, "NO_WITHDRAWS"); uint256 wantTokensReportedByVault = vault.withdraw( amountToWithdraw, address(this) ); uint256 wantTokensReceived = token.balanceOf(address(this)) - (oldWantBalance); require( wantTokensReceived == wantTokensReportedByVault, "WANT_TOKENS_MISMATCH" ); uint256 totalUsersProcessed = 0; for (uint256 i = 0; i < users.length; i++) { uint256 userAmount = withdrawValues[i]; // Checks if userAmount is not 0, only then proceed to allocate want tokens if (userAmount > 0) { uint256 userShare = (userAmount * wantTokensReceived) / amountToWithdraw; // Allocating want tokens to user. Can be claimed by the user by calling completeWithdrawal userWantTokens[users[i]] = userWantTokens[users[i]] + userShare; ++totalUsersProcessed; } } pendingWithdrawal = pendingWithdrawal - amountToWithdraw; emit BatchWithdrawSuccessful(wantTokensReceived, totalUsersProcessed); } /*/////////////////////////////////////////////////////////////// INTERNAL HELPERS //////////////////////////////////////////////////////////////*/ /// @notice Helper to verify signature against verification authority /// @param signature Should be generated by verificationAuthority. Should contain msg.sender function validDeposit(address recipient, bytes memory signature) internal view { if (checkValidDepositSignature) { require( verifySignatureAgainstAuthority( recipient, signature, verificationAuthority ), "INVALID_SIGNATURE" ); } require(withdrawLedger[msg.sender] == 0, "WITHDRAW_PENDING"); } /*/////////////////////////////////////////////////////////////// MAINTAINANCE ACTIONS //////////////////////////////////////////////////////////////*/ /// @notice Function to set authority address /// @param authority New authority address function setAuthority(address authority) public { onlyGovernance(); // Logging old and new verification authority emit VerificationAuthorityUpdated(verificationAuthority, authority); verificationAuthority = authority; } /// @inheritdoc IBatcher function setVaultLimit(uint256 maxAmount) external override { onlyGovernance(); vaultInfo.maxAmount = maxAmount; } /// @notice Function to enable/disable deposit signature check function setDepositSignatureCheck(bool enabled) public { onlyGovernance(); checkValidDepositSignature = enabled; } /// @notice Function to sweep funds out in case of emergency, can only be called by governance /// @param _token Address of token to sweep function sweep(address _token) public nonReentrant { onlyGovernance(); IERC20(_token).transfer( msg.sender, IERC20(_token).balanceOf(address(this)) ); } /*/////////////////////////////////////////////////////////////// ACCESS MODIFERS //////////////////////////////////////////////////////////////*/ /// @notice Helper to get Governance address from Vault contract /// @return Governance address function governance() public view returns (address) { require(vaultInfo.vaultAddress != address(0), "NULL_ADDRESS"); return IVault(vaultInfo.vaultAddress).governance(); } /// @notice Helper to get Keeper address from Vault contract /// @return Keeper address function keeper() public view returns (address) { require(vaultInfo.vaultAddress != address(0), "NULL_ADDRESS"); return IVault(vaultInfo.vaultAddress).keeper(); } /// @notice Helper to assert msg.sender as keeper address function onlyKeeper() internal view { require(msg.sender == keeper(), "ONLY_KEEPER"); } /// @notice Helper to asset msg.sender as governance address function onlyGovernance() internal view { require(governance() == msg.sender, "ONLY_GOV"); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; /** * @dev Interface for the optional metadata functions from the ERC20 standard. * * _Available since v4.1._ */ interface IERC20Metadata is IERC20 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token. */ function symbol() external view returns (string memory); /** * @dev Returns the decimals places of the token. */ function decimals() external view returns (uint8); }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (token/ERC20/utils/SafeERC20.sol) pragma solidity ^0.8.0; import "../IERC20.sol"; import "../../../utils/Address.sol"; /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using Address for address; function safeTransfer( IERC20 token, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom( IERC20 token, address from, address to, uint256 value ) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove( IERC20 token, address spender, uint256 value ) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' require( (value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance( IERC20 token, address spender, uint256 value ) internal { uint256 newAllowance = token.allowance(address(this), spender) + value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance( IERC20 token, address spender, uint256 value ) internal { unchecked { uint256 oldAllowance = token.allowance(address(this), spender); require(oldAllowance >= value, "SafeERC20: decreased allowance below zero"); uint256 newAllowance = oldAllowance - value; _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol) pragma solidity ^0.8.0; /** * @dev Contract module that helps prevent reentrant calls to a function. * * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier * available, which can be applied to functions to make sure there are no nested * (reentrant) calls to them. * * Note that because there is a single `nonReentrant` guard, functions marked as * `nonReentrant` may not call one another. This can be worked around by making * those functions `private`, and then adding `external` `nonReentrant` entry * points to them. * * TIP: If you would like to learn more about reentrancy and alternative ways * to protect against it, check out our blog post * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul]. */ abstract contract ReentrancyGuard { // Booleans are more expensive than uint256 or any type that takes up a full // word because each write operation emits an extra SLOAD to first read the // slot's contents, replace the bits taken up by the boolean, and then write // back. This is the compiler's defense against contract upgrades and // pointer aliasing, and it cannot be disabled. // The values being non-zero value makes deployment a bit more expensive, // but in exchange the refund on every call to nonReentrant will be lower in // amount. Since refunds are capped to a percentage of the total // transaction's gas, it is best to keep them low in cases like this one, to // increase the likelihood of the full refund coming into effect. uint256 private constant _NOT_ENTERED = 1; uint256 private constant _ENTERED = 2; uint256 private _status; constructor() { _status = _NOT_ENTERED; } /** * @dev Prevents a contract from calling itself, directly or indirectly. * Calling a `nonReentrant` function from another `nonReentrant` * function is not supported. It is possible to prevent this from happening * by making the `nonReentrant` function external, and making it call a * `private` function that does the actual work. */ modifier nonReentrant() { // On the first call to nonReentrant, _notEntered will be true require(_status != _ENTERED, "ReentrancyGuard: reentrant call"); // Any calls to nonReentrant after this point will fail _status = _ENTERED; _; // By storing the original value once again, a refund is triggered (see // https://eips.ethereum.org/EIPS/eip-2200) _status = _NOT_ENTERED; } }
// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.0; /** * @title IBatcher * @notice A batcher to resolve vault deposits/withdrawals in batches * @dev Provides an interface for Batcher */ interface IBatcher { /// @notice Data structure to store vault info /// @param vaultAddress Address of the vault /// @param tokenAddress Address vault's want token /// @param maxAmount Max amount of tokens to deposit in vault /// @param currentAmount Current amount of wantTokens deposited in the vault struct VaultInfo { address vaultAddress; address tokenAddress; uint256 maxAmount; } /// @notice Deposit event /// @param sender Address of the depositor /// @param vault Address of the vault /// @param amountIn Tokens deposited event DepositRequest( address indexed sender, address indexed vault, uint256 amountIn ); /// @notice Withdraw initiate event /// @param sender Address of the withdawer /// @param vault Address of the vault /// @param amountOut Tokens deposited event WithdrawRequest( address indexed sender, address indexed vault, uint256 amountOut ); /// @notice Batch Deposit event /// @param amountIn Tokens deposited /// @param totalUsers Total number of users in the batch event BatchDepositSuccessful(uint256 amountIn, uint256 totalUsers); /// @notice Batch Withdraw event /// @param amountOut Tokens withdrawn /// @param totalUsers Total number of users in the batch event BatchWithdrawSuccessful(uint256 amountOut, uint256 totalUsers); /// @notice Withdraw complete event /// @param sender Address of the withdawer /// @param vault Address of the vault /// @param amountOut Tokens deposited event WithdrawComplete( address indexed sender, address indexed vault, uint256 amountOut ); /// @notice Verification authority update event /// @param oldVerificationAuthority address of old verification authority /// @param newVerificationAuthority address of new verification authority event VerificationAuthorityUpdated( address indexed oldVerificationAuthority, address indexed newVerificationAuthority ); function depositFunds(uint256 amountIn, bytes memory signature, address recipient) external; function claimTokens(uint256 amount, address recipient) external; function initiateWithdrawal(uint256 amountIn) external; function completeWithdrawal(uint256 amountOut, address recipient) external; function batchDeposit(address[] memory users) external; function batchWithdraw(address[] memory users) external; function setVaultLimit(uint256 maxLimit) external; }
/// SPDX-License-Identifier: GPL-3.0-or-later pragma solidity ^0.8.0; interface IVault { function keeper() external view returns (address); function governance() external view returns (address); function wantToken() external view returns (address); function deposit(uint256 amountIn, address receiver) external returns (uint256 shares); function withdraw(uint256 sharesIn, address receiver) external returns (uint256 amountOut); }
// SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol"; /// @title EIP712 /// @author 0xAd1 /// @notice Used to verify signatures contract EIP712 { /// @notice Verifies a signature against alleged signer of the signature /// @param signature Signature to verify /// @param authority Signer of the signature /// @return True if the signature is signed by authority function verifySignatureAgainstAuthority( address recipient, bytes memory signature, address authority ) internal view returns (bool) { bytes32 eip712DomainHash = keccak256( abi.encode( keccak256( "EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)" ), keccak256(bytes("Batcher")), keccak256(bytes("1")), 1, address(this) ) ); bytes32 hashStruct = keccak256( abi.encode(keccak256("deposit(address owner)"), recipient) ); bytes32 hash = keccak256( abi.encodePacked("\x19\x01", eip712DomainHash, hashStruct) ); address signer = ECDSA.recover(hash, signature); require(signer == authority, "ECDSA: Invalid authority"); require(signer != address(0), "ECDSA: invalid signature"); return true; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol) pragma solidity ^0.8.0; /** * @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 `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); /** * @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 // OpenZeppelin Contracts (last updated v4.5.0) (utils/Address.sol) pragma solidity ^0.8.1; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== * * [IMPORTANT] * ==== * You shouldn't rely on `isContract` to protect against flash loan attacks! * * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract * constructor. * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize/address.code.length, which returns 0 // for contracts in construction, since the code is only stored at the end // of the constructor execution. return account.code.length > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); (bool success, ) = recipient.call{value: amount}(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain `call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value ) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue( address target, bytes memory data, uint256 value, string memory errorMessage ) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); (bool success, bytes memory returndata) = target.call{value: value}(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall( address target, bytes memory data, string memory errorMessage ) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); (bool success, bytes memory returndata) = target.staticcall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.4._ */ function functionDelegateCall( address target, bytes memory data, string memory errorMessage ) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); (bool success, bytes memory returndata) = target.delegatecall(data); return verifyCallResult(success, returndata, errorMessage); } /** * @dev Tool to verifies that a low level call was successful, and revert if it wasn't, either by bubbling the * revert reason using the provided one. * * _Available since v4.3._ */ function verifyCallResult( bool success, bytes memory returndata, string memory errorMessage ) internal pure returns (bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.5.0) (utils/cryptography/ECDSA.sol) pragma solidity ^0.8.0; import "../Strings.sol"; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. */ library ECDSA { enum RecoverError { NoError, InvalidSignature, InvalidSignatureLength, InvalidSignatureS, InvalidSignatureV } function _throwError(RecoverError error) private pure { if (error == RecoverError.NoError) { return; // no error: do nothing } else if (error == RecoverError.InvalidSignature) { revert("ECDSA: invalid signature"); } else if (error == RecoverError.InvalidSignatureLength) { revert("ECDSA: invalid signature length"); } else if (error == RecoverError.InvalidSignatureS) { revert("ECDSA: invalid signature 's' value"); } else if (error == RecoverError.InvalidSignatureV) { revert("ECDSA: invalid signature 'v' value"); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature` or error string. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. * * Documentation for signature generation: * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js] * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers] * * _Available since v4.3._ */ function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) { // Check the signature length // - case 65: r,s,v signature (standard) // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._ if (signature.length == 65) { bytes32 r; bytes32 s; uint8 v; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } return tryRecover(hash, v, r, s); } else if (signature.length == 64) { bytes32 r; bytes32 vs; // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) vs := mload(add(signature, 0x40)) } return tryRecover(hash, r, vs); } else { return (address(0), RecoverError.InvalidSignatureLength); } } /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, signature); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately. * * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures] * * _Available since v4.3._ */ function tryRecover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address, RecoverError) { bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff); uint8 v = uint8((uint256(vs) >> 255) + 27); return tryRecover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately. * * _Available since v4.2._ */ function recover( bytes32 hash, bytes32 r, bytes32 vs ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, r, vs); _throwError(error); return recovered; } /** * @dev Overload of {ECDSA-tryRecover} that receives the `v`, * `r` and `s` signature fields separately. * * _Available since v4.3._ */ function tryRecover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address, RecoverError) { // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most // signatures from current libraries generate a unique signature with an s-value in the lower half order. // // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept // these malleable signatures as well. if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) { return (address(0), RecoverError.InvalidSignatureS); } if (v != 27 && v != 28) { return (address(0), RecoverError.InvalidSignatureV); } // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); if (signer == address(0)) { return (address(0), RecoverError.InvalidSignature); } return (signer, RecoverError.NoError); } /** * @dev Overload of {ECDSA-recover} that receives the `v`, * `r` and `s` signature fields separately. */ function recover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address) { (address recovered, RecoverError error) = tryRecover(hash, v, r, s); _throwError(error); return recovered; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } /** * @dev Returns an Ethereum Signed Message, created from `s`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s)); } /** * @dev Returns an Ethereum Signed Typed Data, created from a * `domainSeparator` and a `structHash`. This produces hash corresponding * to the one signed with the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] * JSON-RPC method as part of EIP-712. * * See {recover}. */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash)); } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts v4.4.1 (utils/Strings.sol) pragma solidity ^0.8.0; /** * @dev String operations. */ library Strings { bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef"; /** * @dev Converts a `uint256` to its ASCII `string` decimal representation. */ function toString(uint256 value) internal pure returns (string memory) { // Inspired by OraclizeAPI's implementation - MIT licence // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol if (value == 0) { return "0"; } uint256 temp = value; uint256 digits; while (temp != 0) { digits++; temp /= 10; } bytes memory buffer = new bytes(digits); while (value != 0) { digits -= 1; buffer[digits] = bytes1(uint8(48 + uint256(value % 10))); value /= 10; } return string(buffer); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation. */ function toHexString(uint256 value) internal pure returns (string memory) { if (value == 0) { return "0x00"; } uint256 temp = value; uint256 length = 0; while (temp != 0) { length++; temp >>= 8; } return toHexString(value, length); } /** * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length. */ function toHexString(uint256 value, uint256 length) internal pure returns (string memory) { bytes memory buffer = new bytes(2 * length + 2); buffer[0] = "0"; buffer[1] = "x"; for (uint256 i = 2 * length + 1; i > 1; --i) { buffer[i] = _HEX_SYMBOLS[value & 0xf]; value >>= 4; } require(value == 0, "Strings: hex length insufficient"); return string(buffer); } }
{ "optimizer": { "enabled": true, "runs": 100 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
Contract Security Audit
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lType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"vaultInfo","outputs":[{"internalType":"address","name":"vaultAddress","type":"address"},{"internalType":"address","name":"tokenAddress","type":"address"},{"internalType":"uint256","name":"maxAmount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"verificationAuthority","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"withdrawLedger","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"}]
Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000687f4304df62449dbc6c95fe9a8cb1153d40d42e0000000000000000000000001c4ceb52ab54a35f9d03fcc156a7c57f965e081e000000000000000000000000000000000000000000000000000000e9feab0200
-----Decoded View---------------
Arg [0] : _verificationAuthority (address): 0x687f4304Df62449dBc6C95FE9A8cb1153d40D42e
Arg [1] : vaultAddress (address): 0x1C4ceb52ab54a35F9d03FcC156a7c57F965e081e
Arg [2] : maxAmount (uint256): 1005000000000
-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000687f4304df62449dbc6c95fe9a8cb1153d40d42e
Arg [1] : 0000000000000000000000001c4ceb52ab54a35f9d03fcc156a7c57f965e081e
Arg [2] : 000000000000000000000000000000000000000000000000000000e9feab0200
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Multichain Portfolio | 27 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
---|---|---|---|---|---|
ETH | 100.00% | $1 | 12,900.2777 | $12,900.28 |
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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.