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TokenTracker
Latest 25 from a total of 93 transactions
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Transfer | 18685204 | 449 days ago | IN | 0 ETH | 0.0028377 | ||||
Transfer From | 18663507 | 452 days ago | IN | 0 ETH | 0.00135042 | ||||
Transfer From | 18663362 | 452 days ago | IN | 0 ETH | 0.00126353 | ||||
Transfer From | 18628148 | 457 days ago | IN | 0 ETH | 0.00172231 | ||||
Approve | 18628087 | 457 days ago | IN | 0 ETH | 0.00187822 | ||||
Approve | 18628085 | 457 days ago | IN | 0 ETH | 0.00200303 | ||||
Approve | 18628084 | 457 days ago | IN | 0 ETH | 0.00209751 | ||||
Transfer From | 18628083 | 457 days ago | IN | 0 ETH | 0.00170997 | ||||
Transfer From | 18627328 | 457 days ago | IN | 0 ETH | 0.00113841 | ||||
Transfer | 17024336 | 682 days ago | IN | 0 ETH | 0.00096351 | ||||
Approve | 16066554 | 816 days ago | IN | 0 ETH | 0.00040913 | ||||
Transfer From | 16065343 | 816 days ago | IN | 0 ETH | 0.00035185 | ||||
Approve | 16061032 | 817 days ago | IN | 0 ETH | 0.00046316 | ||||
Transfer | 14132639 | 1114 days ago | IN | 0 ETH | 0.0047295 | ||||
Increase Burn Al... | 14115070 | 1117 days ago | IN | 0 ETH | 0.00476229 | ||||
Transfer | 14069318 | 1124 days ago | IN | 0 ETH | 0.00734539 | ||||
Transfer | 13715868 | 1179 days ago | IN | 0 ETH | 0.00875168 | ||||
Transfer From | 13435348 | 1223 days ago | IN | 0 ETH | 0.00256552 | ||||
Approve | 13435327 | 1223 days ago | IN | 0 ETH | 0.00325528 | ||||
Transfer | 13271034 | 1249 days ago | IN | 0 ETH | 0.00781245 | ||||
Transfer | 13143466 | 1268 days ago | IN | 0 ETH | 0.00531891 | ||||
Transfer | 12266524 | 1405 days ago | IN | 0 ETH | 0.00681609 | ||||
Transfer | 12266519 | 1405 days ago | IN | 0 ETH | 0.00683692 | ||||
Transfer | 12140124 | 1424 days ago | IN | 0 ETH | 0.00799536 | ||||
Transfer | 12117642 | 1427 days ago | IN | 0 ETH | 0.00424362 |
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Contract Source Code Verified (Exact Match)
Contract Name:
UniversalBitcoin
Compiler Version
v0.5.0+commit.1d4f565a
Optimization Enabled:
Yes with 200 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2019-03-26 */ pragma solidity ^0.5.0; /** * @title Roles * @dev Library for managing addresses assigned to a Role. */ library Roles { struct Role { mapping (address => bool) bearer; } /** * @dev give an account access to this role */ function add(Role storage role, address account) internal { require(account != address(0)); require(!has(role, account)); role.bearer[account] = true; } /** * @dev remove an account's access to this role */ function remove(Role storage role, address account) internal { require(account != address(0)); require(has(role, account)); role.bearer[account] = false; } /** * @dev check if an account has this role * @return bool */ function has(Role storage role, address account) internal view returns (bool) { require(account != address(0)); return role.bearer[account]; } } contract ProxyTokenBurnerRole { using Roles for Roles.Role; event BurnerAdded(address indexed account); event BurnerRemoved(address indexed account); Roles.Role private burners; constructor() internal { _addBurner(msg.sender); } modifier onlyBurner() { require(isBurner(msg.sender), "Sender does not have a burner role"); _; } function isBurner(address account) public view returns (bool) { return burners.has(account); } function addBurner(address account) public onlyBurner { _addBurner(account); } function renounceBurner() public { _removeBurner(msg.sender); } function _addBurner(address account) internal { burners.add(account); emit BurnerAdded(account); } function _removeBurner(address account) internal { burners.remove(account); emit BurnerRemoved(account); } } /** * @title ERC20 interface * @dev see https://github.com/ethereum/EIPs/issues/20 */ interface IERC20 { function transfer(address to, uint256 value) external returns (bool); function approve(address spender, uint256 value) external returns (bool); function transferFrom(address from, address to, uint256 value) external returns (bool); function totalSupply() external view returns (uint256); function balanceOf(address who) external view returns (uint256); function allowance(address owner, address spender) external view returns (uint256); event Transfer(address indexed from, address indexed to, uint256 value); event Approval(address indexed owner, address indexed spender, uint256 value); } /** * @title SafeMath * @dev Unsigned math operations with safety checks that revert on error */ library SafeMath { /** * @dev Multiplies two unsigned integers, reverts on overflow. */ function mul(uint256 a, uint256 b) internal pure returns (uint256) { // Gas optimization: this is cheaper than requiring 'a' not being zero, but the // benefit is lost if 'b' is also tested. // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b); return c; } /** * @dev Integer division of two unsigned integers truncating the quotient, reverts on division by zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { // Solidity only automatically asserts when dividing by 0 require(b > 0); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Subtracts two unsigned integers, reverts on overflow (i.e. if subtrahend is greater than minuend). */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { require(b <= a); uint256 c = a - b; return c; } /** * @dev Adds two unsigned integers, reverts on overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a); return c; } /** * @dev Divides two unsigned integers and returns the remainder (unsigned integer modulo), * reverts when dividing by zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { require(b != 0); return a % b; } } /** * @title Standard ERC20 token * * @dev Implementation of the basic standard token. * https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md * Originally based on code by FirstBlood: * https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol * * This implementation emits additional Approval events, allowing applications to reconstruct the allowance status for * all accounts just by listening to said events. Note that this isn't required by the specification, and other * compliant implementations may not do it. */ contract ERC20 is IERC20 { using SafeMath for uint256; mapping (address => uint256) private _balances; mapping (address => mapping (address => uint256)) private _allowed; uint256 private _totalSupply; /** * @dev Total number of tokens in existence */ function totalSupply() public view returns (uint256) { return _totalSupply; } /** * @dev Gets the balance of the specified address. * @param owner The address to query the balance of. * @return An uint256 representing the amount owned by the passed address. */ function balanceOf(address owner) public view returns (uint256) { return _balances[owner]; } /** * @dev Function to check the amount of tokens that an owner allowed to a spender. * @param owner address The address which owns the funds. * @param spender address The address which will spend the funds. * @return A uint256 specifying the amount of tokens still available for the spender. */ function allowance(address owner, address spender) public view returns (uint256) { return _allowed[owner][spender]; } /** * @dev Transfer token for a specified address * @param to The address to transfer to. * @param value The amount to be transferred. */ function transfer(address to, uint256 value) public returns (bool) { _transfer(msg.sender, to, value); return true; } /** * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender. * Beware that changing an allowance with this method brings the risk that someone may use both the old * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * @param spender The address which will spend the funds. * @param value The amount of tokens to be spent. */ function approve(address spender, uint256 value) public returns (bool) { require(spender != address(0)); _allowed[msg.sender][spender] = value; emit Approval(msg.sender, spender, value); return true; } /** * @dev Transfer tokens from one address to another. * Note that while this function emits an Approval event, this is not required as per the specification, * and other compliant implementations may not emit the event. * @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 */ function transferFrom(address from, address to, uint256 value) public returns (bool) { _allowed[from][msg.sender] = _allowed[from][msg.sender].sub(value); _transfer(from, to, value); emit Approval(from, msg.sender, _allowed[from][msg.sender]); return true; } /** * @dev Increase the amount of tokens that an owner allowed to a spender. * approve should be called when allowed_[_spender] == 0. To increment * allowed value is better to use this function to avoid 2 calls (and wait until * the first transaction is mined) * From MonolithDAO Token.sol * Emits an Approval event. * @param spender The address which will spend the funds. * @param addedValue The amount of tokens to increase the allowance by. */ function increaseAllowance(address spender, uint256 addedValue) public returns (bool) { require(spender != address(0)); _allowed[msg.sender][spender] = _allowed[msg.sender][spender].add(addedValue); emit Approval(msg.sender, spender, _allowed[msg.sender][spender]); return true; } /** * @dev Decrease the amount of tokens that an owner allowed to a spender. * approve should be called when allowed_[_spender] == 0. To decrement * allowed value is better to use this function to avoid 2 calls (and wait until * the first transaction is mined) * From MonolithDAO Token.sol * Emits an Approval event. * @param spender The address which will spend the funds. * @param subtractedValue The amount of tokens to decrease the allowance by. */ function decreaseAllowance(address spender, uint256 subtractedValue) public returns (bool) { require(spender != address(0)); _allowed[msg.sender][spender] = _allowed[msg.sender][spender].sub(subtractedValue); emit Approval(msg.sender, spender, _allowed[msg.sender][spender]); return true; } /** * @dev Transfer token for a specified addresses * @param from The address to transfer from. * @param to The address to transfer to. * @param value The amount to be transferred. */ function _transfer(address from, address to, uint256 value) internal { require(to != address(0)); _balances[from] = _balances[from].sub(value); _balances[to] = _balances[to].add(value); emit Transfer(from, to, value); } /** * @dev Internal function that mints an amount of the token and assigns it to * an account. This encapsulates the modification of balances such that the * proper events are emitted. * @param account The account that will receive the created tokens. * @param value The amount that will be created. */ function _mint(address account, uint256 value) internal { require(account != address(0)); _totalSupply = _totalSupply.add(value); _balances[account] = _balances[account].add(value); emit Transfer(address(0), account, value); } /** * @dev Internal function that burns an amount of the token of a given * account. * @param account The account whose tokens will be burnt. * @param value The amount that will be burnt. */ function _burn(address account, uint256 value) internal { require(account != address(0)); _totalSupply = _totalSupply.sub(value); _balances[account] = _balances[account].sub(value); emit Transfer(account, address(0), value); } /** * @dev Internal function that burns an amount of the token of a given * account, deducting from the sender's allowance for said account. Uses the * internal burn function. * Emits an Approval event (reflecting the reduced allowance). * @param account The account whose tokens will be burnt. * @param value The amount that will be burnt. */ function _burnFrom(address account, uint256 value) internal { _allowed[account][msg.sender] = _allowed[account][msg.sender].sub(value); _burn(account, value); emit Approval(account, msg.sender, _allowed[account][msg.sender]); } } /** * @title Burnable Token * @dev Token that can be irreversibly burned (destroyed). */ contract ProxyTokenBurnable is ERC20, ProxyTokenBurnerRole { mapping (address => mapping (address => uint256)) private _burnAllowed; event BurnApproval(address indexed owner, address indexed spender, uint256 value); /** * @dev Modifier to check if a burner can burn a specific amount of owner's tokens. * @param burner address The address which will burn the funds. * @param owner address The address which owns the funds. * @param amount uint256 The amount of tokens to burn. */ modifier onlyWithBurnAllowance(address burner, address owner, uint256 amount) { if (burner != owner) { require(burnAllowance(owner, burner) >= amount, "Not enough burn allowance"); } _; } /** * @dev Function to check the amount of tokens that an owner allowed to burn. * @param owner address The address which owns the funds. * @param burner address The address which will burn the funds. * @return A uint256 specifying the amount of tokens still available to burn. */ function burnAllowance(address owner, address burner) public view returns (uint256) { return _burnAllowed[owner][burner]; } /** * @dev Increase the amount of tokens that an owner allowed to a burner to burn. * @param burner The address which will burn the funds. * @param addedValue The increased amount of tokens to be burnt. */ function increaseBurnAllowance(address burner, uint256 addedValue) public returns (bool) { require(burner != address(0), "Invalid burner address"); _burnAllowed[msg.sender][burner] = _burnAllowed[msg.sender][burner].add(addedValue); emit BurnApproval(msg.sender, burner, _burnAllowed[msg.sender][burner]); return true; } /** * @dev Decrease the amount of tokens that an owner allowed to a burner to burn. * @param burner The address which will burn the funds. * @param subtractedValue The subtractedValue amount of tokens to be burnt. */ function decreaseBurnAllowance(address burner, uint256 subtractedValue) public returns (bool) { require(burner != address(0), "Invalid burner address"); _burnAllowed[msg.sender][burner] = _burnAllowed[msg.sender][burner].sub(subtractedValue); emit BurnApproval(msg.sender, burner, _burnAllowed[msg.sender][burner]); return true; } /** * @dev Function to burn tokens * @param amount The amount of tokens to burn. * @return A boolean that indicates if the operation was successful. */ function burn(uint256 amount) public onlyBurner returns (bool) { _burn(msg.sender, amount); return true; } /** * @dev Burns a specific amount of tokens from the target address and decrements allowance * @param account address The address which you want to send tokens from * @param amount uint256 The amount of token to be burned */ function burnFrom(address account, uint256 amount) public onlyBurner onlyWithBurnAllowance(msg.sender, account, amount) returns (bool) { _burnAllowed[account][msg.sender] = _burnAllowed[account][msg.sender].sub(amount); _burn(account, amount); emit BurnApproval(account, msg.sender, _burnAllowed[account][msg.sender]); return true; } } /** * @title ERC20Detailed token * @dev The decimals are only for visualization purposes. * All the operations are done using the smallest and indivisible token unit, * just as on Ethereum all the operations are done in wei. */ contract ERC20Detailed is IERC20 { string private _name; string private _symbol; uint8 private _decimals; constructor (string memory name, string memory symbol, uint8 decimals) public { _name = name; _symbol = symbol; _decimals = decimals; } /** * @return the name of the token. */ function name() public view returns (string memory) { return _name; } /** * @return the symbol of the token. */ function symbol() public view returns (string memory) { return _symbol; } /** * @return the number of decimals of the token. */ function decimals() public view returns (uint8) { return _decimals; } } contract MinterRole { using Roles for Roles.Role; event MinterAdded(address indexed account); event MinterRemoved(address indexed account); Roles.Role private _minters; constructor () internal { _addMinter(msg.sender); } modifier onlyMinter() { require(isMinter(msg.sender)); _; } function isMinter(address account) public view returns (bool) { return _minters.has(account); } function addMinter(address account) public onlyMinter { _addMinter(account); } function renounceMinter() public { _removeMinter(msg.sender); } function _addMinter(address account) internal { _minters.add(account); emit MinterAdded(account); } function _removeMinter(address account) internal { _minters.remove(account); emit MinterRemoved(account); } } /** * @title ERC20Mintable * @dev ERC20 minting logic */ contract ERC20Mintable is ERC20, MinterRole { /** * @dev Function to mint tokens * @param to The address that will receive the minted tokens. * @param value The amount of tokens to mint. * @return A boolean that indicates if the operation was successful. */ function mint(address to, uint256 value) public onlyMinter returns (bool) { _mint(to, value); return true; } } /** * @title ProxyToken */ contract ProxyToken is ERC20, ERC20Detailed, ERC20Mintable, ProxyTokenBurnable { /** * @notice Constructor for the ProxyToken * @param owner owner of the initial proxy tokens * @param name name of the proxy token * @param symbol symbol of the proxy token * @param decimals divisibility of proxy token * @param initialProxySupply initial amount of proxy tokens */ constructor( address owner, string memory name, string memory symbol, uint8 decimals, uint256 initialProxySupply) public ERC20Detailed(name, symbol, decimals) { mint(owner, initialProxySupply * (10 ** uint256(decimals))); if (owner == msg.sender) { return; } addBurner(owner); addMinter(owner); renounceBurner(); renounceMinter(); } } /** * @title UniversalBitcoin */ contract UniversalBitcoin is ProxyToken { /** * @notice Constructor for the UniversalBitcoin * @param owner owner of the initial proxy tokens */ constructor(address owner) public ProxyToken(owner, "Universal Bitcoin", "UPBTC", 8, 0) {} // solium-disable-line no-empty-blocks }
Contract Security Audit
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Contract Creation Code
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Deployed Bytecode
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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)
000000000000000000000000a4c40e2c901aa485535d9bcba793fa7b17e1bc0a
-----Decoded View---------------
Arg [0] : owner (address): 0xA4C40E2c901AA485535D9bcBA793FA7B17e1bc0A
-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 000000000000000000000000a4c40e2c901aa485535d9bcba793fa7b17e1bc0a
Swarm Source
bzzr://616dbdefee5f56485be0b4cbdd7410217f354a33752ecfa465a4ad5a80ccbe22
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OVERVIEW
UPBTC is fully collateralized on a 1-1 basis with BTC stored at a segregated wallets. Leveraging the efficiency and transparency of blockchain and issued by the Universal Protocol Alliance.Multichain Portfolio | 31 Chains
Chain | Token | Portfolio % | Price | Amount | Value |
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A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.