ERC-20
DEX
Overview
Max Total Supply
50,000,000 NUX
Holders
2,077 (0.00%)
Market
Price
$0.01 @ 0.000002 ETH (-6.23%)
Onchain Market Cap
$381,818.50
Circulating Supply Market Cap
$381,818.00
Other Info
Token Contract (WITH 18 Decimals)
Balance
2,900 NUXValue
$22.15 ( ~0.0070820719373452 Eth) [0.0058%]Loading...
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Minimal Proxy Contract for 0x64ac67f8715cac475d3029ee7c05b756fb0b27b5
Contract Name:
AssetProxy
Compiler Version
v0.5.8+commit.23d335f2
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2020-07-30 */ /** *Submitted for verification at Etherscan.io on 2019-05-28 */ // File: contracts/EToken2Interface.sol pragma solidity 0.5.8; contract RegistryICAPInterface { function parse(bytes32 _icap) public view returns(address, bytes32, bool); function institutions(bytes32 _institution) public view returns(address); } contract EToken2Interface { function registryICAP() public view returns(RegistryICAPInterface); function baseUnit(bytes32 _symbol) public view returns(uint8); function description(bytes32 _symbol) public view returns(string memory); function owner(bytes32 _symbol) public view returns(address); function isOwner(address _owner, bytes32 _symbol) public view returns(bool); function totalSupply(bytes32 _symbol) public view returns(uint); function balanceOf(address _holder, bytes32 _symbol) public view returns(uint); function isLocked(bytes32 _symbol) public view returns(bool); function issueAsset( bytes32 _symbol, uint _value, string memory _name, string memory _description, uint8 _baseUnit, bool _isReissuable) public returns(bool); function reissueAsset(bytes32 _symbol, uint _value) public returns(bool); function revokeAsset(bytes32 _symbol, uint _value) public returns(bool); function setProxy(address _address, bytes32 _symbol) public returns(bool); function lockAsset(bytes32 _symbol) public returns(bool); function proxyTransferFromToICAPWithReference( address _from, bytes32 _icap, uint _value, string memory _reference, address _sender) public returns(bool); function proxyApprove(address _spender, uint _value, bytes32 _symbol, address _sender) public returns(bool); function allowance(address _from, address _spender, bytes32 _symbol) public view returns(uint); function proxyTransferFromWithReference( address _from, address _to, uint _value, bytes32 _symbol, string memory _reference, address _sender) public returns(bool); function changeOwnership(bytes32 _symbol, address _newOwner) public returns(bool); } // File: contracts/AssetInterface.sol pragma solidity 0.5.8; contract AssetInterface { function _performTransferWithReference( address _to, uint _value, string memory _reference, address _sender) public returns(bool); function _performTransferToICAPWithReference( bytes32 _icap, uint _value, string memory _reference, address _sender) public returns(bool); function _performApprove(address _spender, uint _value, address _sender) public returns(bool); function _performTransferFromWithReference( address _from, address _to, uint _value, string memory _reference, address _sender) public returns(bool); function _performTransferFromToICAPWithReference( address _from, bytes32 _icap, uint _value, string memory _reference, address _sender) public returns(bool); function _performGeneric(bytes memory, address) public payable { revert(); } } // File: contracts/ERC20Interface.sol pragma solidity 0.5.8; contract ERC20Interface { event Transfer(address indexed from, address indexed to, uint256 value); event Approval(address indexed from, address indexed spender, uint256 value); function totalSupply() public view returns(uint256 supply); function balanceOf(address _owner) public view returns(uint256 balance); // solhint-disable-next-line no-simple-event-func-name function transfer(address _to, uint256 _value) public returns(bool success); function transferFrom(address _from, address _to, uint256 _value) public returns(bool success); function approve(address _spender, uint256 _value) public returns(bool success); function allowance(address _owner, address _spender) public view returns(uint256 remaining); // function symbol() constant returns(string); function decimals() public view returns(uint8); // function name() constant returns(string); } // File: contracts/AssetProxyInterface.sol pragma solidity 0.5.8; contract AssetProxyInterface is ERC20Interface { function _forwardApprove(address _spender, uint _value, address _sender) public returns(bool); function _forwardTransferFromWithReference( address _from, address _to, uint _value, string memory _reference, address _sender) public returns(bool); function _forwardTransferFromToICAPWithReference( address _from, bytes32 _icap, uint _value, string memory _reference, address _sender) public returns(bool); function recoverTokens(ERC20Interface _asset, address _receiver, uint _value) public returns(bool); function etoken2() external view returns(address); // To be replaced by the implicit getter; // To be replaced by the implicit getter; function etoken2Symbol() external view returns(bytes32); } // File: smart-contracts-common/contracts/Bytes32.sol pragma solidity 0.5.8; contract Bytes32 { function _bytes32(string memory _input) internal pure returns(bytes32 result) { assembly { result := mload(add(_input, 32)) } } } // File: smart-contracts-common/contracts/ReturnData.sol pragma solidity 0.5.8; contract ReturnData { function _returnReturnData(bool _success) internal pure { assembly { let returndatastart := 0 returndatacopy(returndatastart, 0, returndatasize) switch _success case 0 { revert(returndatastart, returndatasize) } default { return(returndatastart, returndatasize) } } } function _assemblyCall(address _destination, uint _value, bytes memory _data) internal returns(bool success) { assembly { success := call(gas, _destination, _value, add(_data, 32), mload(_data), 0, 0) } } } // File: contracts/AssetProxy.sol pragma solidity 0.5.8; /** * @title EToken2 Asset Proxy. * * Proxy implements ERC20 interface and acts as a gateway to a single EToken2 asset. * Proxy adds etoken2Symbol and caller(sender) when forwarding requests to EToken2. * Every request that is made by caller first sent to the specific asset implementation * contract, which then calls back to be forwarded onto EToken2. * * Calls flow: Caller -> * Proxy.func(...) -> * Asset._performFunc(..., Caller.address) -> * Proxy._forwardFunc(..., Caller.address) -> * Platform.proxyFunc(..., symbol, Caller.address) * * Generic call flow: Caller -> * Proxy.unknownFunc(...) -> * Asset._performGeneric(..., Caller.address) -> * Asset.unknownFunc(...) * * Asset implementation contract is mutable, but each user have an option to stick with * old implementation, through explicit decision made in timely manner, if he doesn't agree * with new rules. * Each user have a possibility to upgrade to latest asset contract implementation, without the * possibility to rollback. * * Note: all the non constant functions return false instead of throwing in case if state change * didn't happen yet. */ contract AssetProxy is ERC20Interface, AssetProxyInterface, Bytes32, ReturnData { // Assigned EToken2, immutable. EToken2Interface public etoken2; // Assigned symbol, immutable. bytes32 public etoken2Symbol; // Assigned name, immutable. For UI. string public name; string public symbol; /** * Sets EToken2 address, assigns symbol and name. * * Can be set only once. * * @param _etoken2 EToken2 contract address. * @param _symbol assigned symbol. * @param _name assigned name. * * @return success. */ function init(EToken2Interface _etoken2, string memory _symbol, string memory _name) public returns(bool) { if (address(etoken2) != address(0)) { return false; } etoken2 = _etoken2; etoken2Symbol = _bytes32(_symbol); name = _name; symbol = _symbol; return true; } /** * Only EToken2 is allowed to call. */ modifier onlyEToken2() { if (msg.sender == address(etoken2)) { _; } } /** * Only current asset owner is allowed to call. */ modifier onlyAssetOwner() { if (etoken2.isOwner(msg.sender, etoken2Symbol)) { _; } } /** * Returns asset implementation contract for current caller. * * @return asset implementation contract. */ function _getAsset() internal view returns(AssetInterface) { return AssetInterface(getVersionFor(msg.sender)); } /** * Recovers tokens on proxy contract * * @param _asset type of tokens to recover. * @param _value tokens that will be recovered. * @param _receiver address where to send recovered tokens. * * @return success. */ function recoverTokens(ERC20Interface _asset, address _receiver, uint _value) public onlyAssetOwner() returns(bool) { return _asset.transfer(_receiver, _value); } /** * Returns asset total supply. * * @return asset total supply. */ function totalSupply() public view returns(uint) { return etoken2.totalSupply(etoken2Symbol); } /** * Returns asset balance for a particular holder. * * @param _owner holder address. * * @return holder balance. */ function balanceOf(address _owner) public view returns(uint) { return etoken2.balanceOf(_owner, etoken2Symbol); } /** * Returns asset allowance from one holder to another. * * @param _from holder that allowed spending. * @param _spender holder that is allowed to spend. * * @return holder to spender allowance. */ function allowance(address _from, address _spender) public view returns(uint) { return etoken2.allowance(_from, _spender, etoken2Symbol); } /** * Returns asset decimals. * * @return asset decimals. */ function decimals() public view returns(uint8) { return etoken2.baseUnit(etoken2Symbol); } /** * Transfers asset balance from the caller to specified receiver. * * @param _to holder address to give to. * @param _value amount to transfer. * * @return success. */ function transfer(address _to, uint _value) public returns(bool) { return transferWithReference(_to, _value, ''); } /** * Transfers asset balance from the caller to specified receiver adding specified comment. * Resolves asset implementation contract for the caller and forwards there arguments along with * the caller address. * * @param _to holder address to give to. * @param _value amount to transfer. * @param _reference transfer comment to be included in a EToken2's Transfer event. * * @return success. */ function transferWithReference(address _to, uint _value, string memory _reference) public returns(bool) { return _getAsset()._performTransferWithReference( _to, _value, _reference, msg.sender); } /** * Transfers asset balance from the caller to specified ICAP. * * @param _icap recipient ICAP to give to. * @param _value amount to transfer. * * @return success. */ function transferToICAP(bytes32 _icap, uint _value) public returns(bool) { return transferToICAPWithReference(_icap, _value, ''); } /** * Transfers asset balance from the caller to specified ICAP adding specified comment. * Resolves asset implementation contract for the caller and forwards there arguments along with * the caller address. * * @param _icap recipient ICAP to give to. * @param _value amount to transfer. * @param _reference transfer comment to be included in a EToken2's Transfer event. * * @return success. */ function transferToICAPWithReference( bytes32 _icap, uint _value, string memory _reference) public returns(bool) { return _getAsset()._performTransferToICAPWithReference( _icap, _value, _reference, msg.sender); } /** * Prforms allowance transfer of asset balance between holders. * * @param _from holder address to take from. * @param _to holder address to give to. * @param _value amount to transfer. * * @return success. */ function transferFrom(address _from, address _to, uint _value) public returns(bool) { return transferFromWithReference(_from, _to, _value, ''); } /** * Prforms allowance transfer of asset balance between holders adding specified comment. * Resolves asset implementation contract for the caller and forwards there arguments along with * the caller address. * * @param _from holder address to take from. * @param _to holder address to give to. * @param _value amount to transfer. * @param _reference transfer comment to be included in a EToken2's Transfer event. * * @return success. */ function transferFromWithReference( address _from, address _to, uint _value, string memory _reference) public returns(bool) { return _getAsset()._performTransferFromWithReference( _from, _to, _value, _reference, msg.sender ); } /** * Performs transfer call on the EToken2 by the name of specified sender. * * Can only be called by asset implementation contract assigned to sender. * * @param _from holder address to take from. * @param _to holder address to give to. * @param _value amount to transfer. * @param _reference transfer comment to be included in a EToken2's Transfer event. * @param _sender initial caller. * * @return success. */ function _forwardTransferFromWithReference( address _from, address _to, uint _value, string memory _reference, address _sender) public onlyImplementationFor(_sender) returns(bool) { return etoken2.proxyTransferFromWithReference( _from, _to, _value, etoken2Symbol, _reference, _sender ); } /** * Prforms allowance transfer of asset balance between holders. * * @param _from holder address to take from. * @param _icap recipient ICAP address to give to. * @param _value amount to transfer. * * @return success. */ function transferFromToICAP(address _from, bytes32 _icap, uint _value) public returns(bool) { return transferFromToICAPWithReference(_from, _icap, _value, ''); } /** * Prforms allowance transfer of asset balance between holders adding specified comment. * Resolves asset implementation contract for the caller and forwards there arguments along with * the caller address. * * @param _from holder address to take from. * @param _icap recipient ICAP address to give to. * @param _value amount to transfer. * @param _reference transfer comment to be included in a EToken2's Transfer event. * * @return success. */ function transferFromToICAPWithReference( address _from, bytes32 _icap, uint _value, string memory _reference) public returns(bool) { return _getAsset()._performTransferFromToICAPWithReference( _from, _icap, _value, _reference, msg.sender ); } /** * Performs allowance transfer to ICAP call on the EToken2 by the name of specified sender. * * Can only be called by asset implementation contract assigned to sender. * * @param _from holder address to take from. * @param _icap recipient ICAP address to give to. * @param _value amount to transfer. * @param _reference transfer comment to be included in a EToken2's Transfer event. * @param _sender initial caller. * * @return success. */ function _forwardTransferFromToICAPWithReference( address _from, bytes32 _icap, uint _value, string memory _reference, address _sender) public onlyImplementationFor(_sender) returns(bool) { return etoken2.proxyTransferFromToICAPWithReference( _from, _icap, _value, _reference, _sender ); } /** * Sets asset spending allowance for a specified spender. * Resolves asset implementation contract for the caller and forwards there arguments along with * the caller address. * * @param _spender holder address to set allowance to. * @param _value amount to allow. * * @return success. */ function approve(address _spender, uint _value) public returns(bool) { return _getAsset()._performApprove(_spender, _value, msg.sender); } /** * Performs allowance setting call on the EToken2 by the name of specified sender. * * Can only be called by asset implementation contract assigned to sender. * * @param _spender holder address to set allowance to. * @param _value amount to allow. * @param _sender initial caller. * * @return success. */ function _forwardApprove(address _spender, uint _value, address _sender) public onlyImplementationFor(_sender) returns(bool) { return etoken2.proxyApprove(_spender, _value, etoken2Symbol, _sender); } /** * Emits ERC20 Transfer event on this contract. * * Can only be, and, called by assigned EToken2 when asset transfer happens. */ function emitTransfer(address _from, address _to, uint _value) public onlyEToken2() { emit Transfer(_from, _to, _value); } /** * Emits ERC20 Approval event on this contract. * * Can only be, and, called by assigned EToken2 when asset allowance set happens. */ function emitApprove(address _from, address _spender, uint _value) public onlyEToken2() { emit Approval(_from, _spender, _value); } /** * Resolves asset implementation contract for the caller and forwards there transaction data, * along with the value. This allows for proxy interface growth. */ function () external payable { _getAsset()._performGeneric.value(msg.value)(msg.data, msg.sender); _returnReturnData(true); } // Interface functions to allow specifying ICAP addresses as strings. function transferToICAP(string memory _icap, uint _value) public returns(bool) { return transferToICAPWithReference(_icap, _value, ''); } function transferToICAPWithReference(string memory _icap, uint _value, string memory _reference) public returns(bool) { return transferToICAPWithReference(_bytes32(_icap), _value, _reference); } function transferFromToICAP(address _from, string memory _icap, uint _value) public returns(bool) { return transferFromToICAPWithReference(_from, _icap, _value, ''); } function transferFromToICAPWithReference( address _from, string memory _icap, uint _value, string memory _reference) public returns(bool) { return transferFromToICAPWithReference(_from, _bytes32(_icap), _value, _reference); } /** * Indicates an upgrade freeze-time start, and the next asset implementation contract. */ event UpgradeProposed(address newVersion); event UpgradePurged(address newVersion); event UpgradeCommited(address newVersion); event OptedOut(address sender, address version); event OptedIn(address sender, address version); // Current asset implementation contract address. address internal latestVersion; // Proposed next asset implementation contract address. address internal pendingVersion; // Upgrade freeze-time start. uint internal pendingVersionTimestamp; // Timespan for users to review the new implementation and make decision. uint internal constant UPGRADE_FREEZE_TIME = 3 days; // Asset implementation contract address that user decided to stick with. // 0x0 means that user uses latest version. mapping(address => address) internal userOptOutVersion; /** * Only asset implementation contract assigned to sender is allowed to call. */ modifier onlyImplementationFor(address _sender) { if (getVersionFor(_sender) == msg.sender) { _; } } /** * Returns asset implementation contract address assigned to sender. * * @param _sender sender address. * * @return asset implementation contract address. */ function getVersionFor(address _sender) public view returns(address) { return userOptOutVersion[_sender] == address(0) ? latestVersion : userOptOutVersion[_sender]; } /** * Returns current asset implementation contract address. * * @return asset implementation contract address. */ function getLatestVersion() public view returns(address) { return latestVersion; } /** * Returns proposed next asset implementation contract address. * * @return asset implementation contract address. */ function getPendingVersion() public view returns(address) { return pendingVersion; } /** * Returns upgrade freeze-time start. * * @return freeze-time start. */ function getPendingVersionTimestamp() public view returns(uint) { return pendingVersionTimestamp; } /** * Propose next asset implementation contract address. * * Can only be called by current asset owner. * * Note: freeze-time should not be applied for the initial setup. * * @param _newVersion asset implementation contract address. * * @return success. */ function proposeUpgrade(address _newVersion) public onlyAssetOwner() returns(bool) { // Should not already be in the upgrading process. if (pendingVersion != address(0)) { return false; } // New version address should be other than 0x0. if (_newVersion == address(0)) { return false; } // Don't apply freeze-time for the initial setup. if (latestVersion == address(0)) { latestVersion = _newVersion; return true; } pendingVersion = _newVersion; // solhint-disable-next-line not-rely-on-time pendingVersionTimestamp = now; emit UpgradeProposed(_newVersion); return true; } /** * Cancel the pending upgrade process. * * Can only be called by current asset owner. * * @return success. */ function purgeUpgrade() public onlyAssetOwner() returns(bool) { if (pendingVersion == address(0)) { return false; } emit UpgradePurged(pendingVersion); delete pendingVersion; delete pendingVersionTimestamp; return true; } /** * Finalize an upgrade process setting new asset implementation contract address. * * Can only be called after an upgrade freeze-time. * * @return success. */ function commitUpgrade() public returns(bool) { if (pendingVersion == address(0)) { return false; } // solhint-disable-next-line not-rely-on-time if (pendingVersionTimestamp + UPGRADE_FREEZE_TIME > now) { return false; } latestVersion = pendingVersion; delete pendingVersion; delete pendingVersionTimestamp; emit UpgradeCommited(latestVersion); return true; } /** * Disagree with proposed upgrade, and stick with current asset implementation * until further explicit agreement to upgrade. * * @return success. */ function optOut() public returns(bool) { if (userOptOutVersion[msg.sender] != address(0)) { return false; } userOptOutVersion[msg.sender] = latestVersion; emit OptedOut(msg.sender, latestVersion); return true; } /** * Implicitly agree to upgrade to current and future asset implementation upgrades, * until further explicit disagreement. * * @return success. */ function optIn() public returns(bool) { delete userOptOutVersion[msg.sender]; emit OptedIn(msg.sender, latestVersion); return true; } // Backwards compatibility. function multiAsset() public view returns(EToken2Interface) { return etoken2; } }
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A token is a representation of an on-chain or off-chain asset. The token page shows information such as price, total supply, holders, transfers and social links. Learn more about this page in our Knowledge Base.