ERC-20
Artificial Intelligence
Overview
Max Total Supply
9,870,903,732.814260600724258816 ALI
Holders
14,997 (0.00%)
Market
Price
$0.01 @ 0.000004 ETH (-2.67%)
Onchain Market Cap
$147,763,875.35
Circulating Supply Market Cap
$122,609,944.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
19,231.1565 ALIValue
$287.88 ( ~0.0719907075016188 Eth) [0.0002%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Contract Name:
AliERC20v2
Compiler Version
v0.8.7+commit.e28d00a7
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: MIT pragma solidity 0.8.7; import "../interfaces/ERC1363Spec.sol"; import "../interfaces/EIP2612.sol"; import "../interfaces/EIP3009.sol"; import "../utils/AccessControl.sol"; import "../lib/AddressUtils.sol"; import "../lib/ECDSA.sol"; /** * @title Artificial Liquid Intelligence ERC20 Token (Alethea, ALI) * * @notice ALI is the native utility token of the Alethea AI Protocol. * It serves as protocol currency, participates in iNFTs lifecycle, * (locked when iNFT is created, released when iNFT is destroyed, * consumed when iNFT is upgraded). * ALI token powers up the governance protocol (Alethea DAO) * * @notice Token Summary: * - Symbol: ALI * - Name: Artificial Liquid Intelligence Token * - Decimals: 18 * - Initial/maximum total supply: 10,000,000,000 ALI * - Initial supply holder (initial holder) address: // TODO: [DEFINE] * - Not mintable: new tokens cannot be created * - Burnable: existing tokens may get destroyed, total supply may decrease * - DAO Support: supports voting delegation * * @notice Features Summary: * - Supports atomic allowance modification, resolves well-known ERC20 issue with approve (arXiv:1907.00903) * - Voting delegation and delegation on behalf via EIP-712 (like in Compound CMP token) - gives ALI token * powerful governance capabilities by allowing holders to form voting groups by electing delegates * - Unlimited approval feature (like in 0x ZRX token) - saves gas for transfers on behalf * by eliminating the need to update “unlimited” allowance value * - ERC-1363 Payable Token - ERC721-like callback execution mechanism for transfers, * transfers on behalf and approvals; allows creation of smart contracts capable of executing callbacks * in response to transfer or approval in a single transaction * - EIP-2612: permit - 712-signed approvals - improves user experience by allowing to use a token * without having an ETH to pay gas fees * - EIP-3009: Transfer With Authorization - improves user experience by allowing to use a token * without having an ETH to pay gas fees * * @dev Even though smart contract has mint() function which is used to mint initial token supply, * the function is disabled forever after smart contract deployment by revoking `TOKEN_CREATOR` * permission from the deployer account * * @dev Token balances and total supply are effectively 192 bits long, meaning that maximum * possible total supply smart contract is able to track is 2^192 (close to 10^40 tokens) * * @dev Smart contract doesn't use safe math. All arithmetic operations are overflow/underflow safe. * Additionally, Solidity 0.8.7 enforces overflow/underflow safety. * * @dev Multiple Withdrawal Attack on ERC20 Tokens (arXiv:1907.00903) - resolved * Related events and functions are marked with "arXiv:1907.00903" tag: * - event Transfer(address indexed _by, address indexed _from, address indexed _to, uint256 _value) * - event Approve(address indexed _owner, address indexed _spender, uint256 _oldValue, uint256 _value) * - function increaseAllowance(address _spender, uint256 _value) public returns (bool) * - function decreaseAllowance(address _spender, uint256 _value) public returns (bool) * See: https://arxiv.org/abs/1907.00903v1 * https://ieeexplore.ieee.org/document/8802438 * See: https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * @dev Reviewed * ERC-20 - according to https://eips.ethereum.org/EIPS/eip-20 * ERC-1363 - according to https://eips.ethereum.org/EIPS/eip-1363 * EIP-2612 - according to https://eips.ethereum.org/EIPS/eip-2612 * EIP-3009 - according to https://eips.ethereum.org/EIPS/eip-3009 * * @dev ERC20: contract has passed * - OpenZeppelin ERC20 tests * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/test/token/ERC20/ERC20.behavior.js * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/test/token/ERC20/ERC20.test.js * - Ref ERC1363 tests * https://github.com/vittominacori/erc1363-payable-token/blob/master/test/token/ERC1363/ERC1363.behaviour.js * - OpenZeppelin EIP2612 tests * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/test/token/ERC20/extensions/draft-ERC20Permit.test.js * - Coinbase EIP3009 tests * https://github.com/CoinbaseStablecoin/eip-3009/blob/master/test/EIP3009.test.ts * - Compound voting delegation tests * https://github.com/compound-finance/compound-protocol/blob/master/tests/Governance/CompTest.js * https://github.com/compound-finance/compound-protocol/blob/master/tests/Utils/EIP712.js * - OpenZeppelin voting delegation tests * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/test/token/ERC20/extensions/ERC20Votes.test.js * See adopted copies of all the tests in the project test folder * * @dev Compound-like voting delegation functions', public getters', and events' names * were changed for better code readability (Alethea Name <- Comp/Zeppelin name): * - votingDelegates <- delegates * - votingPowerHistory <- checkpoints * - votingPowerHistoryLength <- numCheckpoints * - totalSupplyHistory <- _totalSupplyCheckpoints (private) * - usedNonces <- nonces (note: nonces are random instead of sequential) * - DelegateChanged (unchanged) * - VotingPowerChanged <- DelegateVotesChanged * - votingPowerOf <- getCurrentVotes * - votingPowerAt <- getPriorVotes * - totalSupplyAt <- getPriorTotalSupply * - delegate (unchanged) * - delegateWithAuthorization <- delegateBySig * @dev Compound-like voting delegation improved to allow the use of random nonces like in EIP-3009, * instead of sequential; same `usedNonces` EIP-3009 mapping is used to track nonces * * @dev Reference implementations "used": * - Atomic allowance: https://github.com/OpenZeppelin/openzeppelin-contracts * - Unlimited allowance: https://github.com/0xProject/protocol * - Voting delegation: https://github.com/compound-finance/compound-protocol * https://github.com/OpenZeppelin/openzeppelin-contracts * - ERC-1363: https://github.com/vittominacori/erc1363-payable-token * - EIP-2612: https://github.com/Uniswap/uniswap-v2-core * - EIP-3009: https://github.com/centrehq/centre-tokens * https://github.com/CoinbaseStablecoin/eip-3009 * - Meta transactions: https://github.com/0xProject/protocol * * @dev Includes resolutions for ALI ERC20 Audit by Miguel Palhas, https://hackmd.io/@naps62/alierc20-audit */ contract AliERC20v2 is ERC1363, EIP2612, EIP3009, AccessControl { /** * @dev Smart contract unique identifier, a random number * * @dev Should be regenerated each time smart contact source code is changed * and changes smart contract itself is to be redeployed * * @dev Generated using https://www.random.org/bytes/ */ uint256 public constant TOKEN_UID = 0x8d4fb97da97378ef7d0ad259aec651f42bd22c200159282baa58486bb390286b; /** * @notice Name of the token: Artificial Liquid Intelligence Token * * @notice ERC20 name of the token (long name) * * @dev ERC20 `function name() public view returns (string)` * * @dev Field is declared public: getter name() is created when compiled, * it returns the name of the token. */ string public constant name = "Artificial Liquid Intelligence Token"; /** * @notice Symbol of the token: ALI * * @notice ERC20 symbol of that token (short name) * * @dev ERC20 `function symbol() public view returns (string)` * * @dev Field is declared public: getter symbol() is created when compiled, * it returns the symbol of the token */ string public constant symbol = "ALI"; /** * @notice Decimals of the token: 18 * * @dev ERC20 `function decimals() public view returns (uint8)` * * @dev Field is declared public: getter decimals() is created when compiled, * it returns the number of decimals used to get its user representation. * For example, if `decimals` equals `6`, a balance of `1,500,000` tokens should * be displayed to a user as `1,5` (`1,500,000 / 10 ** 6`). * * @dev NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including balanceOf() and transfer(). */ uint8 public constant decimals = 18; /** * @notice Total supply of the token: initially 10,000,000,000, * with the potential to decline over time as some tokens may get burnt but not minted * * @dev ERC20 `function totalSupply() public view returns (uint256)` * * @dev Field is declared public: getter totalSupply() is created when compiled, * it returns the amount of tokens in existence. */ uint256 public override totalSupply; // is set to 10 billion * 10^18 in the constructor /** * @dev A record of all the token balances * @dev This mapping keeps record of all token owners: * owner => balance */ mapping(address => uint256) private tokenBalances; /** * @notice A record of each account's voting delegate * * @dev Auxiliary data structure used to sum up an account's voting power * * @dev This mapping keeps record of all voting power delegations: * voting delegator (token owner) => voting delegate */ mapping(address => address) public votingDelegates; /** * @notice Auxiliary structure to store key-value pair, used to store: * - voting power record (key: block.timestamp, value: voting power) * - total supply record (key: block.timestamp, value: total supply) * @notice A voting power record binds voting power of a delegate to a particular * block when the voting power delegation change happened * k: block.number when delegation has changed; starting from * that block voting power value is in effect * v: cumulative voting power a delegate has obtained starting * from the block stored in blockNumber * @notice Total supply record binds total token supply to a particular * block when total supply change happened (due to mint/burn operations) */ struct KV { /* * @dev key, a block number */ uint64 k; /* * @dev value, token balance or voting power */ uint192 v; } /** * @notice A record of each account's voting power historical data * * @dev Primarily data structure to store voting power for each account. * Voting power sums up from the account's token balance and delegated * balances. * * @dev Stores current value and entire history of its changes. * The changes are stored as an array of checkpoints (key-value pairs). * Checkpoint is an auxiliary data structure containing voting * power (number of votes) and block number when the checkpoint is saved * * @dev Maps voting delegate => voting power record */ mapping(address => KV[]) public votingPowerHistory; /** * @notice A record of total token supply historical data * * @dev Primarily data structure to store total token supply. * * @dev Stores current value and entire history of its changes. * The changes are stored as an array of checkpoints (key-value pairs). * Checkpoint is an auxiliary data structure containing total * token supply and block number when the checkpoint is saved */ KV[] public totalSupplyHistory; /** * @dev A record of nonces for signing/validating signatures in EIP-2612 `permit` * * @dev Note: EIP2612 doesn't imply a possibility for nonce randomization like in EIP-3009 * * @dev Maps delegate address => delegate nonce */ mapping(address => uint256) public override nonces; /** * @dev A record of used nonces for EIP-3009 transactions * * @dev A record of used nonces for signing/validating signatures * in `delegateWithAuthorization` for every delegate * * @dev Maps authorizer address => nonce => true/false (used unused) */ mapping(address => mapping(bytes32 => bool)) private usedNonces; /** * @notice A record of all the allowances to spend tokens on behalf * @dev Maps token owner address to an address approved to spend * some tokens on behalf, maps approved address to that amount * @dev owner => spender => value */ mapping(address => mapping(address => uint256)) private transferAllowances; /** * @notice Enables ERC20 transfers of the tokens * (transfer by the token owner himself) * @dev Feature FEATURE_TRANSFERS must be enabled in order for * `transfer()` function to succeed */ uint32 public constant FEATURE_TRANSFERS = 0x0000_0001; /** * @notice Enables ERC20 transfers on behalf * (transfer by someone else on behalf of token owner) * @dev Feature FEATURE_TRANSFERS_ON_BEHALF must be enabled in order for * `transferFrom()` function to succeed * @dev Token owner must call `approve()` first to authorize * the transfer on behalf */ uint32 public constant FEATURE_TRANSFERS_ON_BEHALF = 0x0000_0002; /** * @dev Defines if the default behavior of `transfer` and `transferFrom` * checks if the receiver smart contract supports ERC20 tokens * @dev When feature FEATURE_UNSAFE_TRANSFERS is enabled the transfers do not * check if the receiver smart contract supports ERC20 tokens, * i.e. `transfer` and `transferFrom` behave like `unsafeTransferFrom` * @dev When feature FEATURE_UNSAFE_TRANSFERS is disabled (default) the transfers * check if the receiver smart contract supports ERC20 tokens, * i.e. `transfer` and `transferFrom` behave like `transferFromAndCall` */ uint32 public constant FEATURE_UNSAFE_TRANSFERS = 0x0000_0004; /** * @notice Enables token owners to burn their own tokens * * @dev Feature FEATURE_OWN_BURNS must be enabled in order for * `burn()` function to succeed when called by token owner */ uint32 public constant FEATURE_OWN_BURNS = 0x0000_0008; /** * @notice Enables approved operators to burn tokens on behalf of their owners * * @dev Feature FEATURE_BURNS_ON_BEHALF must be enabled in order for * `burn()` function to succeed when called by approved operator */ uint32 public constant FEATURE_BURNS_ON_BEHALF = 0x0000_0010; /** * @notice Enables delegators to elect delegates * @dev Feature FEATURE_DELEGATIONS must be enabled in order for * `delegate()` function to succeed */ uint32 public constant FEATURE_DELEGATIONS = 0x0000_0020; /** * @notice Enables delegators to elect delegates on behalf * (via an EIP712 signature) * @dev Feature FEATURE_DELEGATIONS_ON_BEHALF must be enabled in order for * `delegateWithAuthorization()` function to succeed */ uint32 public constant FEATURE_DELEGATIONS_ON_BEHALF = 0x0000_0040; /** * @notice Enables ERC-1363 transfers with callback * @dev Feature FEATURE_ERC1363_TRANSFERS must be enabled in order for * ERC-1363 `transferFromAndCall` functions to succeed */ uint32 public constant FEATURE_ERC1363_TRANSFERS = 0x0000_0080; /** * @notice Enables ERC-1363 approvals with callback * @dev Feature FEATURE_ERC1363_APPROVALS must be enabled in order for * ERC-1363 `approveAndCall` functions to succeed */ uint32 public constant FEATURE_ERC1363_APPROVALS = 0x0000_0100; /** * @notice Enables approvals on behalf (EIP2612 permits * via an EIP712 signature) * @dev Feature FEATURE_EIP2612_PERMITS must be enabled in order for * `permit()` function to succeed */ uint32 public constant FEATURE_EIP2612_PERMITS = 0x0000_0200; /** * @notice Enables meta transfers on behalf (EIP3009 transfers * via an EIP712 signature) * @dev Feature FEATURE_EIP3009_TRANSFERS must be enabled in order for * `transferWithAuthorization()` function to succeed */ uint32 public constant FEATURE_EIP3009_TRANSFERS = 0x0000_0400; /** * @notice Enables meta transfers on behalf (EIP3009 transfers * via an EIP712 signature) * @dev Feature FEATURE_EIP3009_RECEPTIONS must be enabled in order for * `receiveWithAuthorization()` function to succeed */ uint32 public constant FEATURE_EIP3009_RECEPTIONS = 0x0000_0800; /** * @notice Token creator is responsible for creating (minting) * tokens to an arbitrary address * @dev Role ROLE_TOKEN_CREATOR allows minting tokens * (calling `mint` function) */ uint32 public constant ROLE_TOKEN_CREATOR = 0x0001_0000; /** * @notice Token destroyer is responsible for destroying (burning) * tokens owned by an arbitrary address * @dev Role ROLE_TOKEN_DESTROYER allows burning tokens * (calling `burn` function) */ uint32 public constant ROLE_TOKEN_DESTROYER = 0x0002_0000; /** * @notice ERC20 receivers are allowed to receive tokens without ERC20 safety checks, * which may be useful to simplify tokens transfers into "legacy" smart contracts * @dev When `FEATURE_UNSAFE_TRANSFERS` is not enabled addresses having * `ROLE_ERC20_RECEIVER` permission are allowed to receive tokens * via `transfer` and `transferFrom` functions in the same way they * would via `unsafeTransferFrom` function * @dev When `FEATURE_UNSAFE_TRANSFERS` is enabled `ROLE_ERC20_RECEIVER` permission * doesn't affect the transfer behaviour since * `transfer` and `transferFrom` behave like `unsafeTransferFrom` for any receiver * @dev ROLE_ERC20_RECEIVER is a shortening for ROLE_UNSAFE_ERC20_RECEIVER */ uint32 public constant ROLE_ERC20_RECEIVER = 0x0004_0000; /** * @notice ERC20 senders are allowed to send tokens without ERC20 safety checks, * which may be useful to simplify tokens transfers into "legacy" smart contracts * @dev When `FEATURE_UNSAFE_TRANSFERS` is not enabled senders having * `ROLE_ERC20_SENDER` permission are allowed to send tokens * via `transfer` and `transferFrom` functions in the same way they * would via `unsafeTransferFrom` function * @dev When `FEATURE_UNSAFE_TRANSFERS` is enabled `ROLE_ERC20_SENDER` permission * doesn't affect the transfer behaviour since * `transfer` and `transferFrom` behave like `unsafeTransferFrom` for any receiver * @dev ROLE_ERC20_SENDER is a shortening for ROLE_UNSAFE_ERC20_SENDER */ uint32 public constant ROLE_ERC20_SENDER = 0x0008_0000; /** * @notice EIP-712 contract's domain typeHash, * see https://eips.ethereum.org/EIPS/eip-712#rationale-for-typehash * * @dev Note: we do not include version into the domain typehash/separator, * it is implied version is concatenated to the name field, like "AliERC20v2" */ // keccak256("EIP712Domain(string name,uint256 chainId,address verifyingContract)") bytes32 public constant DOMAIN_TYPEHASH = 0x8cad95687ba82c2ce50e74f7b754645e5117c3a5bec8151c0726d5857980a866; /** * @notice EIP-712 contract's domain separator, * see https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator */ bytes32 public immutable override DOMAIN_SEPARATOR; /** * @notice EIP-712 delegation struct typeHash, * see https://eips.ethereum.org/EIPS/eip-712#rationale-for-typehash */ // keccak256("Delegation(address delegate,uint256 nonce,uint256 expiry)") bytes32 public constant DELEGATION_TYPEHASH = 0xff41620983935eb4d4a3c7384a066ca8c1d10cef9a5eca9eb97ca735cd14a755; /** * @notice EIP-712 permit (EIP-2612) struct typeHash, * see https://eips.ethereum.org/EIPS/eip-712#rationale-for-typehash */ // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)") bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9; /** * @notice EIP-712 TransferWithAuthorization (EIP-3009) struct typeHash, * see https://eips.ethereum.org/EIPS/eip-712#rationale-for-typehash */ // keccak256("TransferWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)") bytes32 public constant TRANSFER_WITH_AUTHORIZATION_TYPEHASH = 0x7c7c6cdb67a18743f49ec6fa9b35f50d52ed05cbed4cc592e13b44501c1a2267; /** * @notice EIP-712 ReceiveWithAuthorization (EIP-3009) struct typeHash, * see https://eips.ethereum.org/EIPS/eip-712#rationale-for-typehash */ // keccak256("ReceiveWithAuthorization(address from,address to,uint256 value,uint256 validAfter,uint256 validBefore,bytes32 nonce)") bytes32 public constant RECEIVE_WITH_AUTHORIZATION_TYPEHASH = 0xd099cc98ef71107a616c4f0f941f04c322d8e254fe26b3c6668db87aae413de8; /** * @notice EIP-712 CancelAuthorization (EIP-3009) struct typeHash, * see https://eips.ethereum.org/EIPS/eip-712#rationale-for-typehash */ // keccak256("CancelAuthorization(address authorizer,bytes32 nonce)") bytes32 public constant CANCEL_AUTHORIZATION_TYPEHASH = 0x158b0a9edf7a828aad02f63cd515c68ef2f50ba807396f6d12842833a1597429; /** * @dev Fired in mint() function * * @param by an address which minted some tokens (transaction sender) * @param to an address the tokens were minted to * @param value an amount of tokens minted */ event Minted(address indexed by, address indexed to, uint256 value); /** * @dev Fired in burn() function * * @param by an address which burned some tokens (transaction sender) * @param from an address the tokens were burnt from * @param value an amount of tokens burnt */ event Burnt(address indexed by, address indexed from, uint256 value); /** * @dev Resolution for the Multiple Withdrawal Attack on ERC20 Tokens (arXiv:1907.00903) * * @dev Similar to ERC20 Transfer event, but also logs an address which executed transfer * * @dev Fired in transfer(), transferFrom() and some other (non-ERC20) functions * * @param by an address which performed the transfer * @param from an address tokens were consumed from * @param to an address tokens were sent to * @param value number of tokens transferred */ event Transfer(address indexed by, address indexed from, address indexed to, uint256 value); /** * @dev Resolution for the Multiple Withdrawal Attack on ERC20 Tokens (arXiv:1907.00903) * * @dev Similar to ERC20 Approve event, but also logs old approval value * * @dev Fired in approve(), increaseAllowance(), decreaseAllowance() functions, * may get fired in transfer functions * * @param owner an address which granted a permission to transfer * tokens on its behalf * @param spender an address which received a permission to transfer * tokens on behalf of the owner `_owner` * @param oldValue previously granted amount of tokens to transfer on behalf * @param value new granted amount of tokens to transfer on behalf */ event Approval(address indexed owner, address indexed spender, uint256 oldValue, uint256 value); /** * @dev Notifies that a key-value pair in `votingDelegates` mapping has changed, * i.e. a delegator address has changed its delegate address * * @param source delegator address, a token owner, effectively transaction sender (`by`) * @param from old delegate, an address which delegate right is revoked * @param to new delegate, an address which received the voting power */ event DelegateChanged(address indexed source, address indexed from, address indexed to); /** * @dev Notifies that a key-value pair in `votingPowerHistory` mapping has changed, * i.e. a delegate's voting power has changed. * * @param by an address which executed delegate, mint, burn, or transfer operation * which had led to delegate voting power change * @param target delegate whose voting power has changed * @param fromVal previous number of votes delegate had * @param toVal new number of votes delegate has */ event VotingPowerChanged(address indexed by, address indexed target, uint256 fromVal, uint256 toVal); /** * @dev Deploys the token smart contract, * assigns initial token supply to the address specified * * @param _initialHolder owner of the initial token supply */ constructor(address _initialHolder) { // verify initial holder address non-zero (is set) require(_initialHolder != address(0), "_initialHolder not set (zero address)"); // build the EIP-712 contract domain separator, see https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator // note: we specify contract version in its name DOMAIN_SEPARATOR = keccak256(abi.encode(DOMAIN_TYPEHASH, keccak256(bytes("AliERC20v2")), block.chainid, address(this))); // mint initial supply mint(_initialHolder, 10_000_000_000e18); } /** * @inheritdoc ERC165 */ function supportsInterface(bytes4 interfaceId) public pure override returns (bool) { // reconstruct from current interface(s) and super interface(s) (if any) return interfaceId == type(ERC165).interfaceId || interfaceId == type(ERC20).interfaceId || interfaceId == type(ERC1363).interfaceId || interfaceId == type(EIP2612).interfaceId || interfaceId == type(EIP3009).interfaceId; } // ===== Start: ERC-1363 functions ===== /** * @notice Transfers some tokens and then executes `onTransferReceived` callback on the receiver * * @inheritdoc ERC1363 * * @dev Called by token owner (an address which has a * positive token balance tracked by this smart contract) * @dev Throws on any error like * * insufficient token balance or * * incorrect `_to` address: * * zero address or * * same as `_from` address (self transfer) * * EOA or smart contract which doesn't support ERC1363Receiver interface * @dev Returns true on success, throws otherwise * * @param _to an address to transfer tokens to, * must be a smart contract, implementing ERC1363Receiver * @param _value amount of tokens to be transferred,, zero * value is allowed * @return true unless throwing */ function transferAndCall(address _to, uint256 _value) public override returns (bool) { // delegate to `transferFromAndCall` passing `msg.sender` as `_from` return transferFromAndCall(msg.sender, _to, _value); } /** * @notice Transfers some tokens and then executes `onTransferReceived` callback on the receiver * * @inheritdoc ERC1363 * * @dev Called by token owner (an address which has a * positive token balance tracked by this smart contract) * @dev Throws on any error like * * insufficient token balance or * * incorrect `_to` address: * * zero address or * * same as `_from` address (self transfer) * * EOA or smart contract which doesn't support ERC1363Receiver interface * @dev Returns true on success, throws otherwise * * @param _to an address to transfer tokens to, * must be a smart contract, implementing ERC1363Receiver * @param _value amount of tokens to be transferred,, zero * value is allowed * @param _data [optional] additional data with no specified format, * sent in onTransferReceived call to `_to` * @return true unless throwing */ function transferAndCall(address _to, uint256 _value, bytes memory _data) public override returns (bool) { // delegate to `transferFromAndCall` passing `msg.sender` as `_from` return transferFromAndCall(msg.sender, _to, _value, _data); } /** * @notice Transfers some tokens on behalf of address `_from' (token owner) * to some other address `_to` and then executes `onTransferReceived` callback on the receiver * * @inheritdoc ERC1363 * * @dev Called by token owner on his own or approved address, * an address approved earlier by token owner to * transfer some amount of tokens on its behalf * @dev Throws on any error like * * insufficient token balance or * * incorrect `_to` address: * * zero address or * * same as `_from` address (self transfer) * * EOA or smart contract which doesn't support ERC1363Receiver interface * @dev Returns true on success, throws otherwise * * @param _from token owner which approved caller (transaction sender) * to transfer `_value` of tokens on its behalf * @param _to an address to transfer tokens to, * must be a smart contract, implementing ERC1363Receiver * @param _value amount of tokens to be transferred,, zero * value is allowed * @return true unless throwing */ function transferFromAndCall(address _from, address _to, uint256 _value) public override returns (bool) { // delegate to `transferFromAndCall` passing empty data param return transferFromAndCall(_from, _to, _value, ""); } /** * @notice Transfers some tokens on behalf of address `_from' (token owner) * to some other address `_to` and then executes a `onTransferReceived` callback on the receiver * * @inheritdoc ERC1363 * * @dev Called by token owner on his own or approved address, * an address approved earlier by token owner to * transfer some amount of tokens on its behalf * @dev Throws on any error like * * insufficient token balance or * * incorrect `_to` address: * * zero address or * * same as `_from` address (self transfer) * * EOA or smart contract which doesn't support ERC1363Receiver interface * @dev Returns true on success, throws otherwise * * @param _from token owner which approved caller (transaction sender) * to transfer `_value` of tokens on its behalf * @param _to an address to transfer tokens to, * must be a smart contract, implementing ERC1363Receiver * @param _value amount of tokens to be transferred,, zero * value is allowed * @param _data [optional] additional data with no specified format, * sent in onTransferReceived call to `_to` * @return true unless throwing */ function transferFromAndCall(address _from, address _to, uint256 _value, bytes memory _data) public override returns (bool) { // ensure ERC-1363 transfers are enabled require(isFeatureEnabled(FEATURE_ERC1363_TRANSFERS), "ERC1363 transfers are disabled"); // first delegate call to `unsafeTransferFrom` to perform the unsafe token(s) transfer unsafeTransferFrom(_from, _to, _value); // after the successful transfer - check if receiver supports // ERC1363Receiver and execute a callback handler `onTransferReceived`, // reverting whole transaction on any error _notifyTransferred(_from, _to, _value, _data, false); // function throws on any error, so if we're here - it means operation successful, just return true return true; } /** * @notice Approves address called `_spender` to transfer some amount * of tokens on behalf of the owner, then executes a `onApprovalReceived` callback on `_spender` * * @inheritdoc ERC1363 * * @dev Caller must not necessarily own any tokens to grant the permission * * @dev Throws if `_spender` is an EOA or a smart contract which doesn't support ERC1363Spender interface * * @param _spender an address approved by the caller (token owner) * to spend some tokens on its behalf * @param _value an amount of tokens spender `_spender` is allowed to * transfer on behalf of the token owner * @return success true on success, throws otherwise */ function approveAndCall(address _spender, uint256 _value) public override returns (bool) { // delegate to `approveAndCall` passing empty data return approveAndCall(_spender, _value, ""); } /** * @notice Approves address called `_spender` to transfer some amount * of tokens on behalf of the owner, then executes a callback on `_spender` * * @inheritdoc ERC1363 * * @dev Caller must not necessarily own any tokens to grant the permission * * @param _spender an address approved by the caller (token owner) * to spend some tokens on its behalf * @param _value an amount of tokens spender `_spender` is allowed to * transfer on behalf of the token owner * @param _data [optional] additional data with no specified format, * sent in onApprovalReceived call to `_spender` * @return success true on success, throws otherwise */ function approveAndCall(address _spender, uint256 _value, bytes memory _data) public override returns (bool) { // ensure ERC-1363 approvals are enabled require(isFeatureEnabled(FEATURE_ERC1363_APPROVALS), "ERC1363 approvals are disabled"); // execute regular ERC20 approve - delegate to `approve` approve(_spender, _value); // after the successful approve - check if receiver supports // ERC1363Spender and execute a callback handler `onApprovalReceived`, // reverting whole transaction on any error _notifyApproved(_spender, _value, _data); // function throws on any error, so if we're here - it means operation successful, just return true return true; } /** * @dev Auxiliary function to invoke `onTransferReceived` on a target address * The call is not executed if the target address is not a contract; in such * a case function throws if `allowEoa` is set to false, succeeds if it's true * * @dev Throws on any error; returns silently on success * * @param _from representing the previous owner of the given token value * @param _to target address that will receive the tokens * @param _value the amount mount of tokens to be transferred * @param _data [optional] data to send along with the call * @param allowEoa indicates if function should fail if `_to` is an EOA */ function _notifyTransferred(address _from, address _to, uint256 _value, bytes memory _data, bool allowEoa) private { // if recipient `_to` is EOA if (!AddressUtils.isContract(_to)) { // ensure EOA recipient is allowed require(allowEoa, "EOA recipient"); // exit if successful return; } // otherwise - if `_to` is a contract - execute onTransferReceived bytes4 response = ERC1363Receiver(_to).onTransferReceived(msg.sender, _from, _value, _data); // expected response is ERC1363Receiver(_to).onTransferReceived.selector // bytes4(keccak256("onTransferReceived(address,address,uint256,bytes)")) require(response == ERC1363Receiver(_to).onTransferReceived.selector, "invalid onTransferReceived response"); } /** * @dev Auxiliary function to invoke `onApprovalReceived` on a target address * The call is not executed if the target address is not a contract; in such * a case function throws if `allowEoa` is set to false, succeeds if it's true * * @dev Throws on any error; returns silently on success * * @param _spender the address which will spend the funds * @param _value the amount of tokens to be spent * @param _data [optional] data to send along with the call */ function _notifyApproved(address _spender, uint256 _value, bytes memory _data) private { // ensure recipient is not EOA require(AddressUtils.isContract(_spender), "EOA spender"); // otherwise - if `_to` is a contract - execute onApprovalReceived bytes4 response = ERC1363Spender(_spender).onApprovalReceived(msg.sender, _value, _data); // expected response is ERC1363Spender(_to).onApprovalReceived.selector // bytes4(keccak256("onApprovalReceived(address,uint256,bytes)")) require(response == ERC1363Spender(_spender).onApprovalReceived.selector, "invalid onApprovalReceived response"); } // ===== End: ERC-1363 functions ===== // ===== Start: ERC20 functions ===== /** * @notice Gets the balance of a particular address * * @inheritdoc ERC20 * * @param _owner the address to query the the balance for * @return balance an amount of tokens owned by the address specified */ function balanceOf(address _owner) public view override returns (uint256 balance) { // read the balance and return return tokenBalances[_owner]; } /** * @notice Transfers some tokens to an external address or a smart contract * * @inheritdoc ERC20 * * @dev Called by token owner (an address which has a * positive token balance tracked by this smart contract) * @dev Throws on any error like * * insufficient token balance or * * incorrect `_to` address: * * zero address or * * self address or * * smart contract which doesn't support ERC20 * * @param _to an address to transfer tokens to, * must be either an external address or a smart contract, * compliant with the ERC20 standard * @param _value amount of tokens to be transferred,, zero * value is allowed * @return success true on success, throws otherwise */ function transfer(address _to, uint256 _value) public override returns (bool success) { // just delegate call to `transferFrom`, // `FEATURE_TRANSFERS` is verified inside it return transferFrom(msg.sender, _to, _value); } /** * @notice Transfers some tokens on behalf of address `_from' (token owner) * to some other address `_to` * * @inheritdoc ERC20 * * @dev Called by token owner on his own or approved address, * an address approved earlier by token owner to * transfer some amount of tokens on its behalf * @dev Throws on any error like * * insufficient token balance or * * incorrect `_to` address: * * zero address or * * same as `_from` address (self transfer) * * smart contract which doesn't support ERC20 * * @param _from token owner which approved caller (transaction sender) * to transfer `_value` of tokens on its behalf * @param _to an address to transfer tokens to, * must be either an external address or a smart contract, * compliant with the ERC20 standard * @param _value amount of tokens to be transferred,, zero * value is allowed * @return success true on success, throws otherwise */ function transferFrom(address _from, address _to, uint256 _value) public override returns (bool success) { // depending on `FEATURE_UNSAFE_TRANSFERS` we execute either safe (default) // or unsafe transfer // if `FEATURE_UNSAFE_TRANSFERS` is enabled // or receiver has `ROLE_ERC20_RECEIVER` permission // or sender has `ROLE_ERC20_SENDER` permission if(isFeatureEnabled(FEATURE_UNSAFE_TRANSFERS) || isOperatorInRole(_to, ROLE_ERC20_RECEIVER) || isSenderInRole(ROLE_ERC20_SENDER)) { // we execute unsafe transfer - delegate call to `unsafeTransferFrom`, // `FEATURE_TRANSFERS` is verified inside it unsafeTransferFrom(_from, _to, _value); } // otherwise - if `FEATURE_UNSAFE_TRANSFERS` is disabled // and receiver doesn't have `ROLE_ERC20_RECEIVER` permission else { // we execute safe transfer - delegate call to `safeTransferFrom`, passing empty `_data`, // `FEATURE_TRANSFERS` is verified inside it safeTransferFrom(_from, _to, _value, ""); } // both `unsafeTransferFrom` and `safeTransferFrom` throw on any error, so // if we're here - it means operation successful, // just return true return true; } /** * @notice Transfers some tokens on behalf of address `_from' (token owner) * to some other address `_to` and then executes `onTransferReceived` callback * on the receiver if it is a smart contract (not an EOA) * * @dev Called by token owner on his own or approved address, * an address approved earlier by token owner to * transfer some amount of tokens on its behalf * @dev Throws on any error like * * insufficient token balance or * * incorrect `_to` address: * * zero address or * * same as `_from` address (self transfer) * * smart contract which doesn't support ERC1363Receiver interface * @dev Returns true on success, throws otherwise * * @param _from token owner which approved caller (transaction sender) * to transfer `_value` of tokens on its behalf * @param _to an address to transfer tokens to, * must be either an external address or a smart contract, * implementing ERC1363Receiver * @param _value amount of tokens to be transferred,, zero * value is allowed * @param _data [optional] additional data with no specified format, * sent in onTransferReceived call to `_to` in case if its a smart contract * @return true unless throwing */ function safeTransferFrom(address _from, address _to, uint256 _value, bytes memory _data) public returns (bool) { // first delegate call to `unsafeTransferFrom` to perform the unsafe token(s) transfer unsafeTransferFrom(_from, _to, _value); // after the successful transfer - check if receiver supports // ERC1363Receiver and execute a callback handler `onTransferReceived`, // reverting whole transaction on any error _notifyTransferred(_from, _to, _value, _data, true); // function throws on any error, so if we're here - it means operation successful, just return true return true; } /** * @notice Transfers some tokens on behalf of address `_from' (token owner) * to some other address `_to` * * @dev In contrast to `transferFromAndCall` doesn't check recipient * smart contract to support ERC20 tokens (ERC1363Receiver) * @dev Designed to be used by developers when the receiver is known * to support ERC20 tokens but doesn't implement ERC1363Receiver interface * @dev Called by token owner on his own or approved address, * an address approved earlier by token owner to * transfer some amount of tokens on its behalf * @dev Throws on any error like * * insufficient token balance or * * incorrect `_to` address: * * zero address or * * same as `_from` address (self transfer) * @dev Returns silently on success, throws otherwise * * @param _from token sender, token owner which approved caller (transaction sender) * to transfer `_value` of tokens on its behalf * @param _to token receiver, an address to transfer tokens to * @param _value amount of tokens to be transferred,, zero * value is allowed */ function unsafeTransferFrom(address _from, address _to, uint256 _value) public { // make an internal transferFrom - delegate to `__transferFrom` __transferFrom(msg.sender, _from, _to, _value); } /** * @dev Powers the meta transactions for `unsafeTransferFrom` - EIP-3009 `transferWithAuthorization` * and `receiveWithAuthorization` * * @dev See `unsafeTransferFrom` and `transferFrom` soldoc for details * * @param _by an address executing the transfer, it can be token owner itself, * or an operator previously approved with `approve()` * @param _from token sender, token owner which approved caller (transaction sender) * to transfer `_value` of tokens on its behalf * @param _to token receiver, an address to transfer tokens to * @param _value amount of tokens to be transferred,, zero * value is allowed */ function __transferFrom(address _by, address _from, address _to, uint256 _value) private { // if `_from` is equal to sender, require transfers feature to be enabled // otherwise require transfers on behalf feature to be enabled require(_from == _by && isFeatureEnabled(FEATURE_TRANSFERS) || _from != _by && isFeatureEnabled(FEATURE_TRANSFERS_ON_BEHALF), _from == _by? "transfers are disabled": "transfers on behalf are disabled"); // non-zero source address check - Zeppelin // obviously, zero source address is a client mistake // it's not part of ERC20 standard but it's reasonable to fail fast // since for zero value transfer transaction succeeds otherwise require(_from != address(0), "transfer from the zero address"); // non-zero recipient address check require(_to != address(0), "transfer to the zero address"); // sender and recipient cannot be the same require(_from != _to, "sender and recipient are the same (_from = _to)"); // sending tokens to the token smart contract itself is a client mistake require(_to != address(this), "invalid recipient (transfer to the token smart contract itself)"); // according to ERC-20 Token Standard, https://eips.ethereum.org/EIPS/eip-20 // "Transfers of 0 values MUST be treated as normal transfers and fire the Transfer event." if(_value == 0) { // emit an ERC20 transfer event emit Transfer(_from, _to, _value); // don't forget to return - we're done return; } // no need to make arithmetic overflow check on the _value - by design of mint() // in case of transfer on behalf if(_from != _by) { // read allowance value - the amount of tokens allowed to transfer - into the stack uint256 _allowance = transferAllowances[_from][_by]; // verify sender has an allowance to transfer amount of tokens requested require(_allowance >= _value, "transfer amount exceeds allowance"); // we treat max uint256 allowance value as an "unlimited" and // do not decrease allowance when it is set to "unlimited" value if(_allowance < type(uint256).max) { // update allowance value on the stack _allowance -= _value; // update the allowance value in storage transferAllowances[_from][_by] = _allowance; // emit an improved atomic approve event emit Approval(_from, _by, _allowance + _value, _allowance); // emit an ERC20 approval event to reflect the decrease emit Approval(_from, _by, _allowance); } } // verify sender has enough tokens to transfer on behalf require(tokenBalances[_from] >= _value, "transfer amount exceeds balance"); // perform the transfer: // decrease token owner (sender) balance tokenBalances[_from] -= _value; // increase `_to` address (receiver) balance tokenBalances[_to] += _value; // move voting power associated with the tokens transferred __moveVotingPower(_by, votingDelegates[_from], votingDelegates[_to], _value); // emit an improved transfer event (arXiv:1907.00903) emit Transfer(_by, _from, _to, _value); // emit an ERC20 transfer event emit Transfer(_from, _to, _value); } /** * @notice Approves address called `_spender` to transfer some amount * of tokens on behalf of the owner (transaction sender) * * @inheritdoc ERC20 * * @dev Transaction sender must not necessarily own any tokens to grant the permission * * @param _spender an address approved by the caller (token owner) * to spend some tokens on its behalf * @param _value an amount of tokens spender `_spender` is allowed to * transfer on behalf of the token owner * @return success true on success, throws otherwise */ function approve(address _spender, uint256 _value) public override returns (bool success) { // make an internal approve - delegate to `__approve` __approve(msg.sender, _spender, _value); // operation successful, return true return true; } /** * @dev Powers the meta transaction for `approve` - EIP-2612 `permit` * * @dev Approves address called `_spender` to transfer some amount * of tokens on behalf of the `_owner` * * @dev `_owner` must not necessarily own any tokens to grant the permission * @dev Throws if `_spender` is a zero address * * @param _owner owner of the tokens to set approval on behalf of * @param _spender an address approved by the token owner * to spend some tokens on its behalf * @param _value an amount of tokens spender `_spender` is allowed to * transfer on behalf of the token owner */ function __approve(address _owner, address _spender, uint256 _value) private { // non-zero spender address check - Zeppelin // obviously, zero spender address is a client mistake // it's not part of ERC20 standard but it's reasonable to fail fast require(_spender != address(0), "approve to the zero address"); // read old approval value to emmit an improved event (arXiv:1907.00903) uint256 _oldValue = transferAllowances[_owner][_spender]; // perform an operation: write value requested into the storage transferAllowances[_owner][_spender] = _value; // emit an improved atomic approve event (arXiv:1907.00903) emit Approval(_owner, _spender, _oldValue, _value); // emit an ERC20 approval event emit Approval(_owner, _spender, _value); } /** * @notice Returns the amount which _spender is still allowed to withdraw from _owner. * * @inheritdoc ERC20 * * @dev A function to check an amount of tokens owner approved * to transfer on its behalf by some other address called "spender" * * @param _owner an address which approves transferring some tokens on its behalf * @param _spender an address approved to transfer some tokens on behalf * @return remaining an amount of tokens approved address `_spender` can transfer on behalf * of token owner `_owner` */ function allowance(address _owner, address _spender) public view override returns (uint256 remaining) { // read the value from storage and return return transferAllowances[_owner][_spender]; } // ===== End: ERC20 functions ===== // ===== Start: Resolution for the Multiple Withdrawal Attack on ERC20 Tokens (arXiv:1907.00903) ===== /** * @notice Increases the allowance granted to `spender` by the transaction sender * * @dev Resolution for the Multiple Withdrawal Attack on ERC20 Tokens (arXiv:1907.00903) * * @dev Throws if value to increase by is zero or too big and causes arithmetic overflow * * @param _spender an address approved by the caller (token owner) * to spend some tokens on its behalf * @param _value an amount of tokens to increase by * @return success true on success, throws otherwise */ function increaseAllowance(address _spender, uint256 _value) public returns (bool) { // read current allowance value uint256 currentVal = transferAllowances[msg.sender][_spender]; // non-zero _value and arithmetic overflow check on the allowance unchecked { // put operation into unchecked block to display user-friendly overflow error message for Solidity 0.8+ require(currentVal + _value > currentVal, "zero value approval increase or arithmetic overflow"); } // delegate call to `approve` with the new value return approve(_spender, currentVal + _value); } /** * @notice Decreases the allowance granted to `spender` by the caller. * * @dev Resolution for the Multiple Withdrawal Attack on ERC20 Tokens (arXiv:1907.00903) * * @dev Throws if value to decrease by is zero or is greater than currently allowed value * * @param _spender an address approved by the caller (token owner) * to spend some tokens on its behalf * @param _value an amount of tokens to decrease by * @return success true on success, throws otherwise */ function decreaseAllowance(address _spender, uint256 _value) public returns (bool) { // read current allowance value uint256 currentVal = transferAllowances[msg.sender][_spender]; // non-zero _value check on the allowance require(_value > 0, "zero value approval decrease"); // verify allowance decrease doesn't underflow require(currentVal >= _value, "ERC20: decreased allowance below zero"); // delegate call to `approve` with the new value return approve(_spender, currentVal - _value); } // ===== End: Resolution for the Multiple Withdrawal Attack on ERC20 Tokens (arXiv:1907.00903) ===== // ===== Start: Minting/burning extension ===== /** * @dev Mints (creates) some tokens to address specified * @dev The value specified is treated as is without taking * into account what `decimals` value is * * @dev Requires executor to have `ROLE_TOKEN_CREATOR` permission * * @dev Throws on overflow, if totalSupply + _value doesn't fit into uint256 * * @param _to an address to mint tokens to * @param _value an amount of tokens to mint (create) */ function mint(address _to, uint256 _value) public { // check if caller has sufficient permissions to mint tokens require(isSenderInRole(ROLE_TOKEN_CREATOR), "access denied"); // non-zero recipient address check require(_to != address(0), "zero address"); // non-zero _value and arithmetic overflow check on the total supply // this check automatically secures arithmetic overflow on the individual balance unchecked { // put operation into unchecked block to display user-friendly overflow error message for Solidity 0.8+ require(totalSupply + _value > totalSupply, "zero value or arithmetic overflow"); } // uint192 overflow check (required by voting delegation) require(totalSupply + _value <= type(uint192).max, "total supply overflow (uint192)"); // perform mint: // increase total amount of tokens value totalSupply += _value; // increase `_to` address balance tokenBalances[_to] += _value; // update total token supply history __updateHistory(totalSupplyHistory, add, _value); // create voting power associated with the tokens minted __moveVotingPower(msg.sender, address(0), votingDelegates[_to], _value); // fire a minted event emit Minted(msg.sender, _to, _value); // emit an improved transfer event (arXiv:1907.00903) emit Transfer(msg.sender, address(0), _to, _value); // fire ERC20 compliant transfer event emit Transfer(address(0), _to, _value); } /** * @dev Burns (destroys) some tokens from the address specified * * @dev The value specified is treated as is without taking * into account what `decimals` value is * * @dev Requires executor to have `ROLE_TOKEN_DESTROYER` permission * or FEATURE_OWN_BURNS/FEATURE_BURNS_ON_BEHALF features to be enabled * * @dev Can be disabled by the contract creator forever by disabling * FEATURE_OWN_BURNS/FEATURE_BURNS_ON_BEHALF features and then revoking * its own roles to burn tokens and to enable burning features * * @param _from an address to burn some tokens from * @param _value an amount of tokens to burn (destroy) */ function burn(address _from, uint256 _value) public { // check if caller has sufficient permissions to burn tokens // and if not - check for possibility to burn own tokens or to burn on behalf if(!isSenderInRole(ROLE_TOKEN_DESTROYER)) { // if `_from` is equal to sender, require own burns feature to be enabled // otherwise require burns on behalf feature to be enabled require(_from == msg.sender && isFeatureEnabled(FEATURE_OWN_BURNS) || _from != msg.sender && isFeatureEnabled(FEATURE_BURNS_ON_BEHALF), _from == msg.sender? "burns are disabled": "burns on behalf are disabled"); // in case of burn on behalf if(_from != msg.sender) { // read allowance value - the amount of tokens allowed to be burnt - into the stack uint256 _allowance = transferAllowances[_from][msg.sender]; // verify sender has an allowance to burn amount of tokens requested require(_allowance >= _value, "burn amount exceeds allowance"); // we treat max uint256 allowance value as an "unlimited" and // do not decrease allowance when it is set to "unlimited" value if(_allowance < type(uint256).max) { // update allowance value on the stack _allowance -= _value; // update the allowance value in storage transferAllowances[_from][msg.sender] = _allowance; // emit an improved atomic approve event (arXiv:1907.00903) emit Approval(msg.sender, _from, _allowance + _value, _allowance); // emit an ERC20 approval event to reflect the decrease emit Approval(_from, msg.sender, _allowance); } } } // at this point we know that either sender is ROLE_TOKEN_DESTROYER or // we burn own tokens or on behalf (in latest case we already checked and updated allowances) // we have left to execute balance checks and burning logic itself // non-zero burn value check require(_value != 0, "zero value burn"); // non-zero source address check - Zeppelin require(_from != address(0), "burn from the zero address"); // verify `_from` address has enough tokens to destroy // (basically this is a arithmetic overflow check) require(tokenBalances[_from] >= _value, "burn amount exceeds balance"); // perform burn: // decrease `_from` address balance tokenBalances[_from] -= _value; // decrease total amount of tokens value totalSupply -= _value; // update total token supply history __updateHistory(totalSupplyHistory, sub, _value); // destroy voting power associated with the tokens burnt __moveVotingPower(msg.sender, votingDelegates[_from], address(0), _value); // fire a burnt event emit Burnt(msg.sender, _from, _value); // emit an improved transfer event (arXiv:1907.00903) emit Transfer(msg.sender, _from, address(0), _value); // fire ERC20 compliant transfer event emit Transfer(_from, address(0), _value); } // ===== End: Minting/burning extension ===== // ===== Start: EIP-2612 functions ===== /** * @inheritdoc EIP2612 * * @dev Executes approve(_spender, _value) on behalf of the owner who EIP-712 * signed the transaction, i.e. as if transaction sender is the EIP712 signer * * @dev Sets the `_value` as the allowance of `_spender` over `_owner` tokens, * given `_owner` EIP-712 signed approval * * @dev Inherits the Multiple Withdrawal Attack on ERC20 Tokens (arXiv:1907.00903) * vulnerability in the same way as ERC20 `approve`, use standard ERC20 workaround * if this might become an issue: * https://docs.google.com/document/d/1YLPtQxZu1UAvO9cZ1O2RPXBbT0mooh4DYKjA_jp-RLM/edit * * @dev Emits `Approval` event(s) in the same way as `approve` does * * @dev Requires: * - `_spender` to be non-zero address * - `_exp` to be a timestamp in the future * - `v`, `r` and `s` to be a valid `secp256k1` signature from `_owner` * over the EIP712-formatted function arguments. * - the signature to use `_owner` current nonce (see `nonces`). * * @dev For more information on the signature format, see the * https://eips.ethereum.org/EIPS/eip-2612#specification * * @param _owner owner of the tokens to set approval on behalf of, * an address which signed the EIP-712 message * @param _spender an address approved by the token owner * to spend some tokens on its behalf * @param _value an amount of tokens spender `_spender` is allowed to * transfer on behalf of the token owner * @param _exp signature expiration time (unix timestamp) * @param v the recovery byte of the signature * @param r half of the ECDSA signature pair * @param s half of the ECDSA signature pair */ function permit(address _owner, address _spender, uint256 _value, uint256 _exp, uint8 v, bytes32 r, bytes32 s) public override { // verify permits are enabled require(isFeatureEnabled(FEATURE_EIP2612_PERMITS), "EIP2612 permits are disabled"); // derive signer of the EIP712 Permit message, and // update the nonce for that particular signer to avoid replay attack!!! --------->>> ↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓ address signer = __deriveSigner(abi.encode(PERMIT_TYPEHASH, _owner, _spender, _value, nonces[_owner]++, _exp), v, r, s); // perform message integrity and security validations require(signer == _owner, "invalid signature"); require(block.timestamp < _exp, "signature expired"); // delegate call to `__approve` - execute the logic required __approve(_owner, _spender, _value); } // ===== End: EIP-2612 functions ===== // ===== Start: EIP-3009 functions ===== /** * @inheritdoc EIP3009 * * @notice Checks if specified nonce was already used * * @dev Nonces are expected to be client-side randomly generated 32-byte values * unique to the authorizer's address * * @dev Alias for usedNonces(authorizer, nonce) * * @param _authorizer an address to check nonce for * @param _nonce a nonce to check * @return true if the nonce was used, false otherwise */ function authorizationState(address _authorizer, bytes32 _nonce) public override view returns (bool) { // simply return the value from the mapping return usedNonces[_authorizer][_nonce]; } /** * @inheritdoc EIP3009 * * @notice Execute a transfer with a signed authorization * * @param _from token sender and transaction authorizer * @param _to token receiver * @param _value amount to be transferred * @param _validAfter signature valid after time (unix timestamp) * @param _validBefore signature valid before time (unix timestamp) * @param _nonce unique random nonce * @param v the recovery byte of the signature * @param r half of the ECDSA signature pair * @param s half of the ECDSA signature pair */ function transferWithAuthorization( address _from, address _to, uint256 _value, uint256 _validAfter, uint256 _validBefore, bytes32 _nonce, uint8 v, bytes32 r, bytes32 s ) public override { // ensure EIP-3009 transfers are enabled require(isFeatureEnabled(FEATURE_EIP3009_TRANSFERS), "EIP3009 transfers are disabled"); // derive signer of the EIP712 TransferWithAuthorization message address signer = __deriveSigner(abi.encode(TRANSFER_WITH_AUTHORIZATION_TYPEHASH, _from, _to, _value, _validAfter, _validBefore, _nonce), v, r, s); // perform message integrity and security validations require(signer == _from, "invalid signature"); require(block.timestamp > _validAfter, "signature not yet valid"); require(block.timestamp < _validBefore, "signature expired"); // use the nonce supplied (verify, mark as used, emit event) __useNonce(_from, _nonce, false); // delegate call to `__transferFrom` - execute the logic required __transferFrom(signer, _from, _to, _value); } /** * @inheritdoc EIP3009 * * @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 token sender and transaction authorizer * @param _to token receiver * @param _value amount to be transferred * @param _validAfter signature valid after time (unix timestamp) * @param _validBefore signature valid before time (unix timestamp) * @param _nonce unique random nonce * @param v the recovery byte of the signature * @param r half of the ECDSA signature pair * @param s half of the ECDSA signature pair */ function receiveWithAuthorization( address _from, address _to, uint256 _value, uint256 _validAfter, uint256 _validBefore, bytes32 _nonce, uint8 v, bytes32 r, bytes32 s ) public override { // verify EIP3009 receptions are enabled require(isFeatureEnabled(FEATURE_EIP3009_RECEPTIONS), "EIP3009 receptions are disabled"); // derive signer of the EIP712 ReceiveWithAuthorization message address signer = __deriveSigner(abi.encode(RECEIVE_WITH_AUTHORIZATION_TYPEHASH, _from, _to, _value, _validAfter, _validBefore, _nonce), v, r, s); // perform message integrity and security validations require(signer == _from, "invalid signature"); require(block.timestamp > _validAfter, "signature not yet valid"); require(block.timestamp < _validBefore, "signature expired"); require(_to == msg.sender, "access denied"); // use the nonce supplied (verify, mark as used, emit event) __useNonce(_from, _nonce, false); // delegate call to `__transferFrom` - execute the logic required __transferFrom(signer, _from, _to, _value); } /** * @inheritdoc EIP3009 * * @notice Attempt to cancel an authorization * * @param _authorizer transaction authorizer * @param _nonce unique random nonce to cancel (mark as used) * @param v the recovery byte of the signature * @param r half of the ECDSA signature pair * @param s half of the ECDSA signature pair */ function cancelAuthorization( address _authorizer, bytes32 _nonce, uint8 v, bytes32 r, bytes32 s ) public override { // derive signer of the EIP712 ReceiveWithAuthorization message address signer = __deriveSigner(abi.encode(CANCEL_AUTHORIZATION_TYPEHASH, _authorizer, _nonce), v, r, s); // perform message integrity and security validations require(signer == _authorizer, "invalid signature"); // cancel the nonce supplied (verify, mark as used, emit event) __useNonce(_authorizer, _nonce, true); } /** * @dev Auxiliary function to verify structured EIP712 message signature and derive its signer * * @param abiEncodedTypehash abi.encode of the message typehash together with all its parameters * @param v the recovery byte of the signature * @param r half of the ECDSA signature pair * @param s half of the ECDSA signature pair */ function __deriveSigner(bytes memory abiEncodedTypehash, uint8 v, bytes32 r, bytes32 s) private view returns(address) { // build the EIP-712 hashStruct of the message bytes32 hashStruct = keccak256(abiEncodedTypehash); // calculate the EIP-712 digest "\x19\x01" ‖ domainSeparator ‖ hashStruct(message) bytes32 digest = keccak256(abi.encodePacked("\x19\x01", DOMAIN_SEPARATOR, hashStruct)); // recover the address which signed the message with v, r, s address signer = ECDSA.recover(digest, v, r, s); // return the signer address derived from the signature return signer; } /** * @dev Auxiliary function to use/cancel the nonce supplied for a given authorizer: * 1. Verifies the nonce was not used before * 2. Marks the nonce as used * 3. Emits an event that the nonce was used/cancelled * * @dev Set `_cancellation` to false (default) to use nonce, * set `_cancellation` to true to cancel nonce * * @dev It is expected that the nonce supplied is a randomly * generated uint256 generated by the client * * @param _authorizer an address to use/cancel nonce for * @param _nonce random nonce to use * @param _cancellation true to emit `AuthorizationCancelled`, false to emit `AuthorizationUsed` event */ function __useNonce(address _authorizer, bytes32 _nonce, bool _cancellation) private { // verify nonce was not used before require(!usedNonces[_authorizer][_nonce], "invalid nonce"); // update the nonce state to "used" for that particular signer to avoid replay attack usedNonces[_authorizer][_nonce] = true; // depending on the usage type (use/cancel) if(_cancellation) { // emit an event regarding the nonce cancelled emit AuthorizationCanceled(_authorizer, _nonce); } else { // emit an event regarding the nonce used emit AuthorizationUsed(_authorizer, _nonce); } } // ===== End: EIP-3009 functions ===== // ===== Start: DAO Support (Compound-like voting delegation) ===== /** * @notice Gets current voting power of the account `_of` * * @param _of the address of account to get voting power of * @return current cumulative voting power of the account, * sum of token balances of all its voting delegators */ function votingPowerOf(address _of) public view returns (uint256) { // get a link to an array of voting power history records for an address specified KV[] storage history = votingPowerHistory[_of]; // lookup the history and return latest element return history.length == 0? 0: history[history.length - 1].v; } /** * @notice Gets past voting power of the account `_of` at some block `_blockNum` * * @dev Throws if `_blockNum` is not in the past (not the finalized block) * * @param _of the address of account to get voting power of * @param _blockNum block number to get the voting power at * @return past cumulative voting power of the account, * sum of token balances of all its voting delegators at block number `_blockNum` */ function votingPowerAt(address _of, uint256 _blockNum) public view returns (uint256) { // make sure block number is not in the past (not the finalized block) require(_blockNum < block.number, "block not yet mined"); // Compound msg not yet determined // `votingPowerHistory[_of]` is an array ordered by `blockNumber`, ascending; // apply binary search on `votingPowerHistory[_of]` to find such an entry number `i`, that // `votingPowerHistory[_of][i].k <= _blockNum`, but in the same time // `votingPowerHistory[_of][i + 1].k > _blockNum` // return the result - voting power found at index `i` return __binaryLookup(votingPowerHistory[_of], _blockNum); } /** * @dev Reads an entire voting power history array for the delegate specified * * @param _of delegate to query voting power history for * @return voting power history array for the delegate of interest */ function votingPowerHistoryOf(address _of) public view returns(KV[] memory) { // return an entire array as memory return votingPowerHistory[_of]; } /** * @dev Returns length of the voting power history array for the delegate specified; * useful since reading an entire array just to get its length is expensive (gas cost) * * @param _of delegate to query voting power history length for * @return voting power history array length for the delegate of interest */ function votingPowerHistoryLength(address _of) public view returns(uint256) { // read array length and return return votingPowerHistory[_of].length; } /** * @notice Gets past total token supply value at some block `_blockNum` * * @dev Throws if `_blockNum` is not in the past (not the finalized block) * * @param _blockNum block number to get the total token supply at * @return past total token supply at block number `_blockNum` */ function totalSupplyAt(uint256 _blockNum) public view returns(uint256) { // make sure block number is not in the past (not the finalized block) require(_blockNum < block.number, "block not yet mined"); // `totalSupplyHistory` is an array ordered by `k`, ascending; // apply binary search on `totalSupplyHistory` to find such an entry number `i`, that // `totalSupplyHistory[i].k <= _blockNum`, but in the same time // `totalSupplyHistory[i + 1].k > _blockNum` // return the result - value `totalSupplyHistory[i].v` found at index `i` return __binaryLookup(totalSupplyHistory, _blockNum); } /** * @dev Reads an entire total token supply history array * * @return total token supply history array, a key-value pair array, * where key is a block number and value is total token supply at that block */ function entireSupplyHistory() public view returns(KV[] memory) { // return an entire array as memory return totalSupplyHistory; } /** * @dev Returns length of the total token supply history array; * useful since reading an entire array just to get its length is expensive (gas cost) * * @return total token supply history array */ function totalSupplyHistoryLength() public view returns(uint256) { // read array length and return return totalSupplyHistory.length; } /** * @notice Delegates voting power of the delegator `msg.sender` to the delegate `_to` * * @dev Accepts zero value address to delegate voting power to, effectively * removing the delegate in that case * * @param _to address to delegate voting power to */ function delegate(address _to) public { // verify delegations are enabled require(isFeatureEnabled(FEATURE_DELEGATIONS), "delegations are disabled"); // delegate call to `__delegate` __delegate(msg.sender, _to); } /** * @dev Powers the meta transaction for `delegate` - `delegateWithAuthorization` * * @dev Auxiliary function to delegate delegator's `_from` voting power to the delegate `_to` * @dev Writes to `votingDelegates` and `votingPowerHistory` mappings * * @param _from delegator who delegates his voting power * @param _to delegate who receives the voting power */ function __delegate(address _from, address _to) private { // read current delegate to be replaced by a new one address _fromDelegate = votingDelegates[_from]; // read current voting power (it is equal to token balance) uint256 _value = tokenBalances[_from]; // reassign voting delegate to `_to` votingDelegates[_from] = _to; // update voting power for `_fromDelegate` and `_to` __moveVotingPower(_from, _fromDelegate, _to, _value); // emit an event emit DelegateChanged(_from, _fromDelegate, _to); } /** * @notice Delegates voting power of the delegator (represented by its signature) to the delegate `_to` * * @dev Accepts zero value address to delegate voting power to, effectively * removing the delegate in that case * * @dev Compliant with EIP-712: Ethereum typed structured data hashing and signing, * see https://eips.ethereum.org/EIPS/eip-712 * * @param _to address to delegate voting power to * @param _nonce nonce used to construct the signature, and used to validate it; * nonce is increased by one after successful signature validation and vote delegation * @param _exp signature expiration time * @param v the recovery byte of the signature * @param r half of the ECDSA signature pair * @param s half of the ECDSA signature pair */ function delegateWithAuthorization(address _to, bytes32 _nonce, uint256 _exp, uint8 v, bytes32 r, bytes32 s) public { // verify delegations on behalf are enabled require(isFeatureEnabled(FEATURE_DELEGATIONS_ON_BEHALF), "delegations on behalf are disabled"); // derive signer of the EIP712 Delegation message address signer = __deriveSigner(abi.encode(DELEGATION_TYPEHASH, _to, _nonce, _exp), v, r, s); // perform message integrity and security validations require(block.timestamp < _exp, "signature expired"); // Compound msg // use the nonce supplied (verify, mark as used, emit event) __useNonce(signer, _nonce, false); // delegate call to `__delegate` - execute the logic required __delegate(signer, _to); } /** * @dev Auxiliary function to move voting power `_value` * from delegate `_from` to the delegate `_to` * * @dev Doesn't have any effect if `_from == _to`, or if `_value == 0` * * @param _by an address which executed delegate, mint, burn, or transfer operation * which had led to delegate voting power change * @param _from delegate to move voting power from * @param _to delegate to move voting power to * @param _value voting power to move from `_from` to `_to` */ function __moveVotingPower(address _by, address _from, address _to, uint256 _value) private { // if there is no move (`_from == _to`) or there is nothing to move (`_value == 0`) if(_from == _to || _value == 0) { // return silently with no action return; } // if source address is not zero - decrease its voting power if(_from != address(0)) { // get a link to an array of voting power history records for an address specified KV[] storage _h = votingPowerHistory[_from]; // update source voting power: decrease by `_value` (uint256 _fromVal, uint256 _toVal) = __updateHistory(_h, sub, _value); // emit an event emit VotingPowerChanged(_by, _from, _fromVal, _toVal); } // if destination address is not zero - increase its voting power if(_to != address(0)) { // get a link to an array of voting power history records for an address specified KV[] storage _h = votingPowerHistory[_to]; // update destination voting power: increase by `_value` (uint256 _fromVal, uint256 _toVal) = __updateHistory(_h, add, _value); // emit an event emit VotingPowerChanged(_by, _to, _fromVal, _toVal); } } /** * @dev Auxiliary function to append key-value pair to an array, * sets the key to the current block number and * value as derived * * @param _h array of key-value pairs to append to * @param op a function (add/subtract) to apply * @param _delta the value for a key-value pair to add/subtract */ function __updateHistory( KV[] storage _h, function(uint256,uint256) pure returns(uint256) op, uint256 _delta ) private returns(uint256 _fromVal, uint256 _toVal) { // init the old value - value of the last pair of the array _fromVal = _h.length == 0? 0: _h[_h.length - 1].v; // init the new value - result of the operation on the old value _toVal = op(_fromVal, _delta); // if there is an existing voting power value stored for current block if(_h.length != 0 && _h[_h.length - 1].k == block.number) { // update voting power which is already stored in the current block _h[_h.length - 1].v = uint192(_toVal); } // otherwise - if there is no value stored for current block else { // add new element into array representing the value for current block _h.push(KV(uint64(block.number), uint192(_toVal))); } } /** * @dev Auxiliary function to lookup for a value in a sorted by key (ascending) * array of key-value pairs * * @dev This function finds a key-value pair element in an array with the closest key * to the key of interest (not exceeding that key) and returns the value * of the key-value pair element found * * @dev An array to search in is a KV[] key-value pair array ordered by key `k`, * it is sorted in ascending order (`k` increases as array index increases) * * @dev Returns zero for an empty array input regardless of the key input * * @param _h an array of key-value pair elements to search in * @param _k key of interest to look the value for * @return the value of the key-value pair of the key-value pair element with the closest * key to the key of interest (not exceeding that key) */ function __binaryLookup(KV[] storage _h, uint256 _k) private view returns(uint256) { // if an array is empty, there is nothing to lookup in if(_h.length == 0) { // by documented agreement, fall back to a zero result return 0; } // check last key-value pair key: // if the key is smaller than the key of interest if(_h[_h.length - 1].k <= _k) { // we're done - return the value from the last element return _h[_h.length - 1].v; } // check first voting power history record block number: // if history was never updated before the block of interest if(_h[0].k > _k) { // we're done - voting power at the block num of interest was zero return 0; } // left bound of the search interval, originally start of the array uint256 i = 0; // right bound of the search interval, originally end of the array uint256 j = _h.length - 1; // the iteration process narrows down the bounds by // splitting the interval in a half oce per each iteration while(j > i) { // get an index in the middle of the interval [i, j] uint256 k = j - (j - i) / 2; // read an element to compare it with the value of interest KV memory kv = _h[k]; // if we've got a strict equal - we're lucky and done if(kv.k == _k) { // just return the result - pair value at index `k` return kv.v; } // if the value of interest is larger - move left bound to the middle else if (kv.k < _k) { // move left bound `i` to the middle position `k` i = k; } // otherwise, when the value of interest is smaller - move right bound to the middle else { // move right bound `j` to the middle position `k - 1`: // element at position `k` is greater and cannot be the result j = k - 1; } } // reaching that point means no exact match found // since we're interested in the element which is not larger than the // element of interest, we return the lower bound `i` return _h[i].v; } /** * @dev Adds a + b * Function is used as a parameter for other functions * * @param a addition term 1 * @param b addition term 2 * @return a + b */ function add(uint256 a, uint256 b) private pure returns(uint256) { // add `a` to `b` and return return a + b; } /** * @dev Subtracts a - b * Function is used as a parameter for other functions * * @dev Requires a ≥ b * * @param a subtraction term 1 * @param b subtraction term 2, b ≤ a * @return a - b */ function sub(uint256 a, uint256 b) private pure returns(uint256) { // subtract `b` from `a` and return return a - b; } // ===== End: DAO Support (Compound-like voting delegation) ===== }
// SPDX-License-Identifier: MIT pragma solidity 0.8.7; import "./ERC20Spec.sol"; import "./ERC165Spec.sol"; /** * @title ERC1363 Interface * * @dev Interface defining a ERC1363 Payable Token contract. * Implementing contracts MUST implement the ERC1363 interface as well as the ERC20 and ERC165 interfaces. */ interface ERC1363 is ERC20, ERC165 { /* * Note: the ERC-165 identifier for this interface is 0xb0202a11. * 0xb0202a11 === * bytes4(keccak256('transferAndCall(address,uint256)')) ^ * bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^ * bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^ * bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^ * bytes4(keccak256('approveAndCall(address,uint256)')) ^ * bytes4(keccak256('approveAndCall(address,uint256,bytes)')) */ /** * @notice Transfer tokens from `msg.sender` to another address and then call `onTransferReceived` on receiver * @param to address The address which you want to transfer to * @param value uint256 The amount of tokens to be transferred * @return true unless throwing */ function transferAndCall(address to, uint256 value) external returns (bool); /** * @notice Transfer tokens from `msg.sender` to another address and then call `onTransferReceived` on receiver * @param to address The address which you want to transfer to * @param value uint256 The amount of tokens to be transferred * @param data bytes Additional data with no specified format, sent in call to `to` * @return true unless throwing */ function transferAndCall(address to, uint256 value, bytes memory data) external returns (bool); /** * @notice Transfer tokens from one address to another and then call `onTransferReceived` on receiver * @param from address The address which you want to send tokens from * @param to address The address which you want to transfer to * @param value uint256 The amount of tokens to be transferred * @return true unless throwing */ function transferFromAndCall(address from, address to, uint256 value) external returns (bool); /** * @notice Transfer tokens from one address to another and then call `onTransferReceived` on receiver * @param from address The address which you want to send tokens from * @param to address The address which you want to transfer to * @param value uint256 The amount of tokens to be transferred * @param data bytes Additional data with no specified format, sent in call to `to` * @return true unless throwing */ function transferFromAndCall(address from, address to, uint256 value, bytes memory data) external returns (bool); /** * @notice Approve the passed address to spend the specified amount of tokens on behalf of msg.sender * and then call `onApprovalReceived` on spender. * @param spender address The address which will spend the funds * @param value uint256 The amount of tokens to be spent */ function approveAndCall(address spender, uint256 value) external returns (bool); /** * @notice Approve the passed address to spend the specified amount of tokens on behalf of msg.sender * and then call `onApprovalReceived` on spender. * @param spender address The address which will spend the funds * @param value uint256 The amount of tokens to be spent * @param data bytes Additional data with no specified format, sent in call to `spender` */ function approveAndCall(address spender, uint256 value, bytes memory data) external returns (bool); } /** * @title ERC1363Receiver Interface * * @dev Interface for any contract that wants to support `transferAndCall` or `transferFromAndCall` * from ERC1363 token contracts. */ interface ERC1363Receiver { /* * Note: the ERC-165 identifier for this interface is 0x88a7ca5c. * 0x88a7ca5c === bytes4(keccak256("onTransferReceived(address,address,uint256,bytes)")) */ /** * @notice Handle the receipt of ERC1363 tokens * * @dev Any ERC1363 smart contract calls this function on the recipient * after a `transfer` or a `transferFrom`. This function MAY throw to revert and reject the * transfer. Return of other than the magic value MUST result in the * transaction being reverted. * Note: the token contract address is always the message sender. * * @param operator address The address which called `transferAndCall` or `transferFromAndCall` function * @param from address The address which are token transferred from * @param value uint256 The amount of tokens transferred * @param data bytes Additional data with no specified format * @return `bytes4(keccak256("onTransferReceived(address,address,uint256,bytes)"))` * unless throwing */ function onTransferReceived(address operator, address from, uint256 value, bytes memory data) external returns (bytes4); } /** * @title ERC1363Spender Interface * * @dev Interface for any contract that wants to support `approveAndCall` * from ERC1363 token contracts. */ interface ERC1363Spender { /* * Note: the ERC-165 identifier for this interface is 0x7b04a2d0. * 0x7b04a2d0 === bytes4(keccak256("onApprovalReceived(address,uint256,bytes)")) */ /** * @notice Handle the approval of ERC1363 tokens * * @dev Any ERC1363 smart contract calls this function on the recipient * after an `approve`. This function MAY throw to revert and reject the * approval. Return of other than the magic value MUST result in the * transaction being reverted. * Note: the token contract address is always the message sender. * * @param owner address The address which called `approveAndCall` function * @param value uint256 The amount of tokens to be spent * @param data bytes Additional data with no specified format * @return `bytes4(keccak256("onApprovalReceived(address,uint256,bytes)"))` * unless throwing */ function onApprovalReceived(address owner, uint256 value, bytes memory data) external returns (bytes4); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.7; /** * @title EIP-2612: permit - 712-signed approvals * * @notice A function permit extending ERC-20 which allows for approvals to be made via secp256k1 signatures. * This kind of “account abstraction for ERC-20” brings about two main benefits: * - transactions involving ERC-20 operations can be paid using the token itself rather than ETH, * - approve and pull operations can happen in a single transaction instead of two consecutive transactions, * - while adding as little as possible over the existing ERC-20 standard. * * @notice See https://eips.ethereum.org/EIPS/eip-2612#specification */ interface EIP2612 { /** * @notice EIP712 domain separator of the smart contract. It should be unique to the contract * and chain to prevent replay attacks from other domains, and satisfy the requirements of EIP-712, * but is otherwise unconstrained. */ function DOMAIN_SEPARATOR() external view returns (bytes32); /** * @notice Counter of the nonces used for the given address; nonce are used sequentially * * @dev To prevent from replay attacks nonce is incremented for each address after a successful `permit` execution * * @param owner an address to query number of used nonces for * @return number of used nonce, nonce number to be used next */ function nonces(address owner) external view returns (uint); /** * @notice For all addresses owner, spender, uint256s value, deadline and nonce, uint8 v, bytes32 r and s, * a call to permit(owner, spender, value, deadline, v, r, s) will set approval[owner][spender] to value, * increment nonces[owner] by 1, and emit a corresponding Approval event, * if and only if the following conditions are met: * - The current blocktime is less than or equal to deadline. * - owner is not the zero address. * - nonces[owner] (before the state update) is equal to nonce. * - r, s and v is a valid secp256k1 signature from owner of the message: * * @param owner token owner address, granting an approval to spend its tokens * @param spender an address approved by the owner (token owner) * to spend some tokens on its behalf * @param value an amount of tokens spender `spender` is allowed to * transfer on behalf of the token owner * @param v the recovery byte of the signature * @param r half of the ECDSA signature pair * @param s half of the ECDSA signature pair */ function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external; }
// SPDX-License-Identifier: MIT pragma solidity 0.8.7; /** * @title EIP-3009: Transfer With Authorization * * @notice A contract interface that enables transferring of fungible assets via a signed authorization. * See https://eips.ethereum.org/EIPS/eip-3009 * See https://eips.ethereum.org/EIPS/eip-3009#specification */ interface EIP3009 { /** * @dev Fired whenever the nonce gets used (ex.: `transferWithAuthorization`, `receiveWithAuthorization`) * * @param authorizer an address which has used the nonce * @param nonce the nonce used */ event AuthorizationUsed(address indexed authorizer, bytes32 indexed nonce); /** * @dev Fired whenever the nonce gets cancelled (ex.: `cancelAuthorization`) * * @dev Both `AuthorizationUsed` and `AuthorizationCanceled` imply the nonce * cannot be longer used, the only difference is that `AuthorizationCanceled` * implies no smart contract state change made (except the nonce marked as cancelled) * * @param authorizer an address which has cancelled the nonce * @param nonce the nonce cancelled */ event AuthorizationCanceled(address indexed authorizer, bytes32 indexed nonce); /** * @notice Returns the state of an authorization, more specifically * if the specified nonce was already used by the address specified * * @dev Nonces are expected to be client-side 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); /** * @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; /** * @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. * @dev See https://eips.ethereum.org/EIPS/eip-3009#security-considerations * * @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; /** * @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 ) external; }
// SPDX-License-Identifier: MIT pragma solidity 0.8.7; /** * @title Access Control List * * @notice Access control smart contract provides an API to check * if specific operation is permitted globally and/or * if particular user has a permission to execute it. * * @notice It deals with two main entities: features and roles. * * @notice Features are designed to be used to enable/disable specific * functions (public functions) of the smart contract for everyone. * @notice User roles are designed to restrict access to specific * functions (restricted functions) of the smart contract to some users. * * @notice Terms "role", "permissions" and "set of permissions" have equal meaning * in the documentation text and may be used interchangeably. * @notice Terms "permission", "single permission" implies only one permission bit set. * * @notice Access manager is a special role which allows to grant/revoke other roles. * Access managers can only grant/revoke permissions which they have themselves. * As an example, access manager with no other roles set can only grant/revoke its own * access manager permission and nothing else. * * @notice Access manager permission should be treated carefully, as a super admin permission: * Access manager with even no other permission can interfere with another account by * granting own access manager permission to it and effectively creating more powerful * permission set than its own. * * @dev Both current and OpenZeppelin AccessControl implementations feature a similar API * to check/know "who is allowed to do this thing". * @dev Zeppelin implementation is more flexible: * - it allows setting unlimited number of roles, while current is limited to 256 different roles * - it allows setting an admin for each role, while current allows having only one global admin * @dev Current implementation is more lightweight: * - it uses only 1 bit per role, while Zeppelin uses 256 bits * - it allows setting up to 256 roles at once, in a single transaction, while Zeppelin allows * setting only one role in a single transaction * * @dev This smart contract is designed to be inherited by other * smart contracts which require access control management capabilities. * * @dev Access manager permission has a bit 255 set. * This bit must not be used by inheriting contracts for any other permissions/features. */ contract AccessControl { /** * @notice Access manager is responsible for assigning the roles to users, * enabling/disabling global features of the smart contract * @notice Access manager can add, remove and update user roles, * remove and update global features * * @dev Role ROLE_ACCESS_MANAGER allows modifying user roles and global features * @dev Role ROLE_ACCESS_MANAGER has single bit at position 255 enabled */ uint256 public constant ROLE_ACCESS_MANAGER = 0x8000000000000000000000000000000000000000000000000000000000000000; /** * @dev Bitmask representing all the possible permissions (super admin role) * @dev Has all the bits are enabled (2^256 - 1 value) */ uint256 private constant FULL_PRIVILEGES_MASK = type(uint256).max; // before 0.8.0: uint256(-1) overflows to 0xFFFF... /** * @notice Privileged addresses with defined roles/permissions * @notice In the context of ERC20/ERC721 tokens these can be permissions to * allow minting or burning tokens, transferring on behalf and so on * * @dev Maps user address to the permissions bitmask (role), where each bit * represents a permission * @dev Bitmask 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF * represents all possible permissions * @dev 'This' address mapping represents global features of the smart contract */ mapping(address => uint256) public userRoles; /** * @dev Fired in updateRole() and updateFeatures() * * @param _by operator which called the function * @param _to address which was granted/revoked permissions * @param _requested permissions requested * @param _actual permissions effectively set */ event RoleUpdated(address indexed _by, address indexed _to, uint256 _requested, uint256 _actual); /** * @notice Creates an access control instance, * setting contract creator to have full privileges */ constructor() { // contract creator has full privileges userRoles[msg.sender] = FULL_PRIVILEGES_MASK; } /** * @notice Retrieves globally set of features enabled * * @dev Effectively reads userRoles role for the contract itself * * @return 256-bit bitmask of the features enabled */ function features() public view returns(uint256) { // features are stored in 'this' address mapping of `userRoles` structure return userRoles[address(this)]; } /** * @notice Updates set of the globally enabled features (`features`), * taking into account sender's permissions * * @dev Requires transaction sender to have `ROLE_ACCESS_MANAGER` permission * @dev Function is left for backward compatibility with older versions * * @param _mask bitmask representing a set of features to enable/disable */ function updateFeatures(uint256 _mask) public { // delegate call to `updateRole` updateRole(address(this), _mask); } /** * @notice Updates set of permissions (role) for a given user, * taking into account sender's permissions. * * @dev Setting role to zero is equivalent to removing an all permissions * @dev Setting role to `FULL_PRIVILEGES_MASK` is equivalent to * copying senders' permissions (role) to the user * @dev Requires transaction sender to have `ROLE_ACCESS_MANAGER` permission * * @param operator address of a user to alter permissions for or zero * to alter global features of the smart contract * @param role bitmask representing a set of permissions to * enable/disable for a user specified */ function updateRole(address operator, uint256 role) public { // caller must have a permission to update user roles require(isSenderInRole(ROLE_ACCESS_MANAGER), "access denied"); // evaluate the role and reassign it userRoles[operator] = evaluateBy(msg.sender, userRoles[operator], role); // fire an event emit RoleUpdated(msg.sender, operator, role, userRoles[operator]); } /** * @notice Determines the permission bitmask an operator can set on the * target permission set * @notice Used to calculate the permission bitmask to be set when requested * in `updateRole` and `updateFeatures` functions * * @dev Calculated based on: * 1) operator's own permission set read from userRoles[operator] * 2) target permission set - what is already set on the target * 3) desired permission set - what do we want set target to * * @dev Corner cases: * 1) Operator is super admin and its permission set is `FULL_PRIVILEGES_MASK`: * `desired` bitset is returned regardless of the `target` permission set value * (what operator sets is what they get) * 2) Operator with no permissions (zero bitset): * `target` bitset is returned regardless of the `desired` value * (operator has no authority and cannot modify anything) * * @dev Example: * Consider an operator with the permissions bitmask 00001111 * is about to modify the target permission set 01010101 * Operator wants to set that permission set to 00110011 * Based on their role, an operator has the permissions * to update only lowest 4 bits on the target, meaning that * high 4 bits of the target set in this example is left * unchanged and low 4 bits get changed as desired: 01010011 * * @param operator address of the contract operator which is about to set the permissions * @param target input set of permissions to operator is going to modify * @param desired desired set of permissions operator would like to set * @return resulting set of permissions given operator will set */ function evaluateBy(address operator, uint256 target, uint256 desired) public view returns(uint256) { // read operator's permissions uint256 p = userRoles[operator]; // taking into account operator's permissions, // 1) enable the permissions desired on the `target` target |= p & desired; // 2) disable the permissions desired on the `target` target &= FULL_PRIVILEGES_MASK ^ (p & (FULL_PRIVILEGES_MASK ^ desired)); // return calculated result return target; } /** * @notice Checks if requested set of features is enabled globally on the contract * * @param required set of features to check against * @return true if all the features requested are enabled, false otherwise */ function isFeatureEnabled(uint256 required) public view returns(bool) { // delegate call to `__hasRole`, passing `features` property return __hasRole(features(), required); } /** * @notice Checks if transaction sender `msg.sender` has all the permissions required * * @param required set of permissions (role) to check against * @return true if all the permissions requested are enabled, false otherwise */ function isSenderInRole(uint256 required) public view returns(bool) { // delegate call to `isOperatorInRole`, passing transaction sender return isOperatorInRole(msg.sender, required); } /** * @notice Checks if operator has all the permissions (role) required * * @param operator address of the user to check role for * @param required set of permissions (role) to check * @return true if all the permissions requested are enabled, false otherwise */ function isOperatorInRole(address operator, uint256 required) public view returns(bool) { // delegate call to `__hasRole`, passing operator's permissions (role) return __hasRole(userRoles[operator], required); } /** * @dev Checks if role `actual` contains all the permissions required `required` * * @param actual existent role * @param required required role * @return true if actual has required role (all permissions), false otherwise */ function __hasRole(uint256 actual, uint256 required) internal pure returns(bool) { // check the bitmask for the role required and return the result return actual & required == required; } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.7; /** * @title Address Utils * * @dev Utility library of inline functions on addresses * * @dev Copy of the Zeppelin's library: * https://github.com/gnosis/openzeppelin-solidity/blob/master/contracts/AddressUtils.sol */ library AddressUtils { /** * @notice Checks if the target address is a contract * * @dev It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * @dev 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 * * @param addr address to check * @return whether the target address is a contract */ function isContract(address addr) internal view returns (bool) { // a variable to load `extcodesize` to uint256 size = 0; // XXX Currently there is no better way to check if there is a contract in an address // than to check the size of the code at that address. // See https://ethereum.stackexchange.com/a/14016/36603 for more details about how this works. // TODO: Check this again before the Serenity release, because all addresses will be contracts. // solium-disable-next-line security/no-inline-assembly assembly { // retrieve the size of the code at address `addr` size := extcodesize(addr) } // positive size indicates a smart contract address return size > 0; } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.7; /** * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations. * * These functions can be used to verify that a message was signed by the holder * of the private keys of a given address. * * @dev Copy of the Zeppelin's library: * https://github.com/OpenZeppelin/openzeppelin-contracts/blob/b0cf6fbb7a70f31527f36579ad644e1cf12fdf4e/contracts/utils/cryptography/ECDSA.sol */ library ECDSA { /** * @dev Returns the address that signed a hashed message (`hash`) with * `signature`. This address can then be used for verification purposes. * * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures: * this function rejects them by requiring the `s` value to be in the lower * half order, and the `v` value to be either 27 or 28. * * IMPORTANT: `hash` _must_ be the result of a hash operation for the * verification to be secure: it is possible to craft signatures that * recover to arbitrary addresses for non-hashed data. A safe way to ensure * this is by receiving a hash of the original message (which may otherwise * be too long), and then calling {toEthSignedMessageHash} on it. * * Documentation for signature generation: * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js] * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers] */ function recover(bytes32 hash, bytes memory signature) internal pure returns (address) { // Divide the signature in r, s and v variables bytes32 r; bytes32 s; uint8 v; // Check the signature length // - case 65: r,s,v signature (standard) // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._ if (signature.length == 65) { // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { r := mload(add(signature, 0x20)) s := mload(add(signature, 0x40)) v := byte(0, mload(add(signature, 0x60))) } } else if (signature.length == 64) { // ecrecover takes the signature parameters, and the only way to get them // currently is to use assembly. assembly { let vs := mload(add(signature, 0x40)) r := mload(add(signature, 0x20)) s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff) v := add(shr(255, vs), 27) } } else { revert("invalid signature length"); } return recover(hash, v, r, s); } /** * @dev Overload of {ECDSA-recover} that receives the `v`, * `r` and `s` signature fields separately. */ function recover( bytes32 hash, uint8 v, bytes32 r, bytes32 s ) internal pure returns (address) { // 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. require( uint256(s) <= 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0, "invalid signature 's' value" ); require(v == 27 || v == 28, "invalid signature 'v' value"); // If the signature is valid (and not malleable), return the signer address address signer = ecrecover(hash, v, r, s); require(signer != address(0), "invalid signature"); return signer; } /** * @dev Returns an Ethereum Signed Message, created from a `hash`. This * produces hash corresponding to the one signed with the * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`] * JSON-RPC method as part of EIP-191. * * See {recover}. */ function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) { // 32 is the length in bytes of hash, // enforced by the type signature above return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash)); } /** * @dev Returns an Ethereum Signed Typed Data, created from a * `domainSeparator` and a `structHash`. This produces hash corresponding * to the one signed with the * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`] * JSON-RPC method as part of EIP-712. * * See {recover}. */ function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) { return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash)); } }
// SPDX-License-Identifier: MIT pragma solidity 0.8.7; /** * @title EIP-20: ERC-20 Token Standard * * @notice The ERC-20 (Ethereum Request for Comments 20), proposed by Fabian Vogelsteller in November 2015, * is a Token Standard that implements an API for tokens within Smart Contracts. * * @notice It provides functionalities like to transfer tokens from one account to another, * to get the current token balance of an account and also the total supply of the token available on the network. * Besides these it also has some other functionalities like to approve that an amount of * token from an account can be spent by a third party account. * * @notice If a Smart Contract implements the following methods and events it can be called an ERC-20 Token * Contract and, once deployed, it will be responsible to keep track of the created tokens on Ethereum. * * @notice See https://ethereum.org/en/developers/docs/standards/tokens/erc-20/ * @notice See https://eips.ethereum.org/EIPS/eip-20 */ interface ERC20 { /** * @dev Fired in transfer(), transferFrom() to indicate that token transfer happened * * @param from an address tokens were consumed from * @param to an address tokens were sent to * @param value number of tokens transferred */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Fired in approve() to indicate an approval event happened * * @param owner an address which granted a permission to transfer * tokens on its behalf * @param spender an address which received a permission to transfer * tokens on behalf of the owner `_owner` * @param value amount of tokens granted to transfer on behalf */ event Approval(address indexed owner, address indexed spender, uint256 value); /** * @return name of the token (ex.: USD Coin) */ // OPTIONAL - This method can be used to improve usability, // but interfaces and other contracts MUST NOT expect these values to be present. // function name() external view returns (string memory); /** * @return symbol of the token (ex.: USDC) */ // OPTIONAL - This method can be used to improve usability, // but interfaces and other contracts MUST NOT expect these values to be present. // function symbol() external view returns (string memory); /** * @dev Returns the number of decimals used to get its user representation. * For example, if `decimals` equals `2`, a balance of `505` tokens should * be displayed to a user as `5,05` (`505 / 10 ** 2`). * * @dev Tokens usually opt for a value of 18, imitating the relationship between * Ether and Wei. This is the value {ERC20} uses, unless this function is * overridden; * * @dev NOTE: This information is only used for _display_ purposes: it in * no way affects any of the arithmetic of the contract, including * {IERC20-balanceOf} and {IERC20-transfer}. * * @return token decimals */ // OPTIONAL - This method can be used to improve usability, // but interfaces and other contracts MUST NOT expect these values to be present. // function decimals() external view returns (uint8); /** * @return the amount of tokens in existence */ function totalSupply() external view returns (uint256); /** * @notice Gets the balance of a particular address * * @param _owner the address to query the the balance for * @return balance an amount of tokens owned by the address specified */ function balanceOf(address _owner) external view returns (uint256 balance); /** * @notice Transfers some tokens to an external address or a smart contract * * @dev Called by token owner (an address which has a * positive token balance tracked by this smart contract) * @dev Throws on any error like * * insufficient token balance or * * incorrect `_to` address: * * zero address or * * self address or * * smart contract which doesn't support ERC20 * * @param _to an address to transfer tokens to, * must be either an external address or a smart contract, * compliant with the ERC20 standard * @param _value amount of tokens to be transferred,, zero * value is allowed * @return success true on success, throws otherwise */ function transfer(address _to, uint256 _value) external returns (bool success); /** * @notice Transfers some tokens on behalf of address `_from' (token owner) * to some other address `_to` * * @dev Called by token owner on his own or approved address, * an address approved earlier by token owner to * transfer some amount of tokens on its behalf * @dev Throws on any error like * * insufficient token balance or * * incorrect `_to` address: * * zero address or * * same as `_from` address (self transfer) * * smart contract which doesn't support ERC20 * * @param _from token owner which approved caller (transaction sender) * to transfer `_value` of tokens on its behalf * @param _to an address to transfer tokens to, * must be either an external address or a smart contract, * compliant with the ERC20 standard * @param _value amount of tokens to be transferred,, zero * value is allowed * @return success true on success, throws otherwise */ function transferFrom(address _from, address _to, uint256 _value) external returns (bool success); /** * @notice Approves address called `_spender` to transfer some amount * of tokens on behalf of the owner (transaction sender) * * @dev Transaction sender must not necessarily own any tokens to grant the permission * * @param _spender an address approved by the caller (token owner) * to spend some tokens on its behalf * @param _value an amount of tokens spender `_spender` is allowed to * transfer on behalf of the token owner * @return success true on success, throws otherwise */ function approve(address _spender, uint256 _value) external returns (bool success); /** * @notice Returns the amount which _spender is still allowed to withdraw from _owner. * * @dev A function to check an amount of tokens owner approved * to transfer on its behalf by some other address called "spender" * * @param _owner an address which approves transferring some tokens on its behalf * @param _spender an address approved to transfer some tokens on behalf * @return remaining an amount of tokens approved address `_spender` can transfer on behalf * of token owner `_owner` */ function allowance(address _owner, address _spender) external view returns (uint256 remaining); }
// SPDX-License-Identifier: MIT pragma solidity 0.8.7; /** * @title ERC-165 Standard Interface Detection * * @dev Interface of the ERC165 standard, as defined in the * https://eips.ethereum.org/EIPS/eip-165[EIP]. * * @dev Implementers can declare support of contract interfaces, * which can then be queried by others. * * @author Christian Reitwießner, Nick Johnson, Fabian Vogelsteller, Jordi Baylina, Konrad Feldmeier, William Entriken */ interface ERC165 { /** * @notice Query if a contract implements an interface * * @dev Interface identification is specified in ERC-165. * This function uses less than 30,000 gas. * * @param interfaceID The interface identifier, as specified in ERC-165 * @return `true` if the contract implements `interfaceID` and * `interfaceID` is not 0xffffffff, `false` otherwise */ function supportsInterface(bytes4 interfaceID) external view returns (bool); }
{ "optimizer": { "enabled": true, "runs": 200 }, "outputSelection": { "*": { "*": [ "evm.bytecode", "evm.deployedBytecode", "devdoc", "userdoc", "metadata", "abi" ] } }, "libraries": {} }
Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
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Contract Creation Code
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
0000000000000000000000000738f702d1a7364d356729cb8845701885c487a1
-----Decoded View---------------
Arg [0] : _initialHolder (address): 0x0738F702D1a7364d356729Cb8845701885C487A1
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000000738f702d1a7364d356729cb8845701885c487a1
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