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ERC-20
Overview
Max Total Supply
602.175213087455839667 WPOWETH
Holders
51
Market
Onchain Market Cap
$0.00
Circulating Supply Market Cap
-
Other Info
Token Contract (WITH 18 Decimals)
Balance
0.000000000000000001 WPOWETHValue
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
WrappedPoWETH
Compiler Version
v0.8.9+commit.e5eed63a
Optimization Enabled:
Yes with 1000 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.9; import {TrieProofs} from "./lib/TrieProofs.sol"; import {RLP} from "./lib/RLP.sol"; import {Multicall} from "./Multicall.sol"; import {ERC20} from "@openzeppelin/contracts/token/ERC20/ERC20.sol"; import {ECDSA} from "@openzeppelin/contracts/utils/cryptography/ECDSA.sol"; contract WrappedPoWETH is ERC20, Multicall { using TrieProofs for bytes; using RLP for RLP.RLPItem; using RLP for bytes; event Withdrawal(uint256 id, uint256 amount, address withdrawMadeBy, address recipient); event StateRootRelay(uint256 block, bytes32 root); uint8 private constant ACCOUNT_STORAGE_ROOT_INDEX = 2; address public immutable relayer; address public immutable depositContract; uint256 public immutable depositsMapSlotIndex; uint256 public withdrawalsCount; mapping(uint256 => bytes32) public withdrawals; mapping(uint256 => bytes32) public stateRoots; mapping(uint256 => bytes32) public depositContractStorageRoots; mapping(uint256 => bool) public processedDeposits; uint256 private constant ONE = 10**18; uint256 public constant mintFeeRate = ONE / 100; // 1/100 = 1%. address public constant feeRecipient = 0xF9c89ee442cE6D2c14b9dB97f367E0A72657271f; uint256 public feesAccrued; constructor( address _relayer, address _depositContract, uint256 _depositsMapSlotIndex ) ERC20("WrappedPoWETH", "WPOWETH") { relayer = _relayer; depositContract = _depositContract; depositsMapSlotIndex = _depositsMapSlotIndex; } function updateDepositContractStorageRoot(uint256 blockNumber, bytes memory accountProof) public { bytes32 stateRoot = stateRoots[blockNumber]; require(stateRoot != bytes32(0), "ERR_STATE_ROOT_NOT_AVAILABLE"); bytes32 accountProofPath = keccak256(abi.encodePacked(depositContract)); bytes memory accountRLP = accountProof.verify(stateRoot, accountProofPath); // reverts if proof is invalid bytes32 accountStorageRoot = bytes32(accountRLP.toRLPItem().toList()[ACCOUNT_STORAGE_ROOT_INDEX].toUint()); depositContractStorageRoots[blockNumber] = accountStorageRoot; } function mint( uint256 depositId, address recipient, uint256 amount, uint256 depositBlockNumber, bytes memory storageProof ) public { bytes32 accountStorageRoot = depositContractStorageRoots[depositBlockNumber]; require(accountStorageRoot != bytes32(0), "ERR_STORAGE_ROOT_NOT_AVAILABLE"); uint256 slot = uint256(keccak256(abi.encode(depositId, depositsMapSlotIndex))); require(!processedDeposits[depositId], "ERR_DEPOSIT_ALREADY_PROCESSED"); bytes32 proofPath = keccak256(abi.encodePacked(slot)); uint256 slotValue = storageProof.verify(accountStorageRoot, proofPath).toRLPItem().toUint(); // reverts if proof is invalid require(keccak256(abi.encode(amount, recipient)) == bytes32(slotValue), "ERR_INVALID_DATA"); uint256 feeAmount = (amount * mintFeeRate) / ONE; feesAccrued += feeAmount; processedDeposits[depositId] = true; _mint(recipient, amount - feeAmount); } function withdraw(uint256 amount, address recipient) public { _burn(msg.sender, amount); withdrawals[withdrawalsCount] = keccak256(abi.encode(amount, recipient)); emit Withdrawal(withdrawalsCount++, amount, msg.sender, recipient); } function withdrawFees() external { uint256 tokensToMint = feesAccrued; feesAccrued = 0; _mint(feeRecipient, tokensToMint); } function relayStateRoot( uint256 blockNumber, bytes32 stateRoot, bytes calldata signature ) public { require(relayer == ECDSA.recover(stateRoot, signature)); stateRoots[blockNumber] = stateRoot; emit StateRootRelay(blockNumber, stateRoot); } }
// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.9; abstract contract Multicall { function multicall(bytes[] calldata data) external returns (bytes[] memory results) { results = new bytes[](data.length); for (uint256 i = 0; i < data.length; i++) { (bool success, bytes memory result) = address(this).delegatecall(data[i]); if (!success) { // Next 5 lines from https://ethereum.stackexchange.com/a/83577 if (result.length < 68) revert(); assembly { result := add(result, 0x04) } revert(abi.decode(result, (string))); } results[i] = result; } } }
// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.9; library RLP { uint8 constant STRING_SHORT_START = 0x80; uint8 constant STRING_LONG_START = 0xb8; uint8 constant LIST_SHORT_START = 0xc0; uint8 constant LIST_LONG_START = 0xf8; uint8 constant WORD_SIZE = 32; struct RLPItem { uint256 len; uint256 memPtr; } /* * @param item RLP encoded bytes */ function toRLPItem(bytes memory item) internal pure returns (RLPItem memory) { if (item.length == 0) return RLPItem(0, 0); uint256 memPtr; assembly { memPtr := add(item, 0x20) } return RLPItem(item.length, memPtr); } /* * @param item RLP encoded list in bytes */ function toList(RLPItem memory item) internal pure returns (RLPItem[] memory result) { require(isList(item), "Cannot convert to list a non-list RLPItem."); uint256 items = numItems(item); result = new RLPItem[](items); uint256 memPtr = item.memPtr + _payloadOffset(item.memPtr); uint256 dataLen; for (uint256 i = 0; i < items; i++) { dataLen = _itemLength(memPtr); result[i] = RLPItem(dataLen, memPtr); memPtr = memPtr + dataLen; } } /* * Helpers */ // @return indicator whether encoded payload is a list. negate this function call for isData. function isList(RLPItem memory item) internal pure returns (bool) { uint8 byte0; uint256 memPtr = item.memPtr; assembly { byte0 := byte(0, mload(memPtr)) } if (byte0 < LIST_SHORT_START) return false; return true; } // @return number of payload items inside an encoded list. function numItems(RLPItem memory item) internal pure returns (uint256) { uint256 count = 0; uint256 currPtr = item.memPtr + _payloadOffset(item.memPtr); uint256 endPtr = item.memPtr + item.len; while (currPtr < endPtr) { currPtr = currPtr + _itemLength(currPtr); // skip over an item count++; } return count; } // @return entire rlp item byte length function _itemLength(uint256 memPtr) internal pure returns (uint256 len) { uint256 byte0; assembly { byte0 := byte(0, mload(memPtr)) } if (byte0 < STRING_SHORT_START) return 1; else if (byte0 < STRING_LONG_START) return byte0 - STRING_SHORT_START + 1; else if (byte0 < LIST_SHORT_START) { assembly { let byteLen := sub(byte0, 0xb7) // # of bytes the actual length is memPtr := add(memPtr, 1) // skip over the first byte /* 32 byte word size */ let dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to get the len len := add(dataLen, add(byteLen, 1)) } } else if (byte0 < LIST_LONG_START) { return byte0 - LIST_SHORT_START + 1; } else { assembly { let byteLen := sub(byte0, 0xf7) memPtr := add(memPtr, 1) let dataLen := div(mload(memPtr), exp(256, sub(32, byteLen))) // right shifting to the correct length len := add(dataLen, add(byteLen, 1)) } } } // @return number of bytes until the data function _payloadOffset(uint256 memPtr) internal pure returns (uint256) { uint256 byte0; assembly { byte0 := byte(0, mload(memPtr)) } if (byte0 < STRING_SHORT_START) return 0; else if (byte0 < STRING_LONG_START || (byte0 >= LIST_SHORT_START && byte0 < LIST_LONG_START)) return 1; else if (byte0 < LIST_SHORT_START) // being explicit return byte0 - (STRING_LONG_START - 1) + 1; else return byte0 - (LIST_LONG_START - 1) + 1; } /** RLPItem conversions into data types **/ // @returns raw rlp encoding in bytes function toRLPBytes(RLPItem memory item) internal pure returns (bytes memory) { bytes memory result = new bytes(item.len); uint256 ptr; assembly { ptr := add(0x20, result) } copy(item.memPtr, ptr, item.len); return result; } function toBoolean(RLPItem memory item) internal pure returns (bool) { require(item.len == 1, "Invalid RLPItem. Booleans are encoded in 1 byte"); uint256 result; uint256 memPtr = item.memPtr; assembly { result := byte(0, mload(memPtr)) } return result == 0 ? false : true; } function toAddress(RLPItem memory item) internal pure returns (address) { // 1 byte for the length prefix according to RLP spec require(item.len <= 21, "Invalid RLPItem. Addresses are encoded in 20 bytes or less"); return address(uint160(toUint(item))); } function toUint(RLPItem memory item) internal pure returns (uint256) { uint256 offset = _payloadOffset(item.memPtr); uint256 len = item.len - offset; uint256 memPtr = item.memPtr + offset; uint256 result; assembly { result := div(mload(memPtr), exp(256, sub(32, len))) // shift to the correct location } return result; } function toBytes(RLPItem memory item) internal pure returns (bytes memory) { uint256 offset = _payloadOffset(item.memPtr); uint256 len = item.len - offset; // data length bytes memory result = new bytes(len); uint256 destPtr; assembly { destPtr := add(0x20, result) } copy(item.memPtr + offset, destPtr, len); return result; } /* * @param src Pointer to source * @param dest Pointer to destination * @param len Amount of memory to copy from the source */ function copy( uint256 src, uint256 dest, uint256 len ) internal pure { // copy as many word sizes as possible for (; len >= WORD_SIZE; len -= WORD_SIZE) { assembly { mstore(dest, mload(src)) } src += WORD_SIZE; dest += WORD_SIZE; } // left over bytes. Mask is used to remove unwanted bytes from the word unchecked { uint256 mask = 256**(WORD_SIZE - len) - 1; assembly { let srcpart := and(mload(src), not(mask)) // zero out src let destpart := and(mload(dest), mask) // retrieve the bytes mstore(dest, or(destpart, srcpart)) } } } }
// SPDX-License-Identifier: UNLICENSED pragma solidity ^0.8.9; import "./RLP.sol"; /* Forked from: https://github.com/lorenzb/proveth/blob/master/onchain/ProvethVerifier.sol */ library TrieProofs { using RLP for RLP.RLPItem; using RLP for bytes; bytes32 internal constant EMPTY_TRIE_ROOT_HASH = 0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421; function verify( bytes memory proofRLP, bytes32 rootHash, bytes32 path32 ) internal pure returns (bytes memory value) { // TODO: Optimize by using word-size paths instead of byte arrays bytes memory path = new bytes(32); assembly { mstore(add(path, 0x20), path32) } // careful as path may need to be 64 path = decodeNibbles(path, 0); // lol, so efficient RLP.RLPItem[] memory proof = proofRLP.toRLPItem().toList(); uint8 nodeChildren; RLP.RLPItem memory children; uint256 pathOffset = 0; // Offset of the proof bytes32 nextHash; // Required hash for the next node if (proof.length == 0) { // Root hash of empty tx trie require(rootHash == EMPTY_TRIE_ROOT_HASH, "Bad empty proof"); return new bytes(0); } for (uint256 i = 0; i < proof.length; i++) { // We use the fact that an rlp encoded list consists of some // encoding of its length plus the concatenation of its // *rlp-encoded* items. bytes memory rlpNode = proof[i].toRLPBytes(); // TODO: optimize by not encoding and decoding? if (i == 0) { require(rootHash == keccak256(rlpNode), "Bad first proof part"); } else { require(nextHash == keccak256(rlpNode), "Bad hash"); } RLP.RLPItem[] memory node = proof[i].toList(); // Extension or Leaf node if (node.length == 2) { /* // TODO: wtf is a divergent node // proof claims divergent extension or leaf if (proofIndexes[i] == 0xff) { require(i >= proof.length - 1); // divergent node must come last in proof require(prefixLength != nodePath.length); // node isn't divergent require(pathOffset == path.length); // didn't consume entire path return new bytes(0); } require(proofIndexes[i] == 1); // an extension/leaf node only has two fields. require(prefixLength == nodePath.length); // node is divergent */ bytes memory nodePath = merklePatriciaCompactDecode(node[0].toBytes()); pathOffset += sharedPrefixLength(pathOffset, path, nodePath); // last proof item if (i == proof.length - 1) { require(pathOffset == path.length, "Unexpected end of proof (leaf)"); return node[1].toBytes(); // Data is the second item in a leaf node } else { // not last proof item children = node[1]; if (!children.isList()) { nextHash = getNextHash(children); } else { nextHash = keccak256(children.toRLPBytes()); } } } else { // Must be a branch node at this point require(node.length == 17, "Invalid node length"); if (i == proof.length - 1) { // Proof ends in a branch node, exclusion proof in most cases if (pathOffset + 1 == path.length) { return node[16].toBytes(); } else { nodeChildren = extractNibble(path32, pathOffset); children = node[nodeChildren]; // Ensure that the next path item is empty, end of exclusion proof require(children.toBytes().length == 0, "Invalid exclusion proof"); return new bytes(0); } } else { require(pathOffset < path.length, "Continuing branch has depleted path"); nodeChildren = extractNibble(path32, pathOffset); children = node[nodeChildren]; pathOffset += 1; // advance by one // not last level if (!children.isList()) { nextHash = getNextHash(children); } else { nextHash = keccak256(children.toRLPBytes()); } } } } // no invalid proof should ever reach this point assert(false); } function getNextHash(RLP.RLPItem memory node) internal pure returns (bytes32 nextHash) { bytes memory nextHashBytes = node.toBytes(); require(nextHashBytes.length == 32, "Invalid node"); assembly { nextHash := mload(add(nextHashBytes, 0x20)) } } /* * Nibble is extracted as the least significant nibble in the returned byte */ function extractNibble(bytes32 path, uint256 position) internal pure returns (uint8 nibble) { require(position < 64, "Invalid nibble position"); bytes1 shifted = position == 0 ? bytes1(path >> 4) : bytes1(path << ((position - 1) * 4)); return uint8(bytes1(uint8(shifted) & uint8(0xF))); } function decodeNibbles(bytes memory compact, uint256 skipNibbles) internal pure returns (bytes memory nibbles) { require(compact.length > 0, "Empty bytes array"); uint256 length = compact.length * 2; require(skipNibbles <= length, "Skip nibbles amount too large"); length -= skipNibbles; nibbles = new bytes(length); uint256 nibblesLength = 0; for (uint256 i = skipNibbles; i < skipNibbles + length; i += 1) { if (i % 2 == 0) { nibbles[nibblesLength] = bytes1((uint8(compact[i / 2]) >> 4) & 0xF); } else { nibbles[nibblesLength] = bytes1((uint8(compact[i / 2]) >> 0) & 0xF); } nibblesLength += 1; } assert(nibblesLength == nibbles.length); } function merklePatriciaCompactDecode(bytes memory compact) internal pure returns (bytes memory nibbles) { require(compact.length > 0, "Empty bytes array"); uint256 first_nibble = (uint8(compact[0]) >> 4) & 0xF; uint256 skipNibbles; if (first_nibble == 0) { skipNibbles = 2; } else if (first_nibble == 1) { skipNibbles = 1; } else if (first_nibble == 2) { skipNibbles = 2; } else if (first_nibble == 3) { skipNibbles = 1; } else { // Not supposed to happen! revert(); } return decodeNibbles(compact, skipNibbles); } function sharedPrefixLength( uint256 xsOffset, bytes memory xs, bytes memory ys ) internal pure returns (uint256) { uint256 i = 0; for (i = 0; i + xsOffset < xs.length && i < ys.length; i++) { if (xs[i + xsOffset] != ys[i]) { return i; } } return i; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (token/ERC20/ERC20.sol) pragma solidity ^0.8.0; import "./IERC20.sol"; import "./extensions/IERC20Metadata.sol"; import "../../utils/Context.sol"; /** * @dev Implementation of the {IERC20} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * For a generic mechanism see {ERC20PresetMinterPauser}. * * TIP: For a detailed writeup see our guide * https://forum.zeppelin.solutions/t/how-to-implement-erc20-supply-mechanisms/226[How * to implement supply mechanisms]. * * We have followed general OpenZeppelin Contracts guidelines: functions revert * instead returning `false` on failure. This behavior is nonetheless * conventional and does not conflict with the expectations of ERC20 * applications. * * Additionally, an {Approval} event is emitted on calls to {transferFrom}. * This allows applications to reconstruct the allowance for all accounts just * by listening to said events. Other implementations of the EIP may not emit * these events, as it isn't required by the specification. * * Finally, the non-standard {decreaseAllowance} and {increaseAllowance} * functions have been added to mitigate the well-known issues around setting * allowances. See {IERC20-approve}. */ contract ERC20 is Context, IERC20, IERC20Metadata { mapping(address => uint256) private _balances; mapping(address => mapping(address => uint256)) private _allowances; uint256 private _totalSupply; string private _name; string private _symbol; /** * @dev Sets the values for {name} and {symbol}. * * The default value of {decimals} is 18. To select a different value for * {decimals} you should overload it. * * All two of these values are immutable: they can only be set once during * construction. */ constructor(string memory name_, string memory symbol_) { _name = name_; _symbol = symbol_; } /** * @dev Returns the name of the token. */ function name() public view virtual override returns (string memory) { return _name; } /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() public view virtual override returns (string memory) { return _symbol; } /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5.05` (`505 / 10 ** 2`). * * Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless this function is * overridden; * * NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. */ function decimals() public view virtual override returns (uint8) { return 18; } /** * @dev See {IERC20-totalSupply}. */ function totalSupply() public view virtual override returns (uint256) { return _totalSupply; } /** * @dev See {IERC20-balanceOf}. */ function balanceOf(address account) public view virtual override returns (uint256) { return _balances[account]; } /** * @dev See {IERC20-transfer}. * * Requirements: * * - `to` cannot be the zero address. * - the caller must have a balance of at least `amount`. */ function transfer(address to, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _transfer(owner, to, amount); return true; } /** * @dev See {IERC20-allowance}. */ function allowance(address owner, address spender) public view virtual override returns (uint256) { return _allowances[owner][spender]; } /** * @dev See {IERC20-approve}. * * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on * `transferFrom`. This is semantically equivalent to an infinite approval. * * Requirements: * * - `spender` cannot be the zero address. */ function approve(address spender, uint256 amount) public virtual override returns (bool) { address owner = _msgSender(); _approve(owner, spender, amount); return true; } /** * @dev See {IERC20-transferFrom}. * * Emits an {Approval} event indicating the updated allowance. This is not * required by the EIP. See the note at the beginning of {ERC20}. * * NOTE: Does not update the allowance if the current allowance * is the maximum `uint256`. * * Requirements: * * - `from` and `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. * - the caller must have allowance for ``from``'s tokens of at least * `amount`. */ function transferFrom( address from, address to, uint256 amount ) public virtual override returns (bool) { address spender = _msgSender(); _spendAllowance(from, spender, amount); _transfer(from, to, amount); return true; } /** * @dev Atomically increases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. */ function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) { address owner = _msgSender(); _approve(owner, spender, allowance(owner, spender) + addedValue); return true; } /** * @dev Atomically decreases the allowance granted to `spender` by the caller. * * This is an alternative to {approve} that can be used as a mitigation for * problems described in {IERC20-approve}. * * Emits an {Approval} event indicating the updated allowance. * * Requirements: * * - `spender` cannot be the zero address. * - `spender` must have allowance for the caller of at least * `subtractedValue`. */ function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) { address owner = _msgSender(); uint256 currentAllowance = allowance(owner, spender); require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero"); unchecked { _approve(owner, spender, currentAllowance - subtractedValue); } return true; } /** * @dev Moves `amount` of tokens from `from` to `to`. * * This internal function is equivalent to {transfer}, and can be used to * e.g. implement automatic token fees, slashing mechanisms, etc. * * Emits a {Transfer} event. * * Requirements: * * - `from` cannot be the zero address. * - `to` cannot be the zero address. * - `from` must have a balance of at least `amount`. */ function _transfer( address from, address to, uint256 amount ) internal virtual { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); _beforeTokenTransfer(from, to, amount); uint256 fromBalance = _balances[from]; require(fromBalance >= amount, "ERC20: transfer amount exceeds balance"); unchecked { _balances[from] = fromBalance - amount; } _balances[to] += amount; emit Transfer(from, to, amount); _afterTokenTransfer(from, to, amount); } /** @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * Emits a {Transfer} event with `from` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. */ function _mint(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: mint to the zero address"); _beforeTokenTransfer(address(0), account, amount); _totalSupply += amount; _balances[account] += amount; emit Transfer(address(0), account, amount); _afterTokenTransfer(address(0), account, amount); } /** * @dev Destroys `amount` tokens from `account`, reducing the * total supply. * * Emits a {Transfer} event with `to` set to the zero address. * * Requirements: * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. */ function _burn(address account, uint256 amount) internal virtual { require(account != address(0), "ERC20: burn from the zero address"); _beforeTokenTransfer(account, address(0), amount); uint256 accountBalance = _balances[account]; require(accountBalance >= amount, "ERC20: burn amount exceeds balance"); unchecked { _balances[account] = accountBalance - amount; } _totalSupply -= amount; emit Transfer(account, address(0), amount); _afterTokenTransfer(account, address(0), amount); } /** * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens. * * This internal function is equivalent to `approve`, and can be used to * e.g. set automatic allowances for certain subsystems, etc. * * Emits an {Approval} event. * * Requirements: * * - `owner` cannot be the zero address. * - `spender` cannot be the zero address. */ function _approve( address owner, address spender, uint256 amount ) internal virtual { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); _allowances[owner][spender] = amount; emit Approval(owner, spender, amount); } /** * @dev Updates `owner` s allowance for `spender` based on spent `amount`. * * Does not update the allowance amount in case of infinite allowance. * Revert if not enough allowance is available. * * Might emit an {Approval} event. */ function _spendAllowance( address owner, address spender, uint256 amount ) internal virtual { uint256 currentAllowance = allowance(owner, spender); if (currentAllowance != type(uint256).max) { require(currentAllowance >= amount, "ERC20: insufficient allowance"); unchecked { _approve(owner, spender, currentAllowance - amount); } } } /** * @dev Hook that is called before any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * will be transferred to `to`. * - when `from` is zero, `amount` tokens will be minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens will be burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _beforeTokenTransfer( address from, address to, uint256 amount ) internal virtual {} /** * @dev Hook that is called after any transfer of tokens. This includes * minting and burning. * * Calling conditions: * * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens * has been transferred to `to`. * - when `from` is zero, `amount` tokens have been minted for `to`. * - when `to` is zero, `amount` of ``from``'s tokens have been burned. * - `from` and `to` are never both zero. * * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks]. */ function _afterTokenTransfer( address from, address to, uint256 amount ) internal virtual {} }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.3) (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) { 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. /// @solidity memory-safe-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 { 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 (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 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 (utils/Context.sol) pragma solidity ^0.8.0; /** * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ abstract contract Context { function _msgSender() internal view virtual returns (address) { return msg.sender; } function _msgData() internal view virtual returns (bytes calldata) { return msg.data; } }
// SPDX-License-Identifier: MIT // OpenZeppelin Contracts (last updated v4.7.0) (utils/Strings.sol) pragma solidity ^0.8.0; /** * @dev String operations. */ library Strings { bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef"; uint8 private constant _ADDRESS_LENGTH = 20; /** * @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); } /** * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation. */ function toHexString(address addr) internal pure returns (string memory) { return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH); } }
{ "optimizer": { "enabled": true, "runs": 1000 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
Contract Security Audit
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[{"inputs":[{"internalType":"address","name":"_relayer","type":"address"},{"internalType":"address","name":"_depositContract","type":"address"},{"internalType":"uint256","name":"_depositsMapSlotIndex","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"block","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"root","type":"bytes32"}],"name":"StateRootRelay","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"value","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"id","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"withdrawMadeBy","type":"address"},{"indexed":false,"internalType":"address","name":"recipient","type":"address"}],"name":"Withdrawal","type":"event"},{"inputs":[{"internalType":"address","name":"owner","type":"address"},{"internalType":"address","name":"spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"subtractedValue","type":"uint256"}],"name":"decreaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"depositContract","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"depositContractStorageRoots","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"depositsMapSlotIndex","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"feeRecipient","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"feesAccrued","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"spender","type":"address"},{"internalType":"uint256","name":"addedValue","type":"uint256"}],"name":"increaseAllowance","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"depositId","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"depositBlockNumber","type":"uint256"},{"internalType":"bytes","name":"storageProof","type":"bytes"}],"name":"mint","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"mintFeeRate","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes[]","name":"data","type":"bytes[]"}],"name":"multicall","outputs":[{"internalType":"bytes[]","name":"results","type":"bytes[]"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"processedDeposits","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"blockNumber","type":"uint256"},{"internalType":"bytes32","name":"stateRoot","type":"bytes32"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"relayStateRoot","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"relayer","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"stateRoots","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"blockNumber","type":"uint256"},{"internalType":"bytes","name":"accountProof","type":"bytes"}],"name":"updateDepositContractStorageRoot","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"recipient","type":"address"}],"name":"withdraw","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdrawFees","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"withdrawals","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"withdrawalsCount","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)
0000000000000000000000003c35c56a1899b521cb1258747f750105e0de5aa6000000000000000000000000325a87aabeaa1097011f4838d9152ba44e7f282b0000000000000000000000000000000000000000000000000000000000000003
-----Decoded View---------------
Arg [0] : _relayer (address): 0x3C35c56A1899B521cb1258747F750105E0De5aA6
Arg [1] : _depositContract (address): 0x325a87aabeAa1097011f4838D9152BA44E7F282B
Arg [2] : _depositsMapSlotIndex (uint256): 3
-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 0000000000000000000000003c35c56a1899b521cb1258747f750105e0de5aa6
Arg [1] : 000000000000000000000000325a87aabeaa1097011f4838d9152ba44e7f282b
Arg [2] : 0000000000000000000000000000000000000000000000000000000000000003
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A token is a representation of an on-chain or off-chain asset. The token page shows information such as price, total supply, holders, transfers and social links. Learn more about this page in our Knowledge Base.