ETH Price: $1,593.16 (+0.06%)
Gas: 7 Gwei
 
Transaction Hash
Method
Block
From
To
Value
Set Manager178863402023-08-10 18:41:3544 days 16 hrs ago1691692895IN
0x1820a4...905faD24
0 ETH0.0007262827.24043486
Set Manager153229592022-08-11 21:06:15408 days 13 hrs ago1660251975IN
0x1820a4...905faD24
0 ETH0.0008102817.39847256
Set Interface Im...153126322022-08-10 5:56:27410 days 4 hrs ago1660110987IN
0x1820a4...905faD24
0 ETH0.0004656613.88190368
Set Interface Im...153126322022-08-10 5:56:27410 days 4 hrs ago1660110987IN
0x1820a4...905faD24
0 ETH0.0005590816.66678522
Set Interface Im...153126322022-08-10 5:56:27410 days 4 hrs ago1660110987IN
0x1820a4...905faD24
0 ETH0.000455278.51863063
Set Interface Im...153124962022-08-10 5:21:40410 days 5 hrs ago1660108900IN
0x1820a4...905faD24
0 ETH0.0006561511.77679696
Set Interface Im...153124802022-08-10 5:18:29410 days 5 hrs ago1660108709IN
0x1820a4...905faD24
0 ETH0.0007167912.89574519
Set Interface Im...153124092022-08-10 5:01:50410 days 5 hrs ago1660107710IN
0x1820a4...905faD24
0 ETH0.0007456813.37327662
Set Manager153124092022-08-10 5:01:50410 days 5 hrs ago1660107710IN
0x1820a4...905faD24
0 ETH0.0003285612.32344739
Update ERC165Cac...153123782022-08-10 4:54:43410 days 5 hrs ago1660107283IN
0x1820a4...905faD24
0 ETH0.0009952533.15297262
Set Manager114752762020-12-18 5:36:541010 days 5 hrs ago1608269814IN
0x1820a4...905faD24
0 ETH0.0016110760.2
Set Interface Im...114578442020-12-15 13:14:321012 days 21 hrs ago1608038072IN
0x1820a4...905faD24
0 ETH0.0038795677.00000145
Set Interface Im...112550972020-11-14 9:41:341044 days 1 hr ago1605346894IN
0x1820a4...905faD24
0 ETH0.0009113318.0877785
Set Interface Im...112549322020-11-14 9:05:291044 days 1 hr ago1605344729IN
0x1820a4...905faD24
0 ETH0.0006035117
Set Interface Im...112155722020-11-08 8:00:431050 days 2 hrs ago1604822443IN
0x1820a4...905faD24
0 ETH0.0027777255
Set Interface Im...112117292020-11-07 17:44:111050 days 17 hrs ago1604771051IN
0x1820a4...905faD24
0 ETH0.0015111630
Set Interface Im...112116902020-11-07 17:33:561050 days 17 hrs ago1604770436IN
0x1820a4...905faD24
0 ETH0.0025250550
Set Interface Im...112116872020-11-07 17:32:321050 days 17 hrs ago1604770352IN
0x1820a4...905faD24
0 ETH0.002518650
Set Interface Im...112116832020-11-07 17:31:401050 days 17 hrs ago1604770300IN
0x1820a4...905faD24
0 ETH0.002519150
Set Interface Im...112114282020-11-07 16:40:291050 days 18 hrs ago1604767229IN
0x1820a4...905faD24
0 ETH0.0023702246.97522596
Set Interface Im...111500962020-10-29 6:42:101060 days 4 hrs ago1603953730IN
0x1820a4...905faD24
0 ETH0.0006816724.7
Set Interface Im...111500882020-10-29 6:41:081060 days 4 hrs ago1603953668IN
0x1820a4...905faD24
0 ETH0.0006843524.808
Set Interface Im...106980512020-08-20 16:07:341129 days 18 hrs ago1597939654IN
0x1820a4...905faD24
0 ETH0.00658948133
Set Interface Im...106962172020-08-20 9:23:591130 days 1 hr ago1597915439IN
0x1820a4...905faD24
0 ETH0.00510313103
Set Interface Im...106909802020-08-19 14:03:561130 days 20 hrs ago1597845836IN
0x1820a4...905faD24
0 ETH0.00931446188
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Contract Source Code Verified (Exact Match)

Contract Name:
ERC1820Registry

Compiler Version
v0.5.3+commit.10d17f24

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion
/**
 *Submitted for verification at Etherscan.io on 2019-04-03
*/

/* ERC1820 Pseudo-introspection Registry Contract
 * This standard defines a universal registry smart contract where any address (contract or regular account) can
 * register which interface it supports and which smart contract is responsible for its implementation.
 *
 * Written in 2019 by Jordi Baylina and Jacques Dafflon
 *
 * To the extent possible under law, the author(s) have dedicated all copyright and related and neighboring rights to
 * this software to the public domain worldwide. This software is distributed without any warranty.
 *
 * You should have received a copy of the CC0 Public Domain Dedication along with this software. If not, see
 * <http://creativecommons.org/publicdomain/zero/1.0/>.
 *
 *    β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•—β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•—  β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•— β–ˆβ–ˆβ•— β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•— β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•—  β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•—
 *    β–ˆβ–ˆβ•”β•β•β•β•β•β–ˆβ–ˆβ•”β•β•β–ˆβ–ˆβ•—β–ˆβ–ˆβ•”β•β•β•β•β•β–ˆβ–ˆβ–ˆβ•‘β–ˆβ–ˆβ•”β•β•β–ˆβ–ˆβ•—β•šβ•β•β•β•β–ˆβ–ˆβ•—β–ˆβ–ˆβ•”β•β–ˆβ–ˆβ–ˆβ–ˆβ•—
 *    β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•—  β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•”β•β–ˆβ–ˆβ•‘     β•šβ–ˆβ–ˆβ•‘β•šβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•”β• β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•”β•β–ˆβ–ˆβ•‘β–ˆβ–ˆβ•”β–ˆβ–ˆβ•‘
 *    β–ˆβ–ˆβ•”β•β•β•  β–ˆβ–ˆβ•”β•β•β–ˆβ–ˆβ•—β–ˆβ–ˆβ•‘      β–ˆβ–ˆβ•‘β–ˆβ–ˆβ•”β•β•β–ˆβ–ˆβ•—β–ˆβ–ˆβ•”β•β•β•β• β–ˆβ–ˆβ–ˆβ–ˆβ•”β•β–ˆβ–ˆβ•‘
 *    β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•—β–ˆβ–ˆβ•‘  β–ˆβ–ˆβ•‘β•šβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•— β–ˆβ–ˆβ•‘β•šβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•”β•β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•—β•šβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•”β•
 *    β•šβ•β•β•β•β•β•β•β•šβ•β•  β•šβ•β• β•šβ•β•β•β•β•β• β•šβ•β• β•šβ•β•β•β•β• β•šβ•β•β•β•β•β•β• β•šβ•β•β•β•β•β•
 *
 *    β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•— β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•— β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•— β–ˆβ–ˆβ•—β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•—β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•—β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•— β–ˆβ–ˆβ•—   β–ˆβ–ˆβ•—
 *    β–ˆβ–ˆβ•”β•β•β–ˆβ–ˆβ•—β–ˆβ–ˆβ•”β•β•β•β•β•β–ˆβ–ˆβ•”β•β•β•β•β• β–ˆβ–ˆβ•‘β–ˆβ–ˆβ•”β•β•β•β•β•β•šβ•β•β–ˆβ–ˆβ•”β•β•β•β–ˆβ–ˆβ•”β•β•β–ˆβ–ˆβ•—β•šβ–ˆβ–ˆβ•— β–ˆβ–ˆβ•”β•
 *    β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•”β•β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•—  β–ˆβ–ˆβ•‘  β–ˆβ–ˆβ–ˆβ•—β–ˆβ–ˆβ•‘β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•—   β–ˆβ–ˆβ•‘   β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•”β• β•šβ–ˆβ–ˆβ–ˆβ–ˆβ•”β•
 *    β–ˆβ–ˆβ•”β•β•β–ˆβ–ˆβ•—β–ˆβ–ˆβ•”β•β•β•  β–ˆβ–ˆβ•‘   β–ˆβ–ˆβ•‘β–ˆβ–ˆβ•‘β•šβ•β•β•β•β–ˆβ–ˆβ•‘   β–ˆβ–ˆβ•‘   β–ˆβ–ˆβ•”β•β•β–ˆβ–ˆβ•—  β•šβ–ˆβ–ˆβ•”β•
 *    β–ˆβ–ˆβ•‘  β–ˆβ–ˆβ•‘β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•—β•šβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•”β•β–ˆβ–ˆβ•‘β–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ–ˆβ•‘   β–ˆβ–ˆβ•‘   β–ˆβ–ˆβ•‘  β–ˆβ–ˆβ•‘   β–ˆβ–ˆβ•‘
 *    β•šβ•β•  β•šβ•β•β•šβ•β•β•β•β•β•β• β•šβ•β•β•β•β•β• β•šβ•β•β•šβ•β•β•β•β•β•β•   β•šβ•β•   β•šβ•β•  β•šβ•β•   β•šβ•β•
 *
 */
pragma solidity 0.5.3;
// IV is value needed to have a vanity address starting with '0x1820'.
// IV: 53759

/// @dev The interface a contract MUST implement if it is the implementer of
/// some (other) interface for any address other than itself.
interface ERC1820ImplementerInterface {
    /// @notice Indicates whether the contract implements the interface 'interfaceHash' for the address 'addr' or not.
    /// @param interfaceHash keccak256 hash of the name of the interface
    /// @param addr Address for which the contract will implement the interface
    /// @return ERC1820_ACCEPT_MAGIC only if the contract implements 'interfaceHash' for the address 'addr'.
    function canImplementInterfaceForAddress(bytes32 interfaceHash, address addr) external view returns(bytes32);
}


/// @title ERC1820 Pseudo-introspection Registry Contract
/// @author Jordi Baylina and Jacques Dafflon
/// @notice This contract is the official implementation of the ERC1820 Registry.
/// @notice For more details, see https://eips.ethereum.org/EIPS/eip-1820
contract ERC1820Registry {
    /// @notice ERC165 Invalid ID.
    bytes4 constant internal INVALID_ID = 0xffffffff;
    /// @notice Method ID for the ERC165 supportsInterface method (= `bytes4(keccak256('supportsInterface(bytes4)'))`).
    bytes4 constant internal ERC165ID = 0x01ffc9a7;
    /// @notice Magic value which is returned if a contract implements an interface on behalf of some other address.
    bytes32 constant internal ERC1820_ACCEPT_MAGIC = keccak256(abi.encodePacked("ERC1820_ACCEPT_MAGIC"));

    /// @notice mapping from addresses and interface hashes to their implementers.
    mapping(address => mapping(bytes32 => address)) internal interfaces;
    /// @notice mapping from addresses to their manager.
    mapping(address => address) internal managers;
    /// @notice flag for each address and erc165 interface to indicate if it is cached.
    mapping(address => mapping(bytes4 => bool)) internal erc165Cached;

    /// @notice Indicates a contract is the 'implementer' of 'interfaceHash' for 'addr'.
    event InterfaceImplementerSet(address indexed addr, bytes32 indexed interfaceHash, address indexed implementer);
    /// @notice Indicates 'newManager' is the address of the new manager for 'addr'.
    event ManagerChanged(address indexed addr, address indexed newManager);

    /// @notice Query if an address implements an interface and through which contract.
    /// @param _addr Address being queried for the implementer of an interface.
    /// (If '_addr' is the zero address then 'msg.sender' is assumed.)
    /// @param _interfaceHash Keccak256 hash of the name of the interface as a string.
    /// E.g., 'web3.utils.keccak256("ERC777TokensRecipient")' for the 'ERC777TokensRecipient' interface.
    /// @return The address of the contract which implements the interface '_interfaceHash' for '_addr'
    /// or '0' if '_addr' did not register an implementer for this interface.
    function getInterfaceImplementer(address _addr, bytes32 _interfaceHash) external view returns (address) {
        address addr = _addr == address(0) ? msg.sender : _addr;
        if (isERC165Interface(_interfaceHash)) {
            bytes4 erc165InterfaceHash = bytes4(_interfaceHash);
            return implementsERC165Interface(addr, erc165InterfaceHash) ? addr : address(0);
        }
        return interfaces[addr][_interfaceHash];
    }

    /// @notice Sets the contract which implements a specific interface for an address.
    /// Only the manager defined for that address can set it.
    /// (Each address is the manager for itself until it sets a new manager.)
    /// @param _addr Address for which to set the interface.
    /// (If '_addr' is the zero address then 'msg.sender' is assumed.)
    /// @param _interfaceHash Keccak256 hash of the name of the interface as a string.
    /// E.g., 'web3.utils.keccak256("ERC777TokensRecipient")' for the 'ERC777TokensRecipient' interface.
    /// @param _implementer Contract address implementing '_interfaceHash' for '_addr'.
    function setInterfaceImplementer(address _addr, bytes32 _interfaceHash, address _implementer) external {
        address addr = _addr == address(0) ? msg.sender : _addr;
        require(getManager(addr) == msg.sender, "Not the manager");

        require(!isERC165Interface(_interfaceHash), "Must not be an ERC165 hash");
        if (_implementer != address(0) && _implementer != msg.sender) {
            require(
                ERC1820ImplementerInterface(_implementer)
                    .canImplementInterfaceForAddress(_interfaceHash, addr) == ERC1820_ACCEPT_MAGIC,
                "Does not implement the interface"
            );
        }
        interfaces[addr][_interfaceHash] = _implementer;
        emit InterfaceImplementerSet(addr, _interfaceHash, _implementer);
    }

    /// @notice Sets '_newManager' as manager for '_addr'.
    /// The new manager will be able to call 'setInterfaceImplementer' for '_addr'.
    /// @param _addr Address for which to set the new manager.
    /// @param _newManager Address of the new manager for 'addr'. (Pass '0x0' to reset the manager to '_addr'.)
    function setManager(address _addr, address _newManager) external {
        require(getManager(_addr) == msg.sender, "Not the manager");
        managers[_addr] = _newManager == _addr ? address(0) : _newManager;
        emit ManagerChanged(_addr, _newManager);
    }

    /// @notice Get the manager of an address.
    /// @param _addr Address for which to return the manager.
    /// @return Address of the manager for a given address.
    function getManager(address _addr) public view returns(address) {
        // By default the manager of an address is the same address
        if (managers[_addr] == address(0)) {
            return _addr;
        } else {
            return managers[_addr];
        }
    }

    /// @notice Compute the keccak256 hash of an interface given its name.
    /// @param _interfaceName Name of the interface.
    /// @return The keccak256 hash of an interface name.
    function interfaceHash(string calldata _interfaceName) external pure returns(bytes32) {
        return keccak256(abi.encodePacked(_interfaceName));
    }

    /* --- ERC165 Related Functions --- */
    /* --- Developed in collaboration with William Entriken. --- */

    /// @notice Updates the cache with whether the contract implements an ERC165 interface or not.
    /// @param _contract Address of the contract for which to update the cache.
    /// @param _interfaceId ERC165 interface for which to update the cache.
    function updateERC165Cache(address _contract, bytes4 _interfaceId) external {
        interfaces[_contract][_interfaceId] = implementsERC165InterfaceNoCache(
            _contract, _interfaceId) ? _contract : address(0);
        erc165Cached[_contract][_interfaceId] = true;
    }

    /// @notice Checks whether a contract implements an ERC165 interface or not.
    //  If the result is not cached a direct lookup on the contract address is performed.
    //  If the result is not cached or the cached value is out-of-date, the cache MUST be updated manually by calling
    //  'updateERC165Cache' with the contract address.
    /// @param _contract Address of the contract to check.
    /// @param _interfaceId ERC165 interface to check.
    /// @return True if '_contract' implements '_interfaceId', false otherwise.
    function implementsERC165Interface(address _contract, bytes4 _interfaceId) public view returns (bool) {
        if (!erc165Cached[_contract][_interfaceId]) {
            return implementsERC165InterfaceNoCache(_contract, _interfaceId);
        }
        return interfaces[_contract][_interfaceId] == _contract;
    }

    /// @notice Checks whether a contract implements an ERC165 interface or not without using nor updating the cache.
    /// @param _contract Address of the contract to check.
    /// @param _interfaceId ERC165 interface to check.
    /// @return True if '_contract' implements '_interfaceId', false otherwise.
    function implementsERC165InterfaceNoCache(address _contract, bytes4 _interfaceId) public view returns (bool) {
        uint256 success;
        uint256 result;

        (success, result) = noThrowCall(_contract, ERC165ID);
        if (success == 0 || result == 0) {
            return false;
        }

        (success, result) = noThrowCall(_contract, INVALID_ID);
        if (success == 0 || result != 0) {
            return false;
        }

        (success, result) = noThrowCall(_contract, _interfaceId);
        if (success == 1 && result == 1) {
            return true;
        }
        return false;
    }

    /// @notice Checks whether the hash is a ERC165 interface (ending with 28 zeroes) or not.
    /// @param _interfaceHash The hash to check.
    /// @return True if '_interfaceHash' is an ERC165 interface (ending with 28 zeroes), false otherwise.
    function isERC165Interface(bytes32 _interfaceHash) internal pure returns (bool) {
        return _interfaceHash & 0x00000000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF == 0;
    }

    /// @dev Make a call on a contract without throwing if the function does not exist.
    function noThrowCall(address _contract, bytes4 _interfaceId)
        internal view returns (uint256 success, uint256 result)
    {
        bytes4 erc165ID = ERC165ID;

        assembly {
            let x := mload(0x40)               // Find empty storage location using "free memory pointer"
            mstore(x, erc165ID)                // Place signature at beginning of empty storage
            mstore(add(x, 0x04), _interfaceId) // Place first argument directly next to signature

            success := staticcall(
                30000,                         // 30k gas
                _contract,                     // To addr
                x,                             // Inputs are stored at location x
                0x24,                          // Inputs are 36 (4 + 32) bytes long
                x,                             // Store output over input (saves space)
                0x20                           // Outputs are 32 bytes long
            )

            result := mload(x)                 // Load the result
        }
    }
}

Contract Security Audit

Contract ABI

[{"constant":false,"inputs":[{"name":"_addr","type":"address"},{"name":"_interfaceHash","type":"bytes32"},{"name":"_implementer","type":"address"}],"name":"setInterfaceImplementer","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_addr","type":"address"}],"name":"getManager","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"_addr","type":"address"},{"name":"_newManager","type":"address"}],"name":"setManager","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_interfaceName","type":"string"}],"name":"interfaceHash","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":false,"inputs":[{"name":"_contract","type":"address"},{"name":"_interfaceId","type":"bytes4"}],"name":"updateERC165Cache","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"_addr","type":"address"},{"name":"_interfaceHash","type":"bytes32"}],"name":"getInterfaceImplementer","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_contract","type":"address"},{"name":"_interfaceId","type":"bytes4"}],"name":"implementsERC165InterfaceNoCache","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"_contract","type":"address"},{"name":"_interfaceId","type":"bytes4"}],"name":"implementsERC165Interface","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"anonymous":false,"inputs":[{"indexed":true,"name":"addr","type":"address"},{"indexed":true,"name":"interfaceHash","type":"bytes32"},{"indexed":true,"name":"implementer","type":"address"}],"name":"InterfaceImplementerSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"addr","type":"address"},{"indexed":true,"name":"newManager","type":"address"}],"name":"ManagerChanged","type":"event"}]

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Deployed Bytecode

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Swarm Source

bzzr://377f4a2d4301ede9949f163f319021a6e9c687c292a5e2b2c4734c126b524e6c

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