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Latest 25 from a total of 74 transactions
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Approve | 64921796 | 13 days ago | IN | 0 POL | 0.0025414 | ||||
Approve | 64678055 | 20 days ago | IN | 0 POL | 0.00422652 | ||||
Approve | 64645487 | 20 days ago | IN | 0 POL | 0.00154905 | ||||
Approve | 64645467 | 20 days ago | IN | 0 POL | 0.00155633 | ||||
Approve | 64645430 | 20 days ago | IN | 0 POL | 0.00165096 | ||||
Approve | 64645159 | 20 days ago | IN | 0 POL | 0.00197915 | ||||
Approve | 64645061 | 20 days ago | IN | 0 POL | 0.00254228 | ||||
Approve | 64644994 | 20 days ago | IN | 0 POL | 0.00184295 | ||||
Approve | 64644969 | 20 days ago | IN | 0 POL | 0.00182775 | ||||
Approve | 64644952 | 20 days ago | IN | 0 POL | 0.00208581 | ||||
Approve | 64644899 | 20 days ago | IN | 0 POL | 0.00259231 | ||||
Approve | 64644639 | 20 days ago | IN | 0 POL | 0.00287741 | ||||
Approve | 64644612 | 20 days ago | IN | 0 POL | 0.00311992 | ||||
Approve | 64644563 | 20 days ago | IN | 0 POL | 0.00313253 | ||||
Approve | 64644551 | 20 days ago | IN | 0 POL | 0.00341113 | ||||
Approve | 64644504 | 20 days ago | IN | 0 POL | 0.0032926 | ||||
Approve | 64644463 | 20 days ago | IN | 0 POL | 0.00342082 | ||||
Approve | 64644417 | 20 days ago | IN | 0 POL | 0.00524779 | ||||
Approve | 64589245 | 22 days ago | IN | 0 POL | 0.00344693 | ||||
Approve | 64589142 | 22 days ago | IN | 0 POL | 0.00331957 | ||||
Approve | 64588987 | 22 days ago | IN | 0 POL | 0.00561327 | ||||
Approve | 64588928 | 22 days ago | IN | 0 POL | 0.00344764 | ||||
Transfer | 64588740 | 22 days ago | IN | 0 POL | 0.00550041 | ||||
Approve | 64588737 | 22 days ago | IN | 0 POL | 0.00916875 | ||||
Transfer | 64587921 | 22 days ago | IN | 0 POL | 0.00282473 |
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Contract Name:
FiatTokenV2_2
Compiler Version
v0.6.12+commit.27d51765
Optimization Enabled:
Yes with 10000000 runs
Other Settings:
istanbul EvmVersion
Contract Source Code (Solidity Standard Json-Input format)
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; import { EIP712Domain } from "./EIP712Domain.sol"; // solhint-disable-line no-unused-import import { Blacklistable } from "../v1/Blacklistable.sol"; // solhint-disable-line no-unused-import import { FiatTokenV1 } from "../v1/FiatTokenV1.sol"; // solhint-disable-line no-unused-import import { FiatTokenV2 } from "./FiatTokenV2.sol"; // solhint-disable-line no-unused-import import { FiatTokenV2_1 } from "./FiatTokenV2_1.sol"; import { EIP712 } from "../util/EIP712.sol"; // solhint-disable func-name-mixedcase /** * @title FiatToken V2.2 * @notice ERC20 Token backed by fiat reserves, version 2.2 */ contract FiatTokenV2_2 is FiatTokenV2_1 { /** * @notice Initialize v2.2 * @param accountsToBlacklist A list of accounts to migrate from the old blacklist * @param newSymbol New token symbol * data structure to the new blacklist data structure. */ function initializeV2_2( address[] calldata accountsToBlacklist, string calldata newSymbol ) external { // solhint-disable-next-line reason-string require(_initializedVersion == 2); // Update fiat token symbol symbol = newSymbol; // Add previously blacklisted accounts to the new blacklist data structure // and remove them from the old blacklist data structure. for (uint256 i = 0; i < accountsToBlacklist.length; i++) { require( _deprecatedBlacklisted[accountsToBlacklist[i]], "FiatTokenV2_2: Blacklisting previously unblacklisted account!" ); _blacklist(accountsToBlacklist[i]); delete _deprecatedBlacklisted[accountsToBlacklist[i]]; } _blacklist(address(this)); delete _deprecatedBlacklisted[address(this)]; _initializedVersion = 3; } /** * @dev Internal function to get the current chain id. * @return The current chain id. */ function _chainId() internal virtual view returns (uint256) { uint256 chainId; assembly { chainId := chainid() } return chainId; } /** * @inheritdoc EIP712Domain */ function _domainSeparator() internal override view returns (bytes32) { return EIP712.makeDomainSeparator(name, "2", _chainId()); } /** * @notice Update allowance with a signed permit * @dev EOA wallet signatures should be packed in the order of r, s, v. * @param owner Token owner's address (Authorizer) * @param spender Spender's address * @param value Amount of allowance * @param deadline The time at which the signature expires (unix time), or max uint256 value to signal no expiration * @param signature Signature bytes signed by an EOA wallet or a contract wallet */ function permit( address owner, address spender, uint256 value, uint256 deadline, bytes memory signature ) external whenNotPaused { _permit(owner, spender, value, deadline, signature); } /** * @notice Execute a transfer with a signed authorization * @dev EOA wallet signatures should be packed in the order of r, s, v. * @param from Payer's address (Authorizer) * @param to Payee's address * @param value Amount to be transferred * @param validAfter The time after which this is valid (unix time) * @param validBefore The time before which this is valid (unix time) * @param nonce Unique nonce * @param signature Signature bytes signed by an EOA wallet or a contract wallet */ function transferWithAuthorization( address from, address to, uint256 value, uint256 validAfter, uint256 validBefore, bytes32 nonce, bytes memory signature ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) { _transferWithAuthorization( from, to, value, validAfter, validBefore, nonce, signature ); } /** * @notice Receive a transfer with a signed authorization from the payer * @dev This has an additional check to ensure that the payee's address * matches the caller of this function to prevent front-running attacks. * EOA wallet signatures should be packed in the order of r, s, v. * @param from Payer's address (Authorizer) * @param to Payee's address * @param value Amount to be transferred * @param validAfter The time after which this is valid (unix time) * @param validBefore The time before which this is valid (unix time) * @param nonce Unique nonce * @param signature Signature bytes signed by an EOA wallet or a contract wallet */ function receiveWithAuthorization( address from, address to, uint256 value, uint256 validAfter, uint256 validBefore, bytes32 nonce, bytes memory signature ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) { _receiveWithAuthorization( from, to, value, validAfter, validBefore, nonce, signature ); } /** * @notice Attempt to cancel an authorization * @dev Works only if the authorization is not yet used. * EOA wallet signatures should be packed in the order of r, s, v. * @param authorizer Authorizer's address * @param nonce Nonce of the authorization * @param signature Signature bytes signed by an EOA wallet or a contract wallet */ function cancelAuthorization( address authorizer, bytes32 nonce, bytes memory signature ) external whenNotPaused { _cancelAuthorization(authorizer, nonce, signature); } /** * @dev Helper method that sets the blacklist state of an account on balanceAndBlacklistStates. * If _shouldBlacklist is true, we apply a (1 << 255) bitmask with an OR operation on the * account's balanceAndBlacklistState. This flips the high bit for the account to 1, * indicating that the account is blacklisted. * * If _shouldBlacklist if false, we reset the account's balanceAndBlacklistStates to their * balances. This clears the high bit for the account, indicating that the account is unblacklisted. * @param _account The address of the account. * @param _shouldBlacklist True if the account should be blacklisted, false if the account should be unblacklisted. */ function _setBlacklistState(address _account, bool _shouldBlacklist) internal override { balanceAndBlacklistStates[_account] = _shouldBlacklist ? balanceAndBlacklistStates[_account] | (1 << 255) : _balanceOf(_account); } /** * @dev Helper method that sets the balance of an account on balanceAndBlacklistStates. * Since balances are stored in the last 255 bits of the balanceAndBlacklistStates value, * we need to ensure that the updated balance does not exceed (2^255 - 1). * Since blacklisted accounts' balances cannot be updated, the method will also * revert if the account is blacklisted * @param _account The address of the account. * @param _balance The new fiat token balance of the account (max: (2^255 - 1)). */ function _setBalance(address _account, uint256 _balance) internal override { require( _balance <= ((1 << 255) - 1), "FiatTokenV2_2: Balance exceeds (2^255 - 1)" ); require( !_isBlacklisted(_account), "FiatTokenV2_2: Account is blacklisted" ); balanceAndBlacklistStates[_account] = _balance; } /** * @inheritdoc Blacklistable */ function _isBlacklisted(address _account) internal override view returns (bool) { return balanceAndBlacklistStates[_account] >> 255 == 1; } /** * @dev Helper method to obtain the balance of an account. Since balances * are stored in the last 255 bits of the balanceAndBlacklistStates value, * we apply a ((1 << 255) - 1) bit bitmask with an AND operation on the * balanceAndBlacklistState to obtain the balance. * @param _account The address of the account. * @return The fiat token balance of the account. */ function _balanceOf(address _account) internal override view returns (uint256) { return balanceAndBlacklistStates[_account] & ((1 << 255) - 1); } /** * @inheritdoc FiatTokenV1 */ function approve(address spender, uint256 value) external override whenNotPaused returns (bool) { _approve(msg.sender, spender, value); return true; } /** * @inheritdoc FiatTokenV2 */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external override whenNotPaused { _permit(owner, spender, value, deadline, v, r, s); } /** * @inheritdoc FiatTokenV2 */ function increaseAllowance(address spender, uint256 increment) external override whenNotPaused returns (bool) { _increaseAllowance(msg.sender, spender, increment); return true; } /** * @inheritdoc FiatTokenV2 */ function decreaseAllowance(address spender, uint256 decrement) external override whenNotPaused returns (bool) { _decreaseAllowance(msg.sender, spender, decrement); return true; } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.2 <0.8.0; /** * @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 * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 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"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (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"); // solhint-disable-next-line avoid-low-level-calls (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"); // solhint-disable-next-line avoid-low-level-calls (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"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private 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 // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; import "./IERC20.sol"; import "../../math/SafeMath.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 SafeMath for uint256; 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' // solhint-disable-next-line max-line-length 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).add(value); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).sub(value, "SafeERC20: decreased allowance below zero"); _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 // solhint-disable-next-line max-line-length require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <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 `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); }
// SPDX-License-Identifier: MIT pragma solidity >=0.6.0 <0.8.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) { uint256 c = a + b; if (c < a) return (false, 0); return (true, c); } /** * @dev Returns the substraction of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b > a) return (false, 0); return (true, a - b); } /** * @dev Returns the multiplication of two unsigned integers, with an overflow flag. * * _Available since v3.4._ */ function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522 if (a == 0) return (true, 0); uint256 c = a * b; if (c / a != b) return (false, 0); return (true, c); } /** * @dev Returns the division of two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a / b); } /** * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag. * * _Available since v3.4._ */ function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) { if (b == 0) return (false, 0); return (true, a % b); } /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { require(b <= a, "SafeMath: subtraction overflow"); return a - b; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * * - Multiplication cannot overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { if (a == 0) return 0; uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers, reverting on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { require(b > 0, "SafeMath: division by zero"); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { require(b > 0, "SafeMath: modulo by zero"); return a % b; } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {trySub}. * * Counterpart to Solidity's `-` operator. * * Requirements: * * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); return a - b; } /** * @dev Returns the integer division of two unsigned integers, reverting with custom message on * division by zero. The result is rounded towards zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryDiv}. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); return a / b; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * reverting with custom message when dividing by zero. * * CAUTION: This function is deprecated because it requires allocating memory for the error * message unnecessarily. For custom revert reasons use {tryMod}. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); return a % b; } }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; import { FiatTokenV2 } from "./FiatTokenV2.sol"; // solhint-disable func-name-mixedcase /** * @title FiatToken V2.1 * @notice ERC20 Token backed by fiat reserves, version 2.1 */ contract FiatTokenV2_1 is FiatTokenV2 { /** * @notice Initialize v2.1 * @param lostAndFound The address to which the locked funds are sent */ function initializeV2_1(address lostAndFound) external { // solhint-disable-next-line reason-string require(_initializedVersion == 1); uint256 lockedAmount = _balanceOf(address(this)); if (lockedAmount > 0) { _transfer(address(this), lostAndFound, lockedAmount); } _blacklist(address(this)); _initializedVersion = 2; } /** * @notice Version string for the EIP712 domain separator * @return Version string */ function version() external pure returns (string memory) { return "2"; } }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; import { FiatTokenV1_1 } from "../v1.1/FiatTokenV1_1.sol"; import { EIP712 } from "../util/EIP712.sol"; import { EIP3009 } from "./EIP3009.sol"; import { EIP2612 } from "./EIP2612.sol"; /** * @title FiatToken V2 * @notice ERC20 Token backed by fiat reserves, version 2 */ contract FiatTokenV2 is FiatTokenV1_1, EIP3009, EIP2612 { uint8 internal _initializedVersion; /** * @notice Initialize v2 * @param newName New token name */ function initializeV2(string calldata newName) external { // solhint-disable-next-line reason-string require(initialized && _initializedVersion == 0); name = newName; _DEPRECATED_CACHED_DOMAIN_SEPARATOR = EIP712.makeDomainSeparator( newName, "2" ); _initializedVersion = 1; } /** * @notice Increase the allowance by a given increment * @param spender Spender's address * @param increment Amount of increase in allowance * @return True if successful */ function increaseAllowance(address spender, uint256 increment) external virtual whenNotPaused notBlacklisted(msg.sender) notBlacklisted(spender) returns (bool) { _increaseAllowance(msg.sender, spender, increment); return true; } /** * @notice Decrease the allowance by a given decrement * @param spender Spender's address * @param decrement Amount of decrease in allowance * @return True if successful */ function decreaseAllowance(address spender, uint256 decrement) external virtual whenNotPaused notBlacklisted(msg.sender) notBlacklisted(spender) returns (bool) { _decreaseAllowance(msg.sender, spender, decrement); return true; } /** * @notice Execute a transfer with a signed authorization * @param from Payer's address (Authorizer) * @param to Payee's address * @param value Amount to be transferred * @param validAfter The time after which this is valid (unix time) * @param validBefore The time before which this is valid (unix time) * @param nonce Unique nonce * @param v v of the signature * @param r r of the signature * @param s s of the signature */ function transferWithAuthorization( address from, address to, uint256 value, uint256 validAfter, uint256 validBefore, bytes32 nonce, uint8 v, bytes32 r, bytes32 s ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) { _transferWithAuthorization( from, to, value, validAfter, validBefore, nonce, v, r, s ); } /** * @notice Receive a transfer with a signed authorization from the payer * @dev This has an additional check to ensure that the payee's address * matches the caller of this function to prevent front-running attacks. * @param from Payer's address (Authorizer) * @param to Payee's address * @param value Amount to be transferred * @param validAfter The time after which this is valid (unix time) * @param validBefore The time before which this is valid (unix time) * @param nonce Unique nonce * @param v v of the signature * @param r r of the signature * @param s s of the signature */ function receiveWithAuthorization( address from, address to, uint256 value, uint256 validAfter, uint256 validBefore, bytes32 nonce, uint8 v, bytes32 r, bytes32 s ) external whenNotPaused notBlacklisted(from) notBlacklisted(to) { _receiveWithAuthorization( from, to, value, validAfter, validBefore, nonce, v, r, s ); } /** * @notice Attempt to cancel an authorization * @dev Works only if the authorization is not yet used. * @param authorizer Authorizer's address * @param nonce Nonce of the authorization * @param v v of the signature * @param r r of the signature * @param s s of the signature */ function cancelAuthorization( address authorizer, bytes32 nonce, uint8 v, bytes32 r, bytes32 s ) external whenNotPaused { _cancelAuthorization(authorizer, nonce, v, r, s); } /** * @notice Update allowance with a signed permit * @param owner Token owner's address (Authorizer) * @param spender Spender's address * @param value Amount of allowance * @param deadline The time at which the signature expires (unix time), or max uint256 value to signal no expiration * @param v v of the signature * @param r r of the signature * @param s s of the signature */ function permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) external virtual whenNotPaused notBlacklisted(owner) notBlacklisted(spender) { _permit(owner, spender, value, deadline, v, r, s); } /** * @dev Internal function to increase the allowance by a given increment * @param owner Token owner's address * @param spender Spender's address * @param increment Amount of increase */ function _increaseAllowance( address owner, address spender, uint256 increment ) internal override { _approve(owner, spender, allowed[owner][spender].add(increment)); } /** * @dev Internal function to decrease the allowance by a given decrement * @param owner Token owner's address * @param spender Spender's address * @param decrement Amount of decrease */ function _decreaseAllowance( address owner, address spender, uint256 decrement ) internal override { _approve( owner, spender, allowed[owner][spender].sub( decrement, "ERC20: decreased allowance below zero" ) ); } }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; // solhint-disable func-name-mixedcase /** * @title EIP712 Domain */ contract EIP712Domain { // was originally DOMAIN_SEPARATOR // but that has been moved to a method so we can override it in V2_2+ bytes32 internal _DEPRECATED_CACHED_DOMAIN_SEPARATOR; /** * @notice Get the EIP712 Domain Separator. * @return The bytes32 EIP712 domain separator. */ function DOMAIN_SEPARATOR() external view returns (bytes32) { return _domainSeparator(); } /** * @dev Internal method to get the EIP712 Domain Separator. * @return The bytes32 EIP712 domain separator. */ function _domainSeparator() internal virtual view returns (bytes32) { return _DEPRECATED_CACHED_DOMAIN_SEPARATOR; } }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; import { AbstractFiatTokenV2 } from "./AbstractFiatTokenV2.sol"; import { EIP712Domain } from "./EIP712Domain.sol"; import { SignatureChecker } from "../util/SignatureChecker.sol"; import { MessageHashUtils } from "../util/MessageHashUtils.sol"; /** * @title EIP-3009 * @notice Provide internal implementation for gas-abstracted transfers * @dev Contracts that inherit from this must wrap these with publicly * accessible functions, optionally adding modifiers where necessary */ abstract contract EIP3009 is AbstractFiatTokenV2, EIP712Domain { // keccak256("TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)") bytes32 public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267; // keccak256("ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)") bytes32 public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8; // keccak256("CancelAuthorization(address authorizer,bytes32 nonce)") bytes32 public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429; /** * @dev authorizer address => nonce => bool (true if nonce is used) */ mapping(address => mapping(bytes32 => bool)) private _authorizationStates; event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce); event AuthorizationCanceled( address indexed authorizer, bytes32 indexed nonce ); /** * @notice Returns the state of an authorization * @dev Nonces are randomly generated 32-byte data unique to the * authorizer's address * @param authorizer Authorizer's address * @param nonce Nonce of the authorization * @return True if the nonce is used */ function authorizationState(address authorizer, bytes32 nonce) external view returns (bool) { return _authorizationStates[authorizer][nonce]; } /** * @notice Execute a transfer with a signed authorization * @param from Payer's address (Authorizer) * @param to Payee's address * @param value Amount to be transferred * @param validAfter The time after which this is valid (unix time) * @param validBefore The time before which this is valid (unix time) * @param nonce Unique nonce * @param v v of the signature * @param r r of the signature * @param s s of the signature */ function _transferWithAuthorization( address from, address to, uint256 value, uint256 validAfter, uint256 validBefore, bytes32 nonce, uint8 v, bytes32 r, bytes32 s ) internal { _transferWithAuthorization( from, to, value, validAfter, validBefore, nonce, abi.encodePacked(r, s, v) ); } /** * @notice Execute a transfer with a signed authorization * @dev EOA wallet signatures should be packed in the order of r, s, v. * @param from Payer's address (Authorizer) * @param to Payee's address * @param value Amount to be transferred * @param validAfter The time after which this is valid (unix time) * @param validBefore The time before which this is valid (unix time) * @param nonce Unique nonce * @param signature Signature byte array produced by an EOA wallet or a contract wallet */ function _transferWithAuthorization( address from, address to, uint256 value, uint256 validAfter, uint256 validBefore, bytes32 nonce, bytes memory signature ) internal { _requireValidAuthorization(from, nonce, validAfter, validBefore); _requireValidSignature( from, keccak256( abi.encode( TRANSFER_WITH_AUTHORIZATION_TYPEHASH, from, to, value, validAfter, validBefore, nonce ) ), signature ); _markAuthorizationAsUsed(from, nonce); _transfer(from, to, value); } /** * @notice Receive a transfer with a signed authorization from the payer * @dev This has an additional check to ensure that the payee's address * matches the caller of this function to prevent front-running attacks. * @param from Payer's address (Authorizer) * @param to Payee's address * @param value Amount to be transferred * @param validAfter The time after which this is valid (unix time) * @param validBefore The time before which this is valid (unix time) * @param nonce Unique nonce * @param v v of the signature * @param r r of the signature * @param s s of the signature */ function _receiveWithAuthorization( address from, address to, uint256 value, uint256 validAfter, uint256 validBefore, bytes32 nonce, uint8 v, bytes32 r, bytes32 s ) internal { _receiveWithAuthorization( from, to, value, validAfter, validBefore, nonce, abi.encodePacked(r, s, v) ); } /** * @notice Receive a transfer with a signed authorization from the payer * @dev This has an additional check to ensure that the payee's address * matches the caller of this function to prevent front-running attacks. * EOA wallet signatures should be packed in the order of r, s, v. * @param from Payer's address (Authorizer) * @param to Payee's address * @param value Amount to be transferred * @param validAfter The time after which this is valid (unix time) * @param validBefore The time before which this is valid (unix time) * @param nonce Unique nonce * @param signature Signature byte array produced by an EOA wallet or a contract wallet */ function _receiveWithAuthorization( address from, address to, uint256 value, uint256 validAfter, uint256 validBefore, bytes32 nonce, bytes memory signature ) internal { require(to == msg.sender, "FiatTokenV2: caller must be the payee"); _requireValidAuthorization(from, nonce, validAfter, validBefore); _requireValidSignature( from, keccak256( abi.encode( RECEIVE_WITH_AUTHORIZATION_TYPEHASH, from, to, value, validAfter, validBefore, nonce ) ), signature ); _markAuthorizationAsUsed(from, nonce); _transfer(from, to, value); } /** * @notice Attempt to cancel an authorization * @param authorizer Authorizer's address * @param nonce Nonce of the authorization * @param v v of the signature * @param r r of the signature * @param s s of the signature */ function _cancelAuthorization( address authorizer, bytes32 nonce, uint8 v, bytes32 r, bytes32 s ) internal { _cancelAuthorization(authorizer, nonce, abi.encodePacked(r, s, v)); } /** * @notice Attempt to cancel an authorization * @dev EOA wallet signatures should be packed in the order of r, s, v. * @param authorizer Authorizer's address * @param nonce Nonce of the authorization * @param signature Signature byte array produced by an EOA wallet or a contract wallet */ function _cancelAuthorization( address authorizer, bytes32 nonce, bytes memory signature ) internal { _requireUnusedAuthorization(authorizer, nonce); _requireValidSignature( authorizer, keccak256( abi.encode(CANCEL_AUTHORIZATION_TYPEHASH, authorizer, nonce) ), signature ); _authorizationStates[authorizer][nonce] = true; emit AuthorizationCanceled(authorizer, nonce); } /** * @notice Validates that signature against input data struct * @param signer Signer's address * @param dataHash Hash of encoded data struct * @param signature Signature byte array produced by an EOA wallet or a contract wallet */ function _requireValidSignature( address signer, bytes32 dataHash, bytes memory signature ) private view { require( SignatureChecker.isValidSignatureNow( signer, MessageHashUtils.toTypedDataHash(_domainSeparator(), dataHash), signature ), "FiatTokenV2: invalid signature" ); } /** * @notice Check that an authorization is unused * @param authorizer Authorizer's address * @param nonce Nonce of the authorization */ function _requireUnusedAuthorization(address authorizer, bytes32 nonce) private view { require( !_authorizationStates[authorizer][nonce], "FiatTokenV2: authorization is used or canceled" ); } /** * @notice Check that authorization is valid * @param authorizer Authorizer's address * @param nonce Nonce of the authorization * @param validAfter The time after which this is valid (unix time) * @param validBefore The time before which this is valid (unix time) */ function _requireValidAuthorization( address authorizer, bytes32 nonce, uint256 validAfter, uint256 validBefore ) private view { require( now > validAfter, "FiatTokenV2: authorization is not yet valid" ); require(now < validBefore, "FiatTokenV2: authorization is expired"); _requireUnusedAuthorization(authorizer, nonce); } /** * @notice Mark an authorization as used * @param authorizer Authorizer's address * @param nonce Nonce of the authorization */ function _markAuthorizationAsUsed(address authorizer, bytes32 nonce) private { _authorizationStates[authorizer][nonce] = true; emit AuthorizationUsed(authorizer, nonce); } }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; import { AbstractFiatTokenV2 } from "./AbstractFiatTokenV2.sol"; import { EIP712Domain } from "./EIP712Domain.sol"; import { MessageHashUtils } from "../util/MessageHashUtils.sol"; import { SignatureChecker } from "../util/SignatureChecker.sol"; /** * @title EIP-2612 * @notice Provide internal implementation for gas-abstracted approvals */ abstract contract EIP2612 is AbstractFiatTokenV2, EIP712Domain { // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)") bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9; mapping(address => uint256) private _permitNonces; /** * @notice Nonces for permit * @param owner Token owner's address (Authorizer) * @return Next nonce */ function nonces(address owner) external view returns (uint256) { return _permitNonces[owner]; } /** * @notice Verify a signed approval permit and execute if valid * @param owner Token owner's address (Authorizer) * @param spender Spender's address * @param value Amount of allowance * @param deadline The time at which the signature expires (unix time), or max uint256 value to signal no expiration * @param v v of the signature * @param r r of the signature * @param s s of the signature */ function _permit( address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s ) internal { _permit(owner, spender, value, deadline, abi.encodePacked(r, s, v)); } /** * @notice Verify a signed approval permit and execute if valid * @dev EOA wallet signatures should be packed in the order of r, s, v. * @param owner Token owner's address (Authorizer) * @param spender Spender's address * @param value Amount of allowance * @param deadline The time at which the signature expires (unix time), or max uint256 value to signal no expiration * @param signature Signature byte array signed by an EOA wallet or a contract wallet */ function _permit( address owner, address spender, uint256 value, uint256 deadline, bytes memory signature ) internal { require( deadline == type(uint256).max || deadline >= now, "FiatTokenV2: permit is expired" ); bytes32 typedDataHash = MessageHashUtils.toTypedDataHash( _domainSeparator(), keccak256( abi.encode( PERMIT_TYPEHASH, owner, spender, value, _permitNonces[owner]++, deadline ) ) ); require( SignatureChecker.isValidSignatureNow( owner, typedDataHash, signature ), "EIP2612: invalid signature" ); _approve(owner, spender, value); } }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; import { AbstractFiatTokenV1 } from "../v1/AbstractFiatTokenV1.sol"; abstract contract AbstractFiatTokenV2 is AbstractFiatTokenV1 { function _increaseAllowance( address owner, address spender, uint256 increment ) internal virtual; function _decreaseAllowance( address owner, address spender, uint256 decrement ) internal virtual; }
/** * SPDX-License-Identifier: MIT * * Copyright (c) 2016 Smart Contract Solutions, Inc. * Copyright (c) 2018-2020 CENTRE SECZ * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ pragma solidity 0.6.12; import { Ownable } from "./Ownable.sol"; /** * @notice Base contract which allows children to implement an emergency stop * mechanism * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/feb665136c0dae9912e08397c1a21c4af3651ef3/contracts/lifecycle/Pausable.sol * Modifications: * 1. Added pauser role, switched pause/unpause to be onlyPauser (6/14/2018) * 2. Removed whenNotPause/whenPaused from pause/unpause (6/14/2018) * 3. Removed whenPaused (6/14/2018) * 4. Switches ownable library to use ZeppelinOS (7/12/18) * 5. Remove constructor (7/13/18) * 6. Reformat, conform to Solidity 0.6 syntax and add error messages (5/13/20) * 7. Make public functions external (5/27/20) */ contract Pausable is Ownable { event Pause(); event Unpause(); event PauserChanged(address indexed newAddress); address public pauser; bool public paused = false; /** * @dev Modifier to make a function callable only when the contract is not paused. */ modifier whenNotPaused() { require(!paused, "Pausable: paused"); _; } /** * @dev throws if called by any account other than the pauser */ modifier onlyPauser() { require(msg.sender == pauser, "Pausable: caller is not the pauser"); _; } /** * @dev called by the owner to pause, triggers stopped state */ function pause() external onlyPauser { paused = true; emit Pause(); } /** * @dev called by the owner to unpause, returns to normal state */ function unpause() external onlyPauser { paused = false; emit Unpause(); } /** * @notice Updates the pauser address. * @param _newPauser The address of the new pauser. */ function updatePauser(address _newPauser) external onlyOwner { require( _newPauser != address(0), "Pausable: new pauser is the zero address" ); pauser = _newPauser; emit PauserChanged(pauser); } }
/** * SPDX-License-Identifier: MIT * * Copyright (c) 2018 zOS Global Limited. * Copyright (c) 2018-2020 CENTRE SECZ * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ pragma solidity 0.6.12; /** * @notice The Ownable contract has an owner address, and provides basic * authorization control functions * @dev Forked from https://github.com/OpenZeppelin/openzeppelin-labs/blob/3887ab77b8adafba4a26ace002f3a684c1a3388b/upgradeability_ownership/contracts/ownership/Ownable.sol * Modifications: * 1. Consolidate OwnableStorage into this contract (7/13/18) * 2. Reformat, conform to Solidity 0.6 syntax, and add error messages (5/13/20) * 3. Make public functions external (5/27/20) */ contract Ownable { // Owner of the contract address private _owner; /** * @dev Event to show ownership has been transferred * @param previousOwner representing the address of the previous owner * @param newOwner representing the address of the new owner */ event OwnershipTransferred(address previousOwner, address newOwner); /** * @dev The constructor sets the original owner of the contract to the sender account. */ constructor() public { setOwner(msg.sender); } /** * @dev Tells the address of the owner * @return the address of the owner */ function owner() external view returns (address) { return _owner; } /** * @dev Sets a new owner address */ function setOwner(address newOwner) internal { _owner = newOwner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(msg.sender == _owner, "Ownable: caller is not the owner"); _; } /** * @dev Allows the current owner to transfer control of the contract to a newOwner. * @param newOwner The address to transfer ownership to. */ function transferOwnership(address newOwner) external onlyOwner { require( newOwner != address(0), "Ownable: new owner is the zero address" ); emit OwnershipTransferred(_owner, newOwner); setOwner(newOwner); } }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; import { SafeMath } from "@openzeppelin/contracts/math/SafeMath.sol"; import { AbstractFiatTokenV1 } from "./AbstractFiatTokenV1.sol"; import { Ownable } from "./Ownable.sol"; import { Pausable } from "./Pausable.sol"; import { Blacklistable } from "./Blacklistable.sol"; /** * @title FiatToken * @dev ERC20 Token backed by fiat reserves */ contract FiatTokenV1 is AbstractFiatTokenV1, Ownable, Pausable, Blacklistable { using SafeMath for uint256; string public name; string public symbol; uint8 public decimals; string public currency; address public masterMinter; bool internal initialized; /// @dev A mapping that stores the balance and blacklist states for a given address. /// The first bit defines whether the address is blacklisted (1 if blacklisted, 0 otherwise). /// The last 255 bits define the balance for the address. mapping(address => uint256) internal balanceAndBlacklistStates; mapping(address => mapping(address => uint256)) internal allowed; uint256 internal totalSupply_ = 0; mapping(address => bool) internal minters; mapping(address => uint256) internal minterAllowed; event Mint(address indexed minter, address indexed to, uint256 amount); event Burn(address indexed burner, uint256 amount); event MinterConfigured(address indexed minter, uint256 minterAllowedAmount); event MinterRemoved(address indexed oldMinter); event MasterMinterChanged(address indexed newMasterMinter); /** * @notice Initializes the fiat token contract. * @param tokenName The name of the fiat token. * @param tokenSymbol The symbol of the fiat token. * @param tokenCurrency The fiat currency that the token represents. * @param tokenDecimals The number of decimals that the token uses. * @param newMasterMinter The masterMinter address for the fiat token. * @param newPauser The pauser address for the fiat token. * @param newBlacklister The blacklister address for the fiat token. * @param newOwner The owner of the fiat token. */ function initialize( string memory tokenName, string memory tokenSymbol, string memory tokenCurrency, uint8 tokenDecimals, address newMasterMinter, address newPauser, address newBlacklister, address newOwner ) public { require(!initialized, "FiatToken: contract is already initialized"); require( newMasterMinter != address(0), "FiatToken: new masterMinter is the zero address" ); require( newPauser != address(0), "FiatToken: new pauser is the zero address" ); require( newBlacklister != address(0), "FiatToken: new blacklister is the zero address" ); require( newOwner != address(0), "FiatToken: new owner is the zero address" ); name = tokenName; symbol = tokenSymbol; currency = tokenCurrency; decimals = tokenDecimals; masterMinter = newMasterMinter; pauser = newPauser; blacklister = newBlacklister; setOwner(newOwner); initialized = true; } /** * @dev Throws if called by any account other than a minter. */ modifier onlyMinters() { require(minters[msg.sender], "FiatToken: caller is not a minter"); _; } /** * @notice Mints fiat tokens to an address. * @param _to The address that will receive the minted tokens. * @param _amount The amount of tokens to mint. Must be less than or equal * to the minterAllowance of the caller. * @return True if the operation was successful. */ function mint(address _to, uint256 _amount) external whenNotPaused onlyMinters notBlacklisted(msg.sender) notBlacklisted(_to) returns (bool) { require(_to != address(0), "FiatToken: mint to the zero address"); require(_amount > 0, "FiatToken: mint amount not greater than 0"); uint256 mintingAllowedAmount = minterAllowed[msg.sender]; require( _amount <= mintingAllowedAmount, "FiatToken: mint amount exceeds minterAllowance" ); totalSupply_ = totalSupply_.add(_amount); _setBalance(_to, _balanceOf(_to).add(_amount)); minterAllowed[msg.sender] = mintingAllowedAmount.sub(_amount); emit Mint(msg.sender, _to, _amount); emit Transfer(address(0), _to, _amount); return true; } /** * @dev Throws if called by any account other than the masterMinter */ modifier onlyMasterMinter() { require( msg.sender == masterMinter, "FiatToken: caller is not the masterMinter" ); _; } /** * @notice Gets the minter allowance for an account. * @param minter The address to check. * @return The remaining minter allowance for the account. */ function minterAllowance(address minter) external view returns (uint256) { return minterAllowed[minter]; } /** * @notice Checks if an account is a minter. * @param account The address to check. * @return True if the account is a minter, false if the account is not a minter. */ function isMinter(address account) external view returns (bool) { return minters[account]; } /** * @notice Gets the remaining amount of fiat tokens a spender is allowed to transfer on * behalf of the token owner. * @param owner The token owner's address. * @param spender The spender's address. * @return The remaining allowance. */ function allowance(address owner, address spender) external override view returns (uint256) { return allowed[owner][spender]; } /** * @notice Gets the totalSupply of the fiat token. * @return The totalSupply of the fiat token. */ function totalSupply() external override view returns (uint256) { return totalSupply_; } /** * @notice Gets the fiat token balance of an account. * @param account The address to check. * @return balance The fiat token balance of the account. */ function balanceOf(address account) external override view returns (uint256) { return _balanceOf(account); } /** * @notice Sets a fiat token allowance for a spender to spend on behalf of the caller. * @param spender The spender's address. * @param value The allowance amount. * @return True if the operation was successful. */ function approve(address spender, uint256 value) external virtual override whenNotPaused notBlacklisted(msg.sender) notBlacklisted(spender) returns (bool) { _approve(msg.sender, spender, value); return true; } /** * @dev Internal function to set allowance. * @param owner Token owner's address. * @param spender Spender's address. * @param value Allowance amount. */ function _approve( address owner, address spender, uint256 value ) internal override { require(owner != address(0), "ERC20: approve from the zero address"); require(spender != address(0), "ERC20: approve to the zero address"); allowed[owner][spender] = value; emit Approval(owner, spender, value); } /** * @notice Transfers tokens from an address to another by spending the caller's allowance. * @dev The caller must have some fiat token allowance on the payer's tokens. * @param from Payer's address. * @param to Payee's address. * @param value Transfer amount. * @return True if the operation was successful. */ function transferFrom( address from, address to, uint256 value ) external override whenNotPaused notBlacklisted(msg.sender) notBlacklisted(from) notBlacklisted(to) returns (bool) { require( value <= allowed[from][msg.sender], "ERC20: transfer amount exceeds allowance" ); _transfer(from, to, value); allowed[from][msg.sender] = allowed[from][msg.sender].sub(value); return true; } /** * @notice Transfers tokens from the caller. * @param to Payee's address. * @param value Transfer amount. * @return True if the operation was successful. */ function transfer(address to, uint256 value) external override whenNotPaused notBlacklisted(msg.sender) notBlacklisted(to) returns (bool) { _transfer(msg.sender, to, value); return true; } /** * @dev Internal function to process transfers. * @param from Payer's address. * @param to Payee's address. * @param value Transfer amount. */ function _transfer( address from, address to, uint256 value ) internal override { require(from != address(0), "ERC20: transfer from the zero address"); require(to != address(0), "ERC20: transfer to the zero address"); require( value <= _balanceOf(from), "ERC20: transfer amount exceeds balance" ); _setBalance(from, _balanceOf(from).sub(value)); _setBalance(to, _balanceOf(to).add(value)); emit Transfer(from, to, value); } /** * @notice Adds or updates a new minter with a mint allowance. * @param minter The address of the minter. * @param minterAllowedAmount The minting amount allowed for the minter. * @return True if the operation was successful. */ function configureMinter(address minter, uint256 minterAllowedAmount) external whenNotPaused onlyMasterMinter returns (bool) { minters[minter] = true; minterAllowed[minter] = minterAllowedAmount; emit MinterConfigured(minter, minterAllowedAmount); return true; } /** * @notice Removes a minter. * @param minter The address of the minter to remove. * @return True if the operation was successful. */ function removeMinter(address minter) external onlyMasterMinter returns (bool) { minters[minter] = false; minterAllowed[minter] = 0; emit MinterRemoved(minter); return true; } /** * @notice Allows a minter to burn some of its own tokens. * @dev The caller must be a minter, must not be blacklisted, and the amount to burn * should be less than or equal to the account's balance. * @param _amount the amount of tokens to be burned. */ function burn(uint256 _amount) external whenNotPaused onlyMinters notBlacklisted(msg.sender) { uint256 balance = _balanceOf(msg.sender); require(_amount > 0, "FiatToken: burn amount not greater than 0"); require(balance >= _amount, "FiatToken: burn amount exceeds balance"); totalSupply_ = totalSupply_.sub(_amount); _setBalance(msg.sender, balance.sub(_amount)); emit Burn(msg.sender, _amount); emit Transfer(msg.sender, address(0), _amount); } /** * @notice Updates the master minter address. * @param _newMasterMinter The address of the new master minter. */ function updateMasterMinter(address _newMasterMinter) external onlyOwner { require( _newMasterMinter != address(0), "FiatToken: new masterMinter is the zero address" ); masterMinter = _newMasterMinter; emit MasterMinterChanged(masterMinter); } /** * @inheritdoc Blacklistable */ function _blacklist(address _account) internal override { _setBlacklistState(_account, true); } /** * @inheritdoc Blacklistable */ function _unBlacklist(address _account) internal override { _setBlacklistState(_account, false); } /** * @dev Helper method that sets the blacklist state of an account. * @param _account The address of the account. * @param _shouldBlacklist True if the account should be blacklisted, false if the account should be unblacklisted. */ function _setBlacklistState(address _account, bool _shouldBlacklist) internal virtual { _deprecatedBlacklisted[_account] = _shouldBlacklist; } /** * @dev Helper method that sets the balance of an account. * @param _account The address of the account. * @param _balance The new fiat token balance of the account. */ function _setBalance(address _account, uint256 _balance) internal virtual { balanceAndBlacklistStates[_account] = _balance; } /** * @inheritdoc Blacklistable */ function _isBlacklisted(address _account) internal virtual override view returns (bool) { return _deprecatedBlacklisted[_account]; } /** * @dev Helper method to obtain the balance of an account. * @param _account The address of the account. * @return The fiat token balance of the account. */ function _balanceOf(address _account) internal virtual view returns (uint256) { return balanceAndBlacklistStates[_account]; } }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; import { Ownable } from "./Ownable.sol"; /** * @title Blacklistable Token * @dev Allows accounts to be blacklisted by a "blacklister" role */ abstract contract Blacklistable is Ownable { address public blacklister; mapping(address => bool) internal _deprecatedBlacklisted; event Blacklisted(address indexed _account); event UnBlacklisted(address indexed _account); event BlacklisterChanged(address indexed newBlacklister); /** * @dev Throws if called by any account other than the blacklister. */ modifier onlyBlacklister() { require( msg.sender == blacklister, "Blacklistable: caller is not the blacklister" ); _; } /** * @dev Throws if argument account is blacklisted. * @param _account The address to check. */ modifier notBlacklisted(address _account) { require( !_isBlacklisted(_account), "Blacklistable: account is blacklisted" ); _; } /** * @notice Checks if account is blacklisted. * @param _account The address to check. * @return True if the account is blacklisted, false if the account is not blacklisted. */ function isBlacklisted(address _account) external view returns (bool) { return _isBlacklisted(_account); } /** * @notice Adds account to blacklist. * @param _account The address to blacklist. */ function blacklist(address _account) external onlyBlacklister { _blacklist(_account); emit Blacklisted(_account); } /** * @notice Removes account from blacklist. * @param _account The address to remove from the blacklist. */ function unBlacklist(address _account) external onlyBlacklister { _unBlacklist(_account); emit UnBlacklisted(_account); } /** * @notice Updates the blacklister address. * @param _newBlacklister The address of the new blacklister. */ function updateBlacklister(address _newBlacklister) external onlyOwner { require( _newBlacklister != address(0), "Blacklistable: new blacklister is the zero address" ); blacklister = _newBlacklister; emit BlacklisterChanged(blacklister); } /** * @dev Checks if account is blacklisted. * @param _account The address to check. * @return true if the account is blacklisted, false otherwise. */ function _isBlacklisted(address _account) internal virtual view returns (bool); /** * @dev Helper method that blacklists an account. * @param _account The address to blacklist. */ function _blacklist(address _account) internal virtual; /** * @dev Helper method that unblacklists an account. * @param _account The address to unblacklist. */ function _unBlacklist(address _account) internal virtual; }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; abstract contract AbstractFiatTokenV1 is IERC20 { function _approve( address owner, address spender, uint256 value ) internal virtual; function _transfer( address from, address to, uint256 value ) internal virtual; }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; import { Ownable } from "../v1/Ownable.sol"; import { IERC20 } from "@openzeppelin/contracts/token/ERC20/IERC20.sol"; import { SafeERC20 } from "@openzeppelin/contracts/token/ERC20/SafeERC20.sol"; contract Rescuable is Ownable { using SafeERC20 for IERC20; address private _rescuer; event RescuerChanged(address indexed newRescuer); /** * @notice Returns current rescuer * @return Rescuer's address */ function rescuer() external view returns (address) { return _rescuer; } /** * @notice Revert if called by any account other than the rescuer. */ modifier onlyRescuer() { require(msg.sender == _rescuer, "Rescuable: caller is not the rescuer"); _; } /** * @notice Rescue ERC20 tokens locked up in this contract. * @param tokenContract ERC20 token contract address * @param to Recipient address * @param amount Amount to withdraw */ function rescueERC20( IERC20 tokenContract, address to, uint256 amount ) external onlyRescuer { tokenContract.safeTransfer(to, amount); } /** * @notice Updates the rescuer address. * @param newRescuer The address of the new rescuer. */ function updateRescuer(address newRescuer) external onlyOwner { require( newRescuer != address(0), "Rescuable: new rescuer is the zero address" ); _rescuer = newRescuer; emit RescuerChanged(newRescuer); } }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; import { FiatTokenV1 } from "../v1/FiatTokenV1.sol"; import { Rescuable } from "./Rescuable.sol"; /** * @title FiatTokenV1_1 * @dev ERC20 Token backed by fiat reserves */ contract FiatTokenV1_1 is FiatTokenV1, Rescuable { }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; import { ECRecover } from "./ECRecover.sol"; import { IERC1271 } from "../interface/IERC1271.sol"; /** * @dev Signature verification helper that can be used instead of `ECRecover.recover` to seamlessly support both ECDSA * signatures from externally owned accounts (EOAs) as well as ERC1271 signatures from smart contract wallets. * * Adapted from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/21bb89ef5bfc789b9333eb05e3ba2b7b284ac77c/contracts/utils/cryptography/SignatureChecker.sol */ library SignatureChecker { /** * @dev Checks if a signature is valid for a given signer and data hash. If the signer is a smart contract, the * signature is validated against that smart contract using ERC1271, otherwise it's validated using `ECRecover.recover`. * @param signer Address of the claimed signer * @param digest Keccak-256 hash digest of the signed message * @param signature Signature byte array associated with hash */ function isValidSignatureNow( address signer, bytes32 digest, bytes memory signature ) external view returns (bool) { if (!isContract(signer)) { return ECRecover.recover(digest, signature) == signer; } return isValidERC1271SignatureNow(signer, digest, signature); } /** * @dev Checks if a signature is valid for a given signer and data hash. The signature is validated * against the signer smart contract using ERC1271. * @param signer Address of the claimed signer * @param digest Keccak-256 hash digest of the signed message * @param signature Signature byte array associated with hash * * NOTE: Unlike ECDSA signatures, contract signatures are revocable, and the outcome of this function can thus * change through time. It could return true at block N and false at block N+1 (or the opposite). */ function isValidERC1271SignatureNow( address signer, bytes32 digest, bytes memory signature ) internal view returns (bool) { (bool success, bytes memory result) = signer.staticcall( abi.encodeWithSelector( IERC1271.isValidSignature.selector, digest, signature ) ); return (success && result.length >= 32 && abi.decode(result, (bytes32)) == bytes32(IERC1271.isValidSignature.selector)); } /** * @dev Checks if the input address is a smart contract. */ function isContract(address addr) internal view returns (bool) { uint256 size; assembly { size := extcodesize(addr) } return size > 0; } }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; /** * @dev Signature message hash utilities for producing digests to be consumed by {ECDSA} recovery or signing. * * The library provides methods for generating a hash of a message that conforms to the * https://eips.ethereum.org/EIPS/eip-191[EIP 191] and https://eips.ethereum.org/EIPS/eip-712[EIP 712] * specifications. */ library MessageHashUtils { /** * @dev Returns the keccak256 digest of an EIP-712 typed data (EIP-191 version `0x01`). * Adapted from https://github.com/OpenZeppelin/openzeppelin-contracts/blob/21bb89ef5bfc789b9333eb05e3ba2b7b284ac77c/contracts/utils/cryptography/MessageHashUtils.sol * * The digest is calculated from a `domainSeparator` and a `structHash`, by prefixing them with * `\x19\x01` and hashing the result. It corresponds to the hash signed by the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] JSON-RPC method as part of EIP-712. * * @param domainSeparator Domain separator * @param structHash Hashed EIP-712 data struct * @return digest The keccak256 digest of an EIP-712 typed data */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32 digest) { assembly { let ptr := mload(0x40) mstore(ptr, "\x19\x01") mstore(add(ptr, 0x02), domainSeparator) mstore(add(ptr, 0x22), structHash) digest := keccak256(ptr, 0x42) } } }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; /** * @title EIP712 * @notice A library that provides EIP712 helper functions */ library EIP712 { /** * @notice Make EIP712 domain separator * @param name Contract name * @param version Contract version * @param chainId Blockchain ID * @return Domain separator */ function makeDomainSeparator( string memory name, string memory version, uint256 chainId ) internal view returns (bytes32) { return keccak256( abi.encode( // keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)") 0x8b73c3c69bb8fe3d512ecc4cf759cc79239f7b179b0ffacaa9a75d522b39400f, keccak256(bytes(name)), keccak256(bytes(version)), chainId, address(this) ) ); } /** * @notice Make EIP712 domain separator * @param name Contract name * @param version Contract version * @return Domain separator */ function makeDomainSeparator(string memory name, string memory version) internal view returns (bytes32) { uint256 chainId; assembly { chainId := chainid() } return makeDomainSeparator(name, version, chainId); } }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; /** * @title ECRecover * @notice A library that provides a safe ECDSA recovery function */ library ECRecover { /** * @notice Recover signer's address from a signed message * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/65e4ffde586ec89af3b7e9140bdc9235d1254853/contracts/cryptography/ECDSA.sol * Modifications: Accept v, r, and s as separate arguments * @param digest Keccak-256 hash digest of the signed message * @param v v of the signature * @param r r of the signature * @param s s of the signature * @return Signer address */ function recover( bytes32 digest, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address) { // 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 (281): 0 < s < secp256k1n ÷ 2 + 1, and for v in (282): 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 ) { revert("ECRecover: invalid signature 's' value"); } if (v != 27 && v != 28) { revert("ECRecover: invalid signature 'v' value"); } // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(digest, v, r, s); require(signer != address(0), "ECRecover: invalid signature"); return signer; } /** * @notice Recover signer's address from a signed message * @dev Adapted from: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/0053ee040a7ff1dbc39691c9e67a69f564930a88/contracts/utils/cryptography/ECDSA.sol * @param digest Keccak-256 hash digest of the signed message * @param signature Signature byte array associated with hash * @return Signer address */ function recover(bytes32 digest, bytes memory signature) internal pure returns (address) { require(signature.length == 65, "ECRecover: invalid signature length"); 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 recover(digest, v, r, s); } }
/** * SPDX-License-Identifier: Apache-2.0 * * Copyright (c) 2023, Circle Internet Financial, LLC. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ pragma solidity 0.6.12; /** * @dev Interface of the ERC1271 standard signature validation method for * contracts as defined in https://eips.ethereum.org/EIPS/eip-1271[ERC-1271]. */ interface IERC1271 { /** * @dev Should return whether the signature provided is valid for the provided data * @param hash Hash of the data to be signed * @param signature Signature byte array associated with the provided data hash * @return magicValue bytes4 magic value 0x1626ba7e when function passes */ function isValidSignature(bytes32 hash, bytes memory signature) external view returns (bytes4 magicValue); }
{ "remappings": [], "optimizer": { "enabled": true, "runs": 10000000 }, "evmVersion": "istanbul", "libraries": { "/Users/aloysius.chan/Repositories/circlefin/stablecoin-evm-private-usdc-mainnet-pgn/contracts/util/SignatureChecker.sol": { "SignatureChecker": "0x03Da5A1AE03B5F60B162A098c617c13b4dC2dA69" } }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } } }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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IERC20","name":"tokenContract","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"rescueERC20","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"rescuer","outputs":[{"internalType":"address","name":"","type":"address"}],"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":"value","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":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"validAfter","type":"uint256"},{"internalType":"uint256","name":"validBefore","type":"uint256"},{"internalType":"bytes32","name":"nonce","type":"bytes32"},{"internalType":"bytes","name":"signature","type":"bytes"}],"name":"transferWithAuthorization","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"uint256","name":"validAfter","type":"uint256"},{"internalType":"uint256","name":"validBefore","type":"uint256"},{"internalType":"bytes32","name":"nonce","type":"bytes32"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"transferWithAuthorization","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"}],"name":"unBlacklist","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"unpause","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newBlacklister","type":"address"}],"name":"updateBlacklister","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newMasterMinter","type":"address"}],"name":"updateMasterMinter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newPauser","type":"address"}],"name":"updatePauser","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newRescuer","type":"address"}],"name":"updateRescuer","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"version","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"pure","type":"function"}]
Contract Creation Code
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Multichain Portfolio | 30 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.