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Latest 8 from a total of 8 transactions
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Mint | 20249956 | 169 days ago | IN | 0 ETH | 0.00003588 | ||||
Approve | 18105059 | 470 days ago | IN | 0 ETH | 0.00054168 | ||||
Approve | 17960983 | 490 days ago | IN | 0 ETH | 0.0006013 | ||||
Increase Allowan... | 16952547 | 632 days ago | IN | 0 ETH | 0.00083928 | ||||
Approve | 16952538 | 632 days ago | IN | 0 ETH | 0.00116331 | ||||
Initialize V2_1 | 14133760 | 1053 days ago | IN | 0 ETH | 0.00505757 | ||||
Initialize V2 | 14133741 | 1053 days ago | IN | 0 ETH | 0.00629528 | ||||
Initialize | 14133736 | 1053 days ago | IN | 0 ETH | 0.00727835 |
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Contract Name:
StakedTokenV1
Compiler Version
v0.6.12+commit.27d51765
Optimization Enabled:
Yes with 1000000 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
/** * SPDX-License-Identifier: MIT * * Copyright (c) 2022 Coinbase, Inc. * * 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 { FiatTokenV2_1 } from "centre-tokens/contracts/v2/FiatTokenV2_1.sol"; /** * @title StakedTokenV1 * @notice ERC20 token backed by staked cryptocurrency reserves, version 1 */ contract StakedTokenV1 is FiatTokenV2_1 { /** * @dev Storage slot with the address of the current oracle. * This is the keccak-256 hash of "org.coinbase.stakedToken.exchangeRateOracle" */ bytes32 private constant _EXCHANGE_RATE_ORACLE_POSITION = keccak256( "org.coinbase.stakedToken.exchangeRateOracle" ); /** * @dev Storage slot with the current exchange rate. * This is the keccak-256 hash of "org.coinbase.stakedToken.exchangeRate" */ bytes32 private constant _EXCHANGE_RATE_POSITION = keccak256( "org.coinbase.stakedToken.exchangeRate" ); /** * @dev Emitted when the oracle is updated * @param newOracle The address of the new oracle */ event OracleUpdated(address indexed newOracle); /** * @dev Emitted when the exchange rate is updated * @param oracle The address initiating the exchange rate update * @param newExchangeRate The new exchange rate */ event ExchangeRateUpdated(address indexed oracle, uint256 newExchangeRate); /** * @dev Throws if called by any account other than the oracle */ modifier onlyOracle() { require( msg.sender == oracle(), "StakedTokenV1: caller is not the oracle" ); _; } /** * @dev Function to update the oracle * @param newOracle The new oracle */ function updateOracle(address newOracle) external onlyOwner { require( newOracle != address(0), "StakedTokenV1: oracle is the zero address" ); require( newOracle != oracle(), "StakedTokenV1: new oracle is already the oracle" ); bytes32 position = _EXCHANGE_RATE_ORACLE_POSITION; assembly { sstore(position, newOracle) } emit OracleUpdated(newOracle); } /** * @dev Function to update the exchange rate * @param newExchangeRate The new exchange rate */ function updateExchangeRate(uint256 newExchangeRate) external onlyOracle { require( newExchangeRate > 0, "StakedTokenV1: new exchange rate cannot be 0" ); bytes32 position = _EXCHANGE_RATE_POSITION; assembly { sstore(position, newExchangeRate) } emit ExchangeRateUpdated(msg.sender, newExchangeRate); } /** * @dev Returns the address of the current oracle * @return _oracle The address of the oracle */ function oracle() public view returns (address _oracle) { bytes32 position = _EXCHANGE_RATE_ORACLE_POSITION; assembly { _oracle := sload(position) } } /** * @dev Returns the current exchange rate scaled by by 10**18 * @return _exchangeRate The exchange rate */ function exchangeRate() public view returns (uint256 _exchangeRate) { bytes32 position = _EXCHANGE_RATE_POSITION; assembly { _exchangeRate := sload(position) } } }
/** * SPDX-License-Identifier: MIT * * 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 { 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 = balances[address(this)]; if (lockedAmount > 0) { _transfer(address(this), lostAndFound, lockedAmount); } blacklisted[address(this)] = true; _initializedVersion = 2; } /** * @notice Version string for the EIP712 domain separator * @return Version string */ function version() external view returns (string memory) { return "2"; } }
/** * SPDX-License-Identifier: MIT * * 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 { FiatTokenV1_1 } from "../v1.1/FiatTokenV1_1.sol"; import { AbstractFiatTokenV2 } from "./AbstractFiatTokenV2.sol"; import { EIP712 } from "../util/EIP712.sol"; import { EIP712Domain } from "./EIP712Domain.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; 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 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 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 Expiration time, seconds since the epoch * @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 whenNotPaused notBlacklisted(owner) notBlacklisted(spender) { _permit(owner, spender, value, deadline, v, r, s); } /** * @notice 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)); } /** * @notice 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: MIT * * 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 { 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: MIT * * 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 { 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) 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 { ECRecover } from "./ECRecover.sol"; /** * @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 * @return Domain separator */ function makeDomainSeparator(string memory name, string memory version) internal view returns (bytes32) { uint256 chainId; assembly { chainId := chainid() } 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 Recover signer's address from a EIP712 signature * @param domainSeparator Domain separator * @param v v of the signature * @param r r of the signature * @param s s of the signature * @param typeHashAndData Type hash concatenated with data * @return Signer's address */ function recover( bytes32 domainSeparator, uint8 v, bytes32 r, bytes32 s, bytes memory typeHashAndData ) internal pure returns (address) { bytes32 digest = keccak256( abi.encodePacked( "\x19\x01", domainSeparator, keccak256(typeHashAndData) ) ); return ECRecover.recover(digest, v, r, s); } }
/** * SPDX-License-Identifier: MIT * * 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; /** * @title EIP712 Domain */ contract EIP712Domain { /** * @dev EIP712 Domain Separator */ bytes32 public DOMAIN_SEPARATOR; }
/** * SPDX-License-Identifier: MIT * * 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 { AbstractFiatTokenV2 } from "./AbstractFiatTokenV2.sol"; import { EIP712Domain } from "./EIP712Domain.sol"; import { EIP712 } from "../util/EIP712.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 { _requireValidAuthorization(from, nonce, validAfter, validBefore); bytes memory data = abi.encode( TRANSFER_WITH_AUTHORIZATION_TYPEHASH, from, to, value, validAfter, validBefore, nonce ); require( EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from, "FiatTokenV2: invalid 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 { require(to == msg.sender, "FiatTokenV2: caller must be the payee"); _requireValidAuthorization(from, nonce, validAfter, validBefore); bytes memory data = abi.encode( RECEIVE_WITH_AUTHORIZATION_TYPEHASH, from, to, value, validAfter, validBefore, nonce ); require( EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == from, "FiatTokenV2: invalid 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 { _requireUnusedAuthorization(authorizer, nonce); bytes memory data = abi.encode( CANCEL_AUTHORIZATION_TYPEHASH, authorizer, nonce ); require( EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == authorizer, "FiatTokenV2: invalid signature" ); _authorizationStates[authorizer][nonce] = true; emit AuthorizationCanceled(authorizer, nonce); } /** * @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: MIT * * 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 { AbstractFiatTokenV2 } from "./AbstractFiatTokenV2.sol"; import { EIP712Domain } from "./EIP712Domain.sol"; import { EIP712 } from "../util/EIP712.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 this expires (unix time) * @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 { require(deadline >= now, "FiatTokenV2: permit is expired"); bytes memory data = abi.encode( PERMIT_TYPEHASH, owner, spender, value, _permitNonces[owner]++, deadline ); require( EIP712.recover(DOMAIN_SEPARATOR, v, r, s, data) == owner, "EIP2612: invalid signature" ); _approve(owner, spender, value); } }
/** * SPDX-License-Identifier: MIT * * 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 { 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; mapping(address => uint256) internal balances; 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); 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"); _; } /** * @dev Function to mint tokens * @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 A boolean that indicates 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); balances[_to] = balances[_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" ); _; } /** * @dev Get minter allowance for an account * @param minter The address of the minter */ function minterAllowance(address minter) external view returns (uint256) { return minterAllowed[minter]; } /** * @dev Checks if account is a minter * @param account The address to check */ function isMinter(address account) external view returns (bool) { return minters[account]; } /** * @notice Amount of remaining tokens spender is allowed to transfer on * behalf of the token owner * @param owner Token owner's address * @param spender Spender's address * @return Allowance amount */ function allowance(address owner, address spender) external override view returns (uint256) { return allowed[owner][spender]; } /** * @dev Get totalSupply of token */ function totalSupply() external override view returns (uint256) { return totalSupply_; } /** * @dev Get token balance of an account * @param account address The account */ function balanceOf(address account) external override view returns (uint256) { return balances[account]; } /** * @notice Set spender's allowance over the caller's tokens to be a given * value. * @param spender Spender's address * @param value Allowance amount * @return True if successful */ function approve(address spender, uint256 value) external 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 Transfer tokens by spending allowance * @param from Payer's address * @param to Payee's address * @param value Transfer amount * @return True if 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 Transfer tokens from the caller * @param to Payee's address * @param value Transfer amount * @return True if successful */ function transfer(address to, uint256 value) external override whenNotPaused notBlacklisted(msg.sender) notBlacklisted(to) returns (bool) { _transfer(msg.sender, to, value); return true; } /** * @notice 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 <= balances[from], "ERC20: transfer amount exceeds balance" ); balances[from] = balances[from].sub(value); balances[to] = balances[to].add(value); emit Transfer(from, to, value); } /** * @dev Function to add/update a new minter * @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; } /** * @dev Function to remove 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; } /** * @dev allows a minter to burn some of its own tokens * Validates that caller is a minter and that sender is not blacklisted * amount is less than or equal to the minter's account balance * @param _amount uint256 the amount of tokens to be burned */ function burn(uint256 _amount) external whenNotPaused onlyMinters notBlacklisted(msg.sender) { uint256 balance = balances[msg.sender]; require(_amount > 0, "FiatToken: burn amount not greater than 0"); require(balance >= _amount, "FiatToken: burn amount exceeds balance"); totalSupply_ = totalSupply_.sub(_amount); balances[msg.sender] = balance.sub(_amount); emit Burn(msg.sender, _amount); emit Transfer(msg.sender, address(0), _amount); } function updateMasterMinter(address _newMasterMinter) external onlyOwner { require( _newMasterMinter != address(0), "FiatToken: new masterMinter is the zero address" ); masterMinter = _newMasterMinter; emit MasterMinterChanged(masterMinter); } }
/** * SPDX-License-Identifier: MIT * * 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 "../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 Assign the rescuer role to a given address. * @param newRescuer New rescuer's address */ 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: MIT pragma solidity ^0.6.0; /** * @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, 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) { return sub(a, b, "SafeMath: subtraction overflow"); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * 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); uint256 c = a - b; return c; } /** * @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) { // 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 0; } uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts 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) { return div(a, b, "SafeMath: division by zero"); } /** * @dev Returns the integer division of two unsigned integers. Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) { require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts 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) { return mod(a, b, "SafeMath: modulo by zero"); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message 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, string memory errorMessage) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } }
/** * SPDX-License-Identifier: MIT * * 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 { 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: 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: MIT * * Copyright (c) 2016 Smart Contract Solutions, Inc. * Copyright (c) 2018-2020 CENTRE SECZ0 * * 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(); } /** * @dev update the pauser role */ 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) 2018-2020 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"; /** * @title Blacklistable Token * @dev Allows accounts to be blacklisted by a "blacklister" role */ contract Blacklistable is Ownable { address public blacklister; mapping(address => bool) internal blacklisted; 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( !blacklisted[_account], "Blacklistable: account is blacklisted" ); _; } /** * @dev Checks if account is blacklisted * @param _account The address to check */ function isBlacklisted(address _account) external view returns (bool) { return blacklisted[_account]; } /** * @dev Adds account to blacklist * @param _account The address to blacklist */ function blacklist(address _account) external onlyBlacklister { blacklisted[_account] = true; emit Blacklisted(_account); } /** * @dev Removes account from blacklist * @param _account The address to remove from the blacklist */ function unBlacklist(address _account) external onlyBlacklister { blacklisted[_account] = false; emit UnBlacklisted(_account); } function updateBlacklister(address _newBlacklister) external onlyOwner { require( _newBlacklister != address(0), "Blacklistable: new blacklister is the zero address" ); blacklister = _newBlacklister; emit BlacklisterChanged(blacklister); } }
// SPDX-License-Identifier: MIT pragma solidity ^0.6.0; /** * @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; 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 ^0.6.2; /** * @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) { // According to EIP-1052, 0x0 is the value returned for not-yet created accounts // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned // for accounts without code, i.e. `keccak256('')` bytes32 codehash; bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; // solhint-disable-next-line no-inline-assembly assembly { codehash := extcodehash(account) } return (codehash != accountHash && codehash != 0x0); } /** * @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"); return _functionCallWithValue(target, data, value, errorMessage); } function _functionCallWithValue(address target, bytes memory data, uint256 weiValue, string memory errorMessage) private returns (bytes memory) { require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call{ value: weiValue }(data); 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 * * Copyright (c) 2016-2019 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; /** * @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; } }
{ "optimizer": { "enabled": true, "runs": 1000000 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
Contract Security Audit
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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":"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":"uint256","name":"newExchangeRate","type":"uint256"}],"name":"updateExchangeRate","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_newMasterMinter","type":"address"}],"name":"updateMasterMinter","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOracle","type":"address"}],"name":"updateOracle","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":"view","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.