ERC-1155
Overview
Max Total Supply
1,000 YOTWBP
Holders
911
Total Transfers
-
Market
Volume (24H)
N/A
Min Price (24H)
N/A
Max Price (24H)
N/A
Other Info
Token Contract
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# | Exchange | Pair | Price | 24H Volume | % Volume |
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Minimal Proxy Contract for 0xc0b257fe1ab2c52a0d58538dc1aa3376c8af69ff
Contract Name:
Unifty
Compiler Version
v0.5.17+commit.d19bba13
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2020-11-12 */ pragma solidity ^0.5.17; contract CloneFactory { function createClone(address target) internal returns (address result) { bytes20 targetBytes = bytes20(target); assembly { let clone := mload(0x40) mstore(clone, 0x3d602d80600a3d3981f3363d3d373d3d3d363d73000000000000000000000000) mstore(add(clone, 0x14), targetBytes) mstore(add(clone, 0x28), 0x5af43d82803e903d91602b57fd5bf30000000000000000000000000000000000) result := create(0, clone, 0x37) } } } /** * @dev Interface of the ERC20 standard as defined in the EIP. Does not include * the optional functions; to access them see {ERC20Detailed}. */ interface IERC20 { /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by `account`. */ function balanceOf(address account) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transfer(address recipient, uint256 amount) external returns (bool); /** * @dev Returns the remaining number of tokens that `spender` will be * allowed to spend on behalf of `owner` through {transferFrom}. This is * zero by default. * * This value changes when {approve} or {transferFrom} are called. */ function allowance(address owner, address spender) external view returns (uint256); /** * @dev Sets `amount` as the allowance of `spender` over the caller's tokens. * * Returns a boolean value indicating whether the operation succeeded. * * IMPORTANT: Beware that changing an allowance with this method brings the risk * that someone may use both the old and the new allowance by unfortunate * transaction ordering. One possible solution to mitigate this race * condition is to first reduce the spender's allowance to 0 and set the * desired value afterwards: * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729 * * Emits an {Approval} event. */ function approve(address spender, uint256 amount) external returns (bool); /** * @dev Moves `amount` tokens from `sender` to `recipient` using the * allowance mechanism. `amount` is then deducted from the caller's * allowance. * * Returns a boolean value indicating whether the operation succeeded. * * Emits a {Transfer} event. */ function transferFrom(address sender, address recipient, uint256 amount) external returns (bool); /** * @dev Emitted when `value` tokens are moved from one account (`from`) to * another (`to`). * * Note that `value` may be zero. */ event Transfer(address indexed from, address indexed to, uint256 value); /** * @dev Emitted when the allowance of a `spender` for an `owner` is set by * a call to {approve}. `value` is the new allowance. */ event Approval(address indexed owner, address indexed spender, uint256 value); } /** * @title SafeERC20 * @dev Wrappers around ERC20 operations that throw on failure (when the token * contract returns false). Tokens that return no value (and instead revert or * throw on failure) are also supported, non-reverting calls are assumed to be * successful. * To use this library you can add a `using SafeERC20 for ERC20;` statement to your contract, * which allows you to call the safe operations as `token.safeTransfer(...)`, etc. */ library SafeERC20 { using SafeMath for uint256; using Address for address; function safeTransfer(IERC20 token, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transfer.selector, to, value)); } function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal { _callOptionalReturn(token, abi.encodeWithSelector(token.transferFrom.selector, from, to, value)); } /** * @dev Deprecated. This function has issues similar to the ones found in * {IERC20-approve}, and its usage is discouraged. * * Whenever possible, use {safeIncreaseAllowance} and * {safeDecreaseAllowance} instead. */ function safeApprove(IERC20 token, address spender, uint256 value) internal { // safeApprove should only be called when setting an initial allowance, // or when resetting it to zero. To increase and decrease it, use // 'safeIncreaseAllowance' and 'safeDecreaseAllowance' // solhint-disable-next-line max-line-length require((value == 0) || (token.allowance(address(this), spender) == 0), "SafeERC20: approve from non-zero to non-zero allowance" ); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, value)); } function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).add(value); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } function safeDecreaseAllowance(IERC20 token, address spender, uint256 value) internal { uint256 newAllowance = token.allowance(address(this), spender).sub(value); _callOptionalReturn(token, abi.encodeWithSelector(token.approve.selector, spender, newAllowance)); } /** * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement * on the return value: the return value is optional (but if data is returned, it must not be false). * @param token The token targeted by the call. * @param data The call data (encoded using abi.encode or one of its variants). */ function _callOptionalReturn(IERC20 token, bytes memory data) private { // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that // the target address contains contract code and also asserts for success in the low-level call. bytes memory returndata = address(token).functionCall(data, "SafeERC20: low-level call failed"); if (returndata.length > 0) { // Return data is optional // solhint-disable-next-line max-line-length require(abi.decode(returndata, (bool)), "SafeERC20: ERC20 operation did not succeed"); } } } /* * @dev Provides information about the current execution context, including the * sender of the transaction and its data. While these are generally available * via msg.sender and msg.data, they should not be accessed in such a direct * manner, since when dealing with GSN meta-transactions the account sending and * paying for execution may not be the actual sender (as far as an application * is concerned). * * This contract is only required for intermediate, library-like contracts. */ contract Context { // Empty internal constructor, to prevent people from mistakenly deploying // an instance of this contract, which should be used via inheritance. constructor () internal { } // solhint-disable-previous-line no-empty-blocks function _msgSender() internal view returns (address payable) { return msg.sender; } function _msgData() internal view returns (bytes memory) { this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691 return msg.data; } } /** * @dev Contract module which provides a basic access control mechanism, where * there is an account (an owner) that can be granted exclusive access to * specific functions. * * This module is used through inheritance. It will make available the modifier * `onlyOwner`, which can be applied to your functions to restrict their use to * the owner. */ contract Ownable is Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ constructor () internal { address msgSender = _msgSender(); _owner = msgSender; emit OwnershipTransferred(address(0), msgSender); } function initOwnable() internal{ address msgSender = _msgSender(); _owner = msgSender; emit OwnershipTransferred(address(0), msgSender); } /** * @dev Returns the address of the current owner. */ function owner() public view returns (address) { return _owner; } /** * @dev Throws if called by any account other than the owner. */ modifier onlyOwner() { require(isOwner(), "Ownable: caller is not the owner"); _; } /** * @dev Returns true if the caller is the current owner. */ function isOwner() public view returns (bool) { return _msgSender() == _owner; } /** * @dev Leaves the contract without owner. It will not be possible to call * `onlyOwner` functions anymore. Can only be called by the current owner. * * NOTE: Renouncing ownership will leave the contract without an owner, * thereby removing any functionality that is only available to the owner. */ function renounceOwnership() public onlyOwner { emit OwnershipTransferred(_owner, address(0)); _owner = address(0); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). * Can only be called by the current owner. */ function transferOwnership(address newOwner) public onlyOwner { _transferOwnership(newOwner); } /** * @dev Transfers ownership of the contract to a new account (`newOwner`). */ function _transferOwnership(address newOwner) internal { require(newOwner != address(0), "Ownable: new owner is the zero address"); emit OwnershipTransferred(_owner, newOwner); _owner = newOwner; } } /** * @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(!has(role, account), "Roles: account already has role"); role.bearer[account] = true; } /** * @dev Remove an account's access to this role. */ function remove(Role storage role, address account) internal { require(has(role, account), "Roles: account does not have role"); 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), "Roles: account is the zero address"); return role.bearer[account]; } } contract MinterRole is Context { using Roles for Roles.Role; event MinterAdded(address indexed account); event MinterRemoved(address indexed account); Roles.Role private _minters; function initMinter() internal{ _addMinter(_msgSender()); } constructor () internal { _addMinter(_msgSender()); } modifier onlyMinter() { require(isMinter(_msgSender()), "MinterRole: caller does not have the Minter role"); _; } function isMinter(address account) public view returns (bool) { return _minters.has(account); } function addMinter(address account) public onlyMinter { _addMinter(account); } function renounceMinter() public { _removeMinter(_msgSender()); } function _addMinter(address account) internal { _minters.add(account); emit MinterAdded(account); } function _removeMinter(address account) internal { _minters.remove(account); emit MinterRemoved(account); } } /** * @title WhitelistAdminRole * @dev WhitelistAdmins are responsible for assigning and removing Whitelisted accounts. */ contract WhitelistAdminRole is Context { using Roles for Roles.Role; event WhitelistAdminAdded(address indexed account); event WhitelistAdminRemoved(address indexed account); Roles.Role private _whitelistAdmins; function initWhiteListAdmin() internal{ _addWhitelistAdmin(_msgSender()); } constructor () internal { _addWhitelistAdmin(_msgSender()); } modifier onlyWhitelistAdmin() { require(isWhitelistAdmin(_msgSender()), "WhitelistAdminRole: caller does not have the WhitelistAdmin role"); _; } function isWhitelistAdmin(address account) public view returns (bool) { return _whitelistAdmins.has(account); } function addWhitelistAdmin(address account) public onlyWhitelistAdmin { _addWhitelistAdmin(account); } function renounceWhitelistAdmin() public { _removeWhitelistAdmin(_msgSender()); } function _addWhitelistAdmin(address account) internal { _whitelistAdmins.add(account); emit WhitelistAdminAdded(account); } function _removeWhitelistAdmin(address account) internal { _whitelistAdmins.remove(account); emit WhitelistAdminRemoved(account); } } /** * @title ERC165 * @dev https://github.com/ethereum/EIPs/blob/master/EIPS/eip-165.md */ interface IERC165 { /** * @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 */ function supportsInterface(bytes4 _interfaceId) external view returns (bool); } /** * @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, "SafeMath#mul: OVERFLOW"); 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, "SafeMath#div: DIVISION_BY_ZERO"); 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, "SafeMath#sub: UNDERFLOW"); 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, "SafeMath#add: OVERFLOW"); 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, "SafeMath#mod: DIVISION_BY_ZERO"); return a % b; } } /** * @dev ERC-1155 interface for accepting safe transfers. */ interface IERC1155TokenReceiver { /** * @notice Handle the receipt of a single ERC1155 token type * @dev An ERC1155-compliant smart contract MUST call this function on the token recipient contract, at the end of a `safeTransferFrom` after the balance has been updated * This function MAY throw to revert and reject the transfer * Return of other amount than the magic value MUST result in the transaction being reverted * Note: The token contract address is always the message sender * @param _operator The address which called the `safeTransferFrom` function * @param _from The address which previously owned the token * @param _id The id of the token being transferred * @param _amount The amount of tokens being transferred * @param _data Additional data with no specified format * @return `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` */ function onERC1155Received(address _operator, address _from, uint256 _id, uint256 _amount, bytes calldata _data) external returns(bytes4); /** * @notice Handle the receipt of multiple ERC1155 token types * @dev An ERC1155-compliant smart contract MUST call this function on the token recipient contract, at the end of a `safeBatchTransferFrom` after the balances have been updated * This function MAY throw to revert and reject the transfer * Return of other amount than the magic value WILL result in the transaction being reverted * Note: The token contract address is always the message sender * @param _operator The address which called the `safeBatchTransferFrom` function * @param _from The address which previously owned the token * @param _ids An array containing ids of each token being transferred * @param _amounts An array containing amounts of each token being transferred * @param _data Additional data with no specified format * @return `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` */ function onERC1155BatchReceived(address _operator, address _from, uint256[] calldata _ids, uint256[] calldata _amounts, bytes calldata _data) external returns(bytes4); /** * @notice Indicates whether a contract implements the `ERC1155TokenReceiver` functions and so can accept ERC1155 token types. * @param interfaceID The ERC-165 interface ID that is queried for support.s * @dev This function MUST return true if it implements the ERC1155TokenReceiver interface and ERC-165 interface. * This function MUST NOT consume more than 5,000 gas. * @return Wheter ERC-165 or ERC1155TokenReceiver interfaces are supported. */ function supportsInterface(bytes4 interfaceID) external view returns (bool); } interface IERC1155 { // Events /** * @dev Either TransferSingle or TransferBatch MUST emit when tokens are transferred, including zero amount transfers as well as minting or burning * Operator MUST be msg.sender * When minting/creating tokens, the `_from` field MUST be set to `0x0` * When burning/destroying tokens, the `_to` field MUST be set to `0x0` * The total amount transferred from address 0x0 minus the total amount transferred to 0x0 may be used by clients and exchanges to be added to the "circulating supply" for a given token ID * To broadcast the existence of a token ID with no initial balance, the contract SHOULD emit the TransferSingle event from `0x0` to `0x0`, with the token creator as `_operator`, and a `_amount` of 0 */ event TransferSingle(address indexed _operator, address indexed _from, address indexed _to, uint256 _id, uint256 _amount); /** * @dev Either TransferSingle or TransferBatch MUST emit when tokens are transferred, including zero amount transfers as well as minting or burning * Operator MUST be msg.sender * When minting/creating tokens, the `_from` field MUST be set to `0x0` * When burning/destroying tokens, the `_to` field MUST be set to `0x0` * The total amount transferred from address 0x0 minus the total amount transferred to 0x0 may be used by clients and exchanges to be added to the "circulating supply" for a given token ID * To broadcast the existence of multiple token IDs with no initial balance, this SHOULD emit the TransferBatch event from `0x0` to `0x0`, with the token creator as `_operator`, and a `_amount` of 0 */ event TransferBatch(address indexed _operator, address indexed _from, address indexed _to, uint256[] _ids, uint256[] _amounts); /** * @dev MUST emit when an approval is updated */ event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved); /** * @dev MUST emit when the URI is updated for a token ID * URIs are defined in RFC 3986 * The URI MUST point a JSON file that conforms to the "ERC-1155 Metadata JSON Schema" */ event URI(string _amount, uint256 indexed _id); /** * @notice Transfers amount of an _id from the _from address to the _to address specified * @dev MUST emit TransferSingle event on success * Caller must be approved to manage the _from account's tokens (see isApprovedForAll) * MUST throw if `_to` is the zero address * MUST throw if balance of sender for token `_id` is lower than the `_amount` sent * MUST throw on any other error * When transfer is complete, this function MUST check if `_to` is a smart contract (code size > 0). If so, it MUST call `onERC1155Received` on `_to` and revert if the return amount is not `bytes4(keccak256("onERC1155Received(address,address,uint256,uint256,bytes)"))` * @param _from Source address * @param _to Target address * @param _id ID of the token type * @param _amount Transfered amount * @param _data Additional data with no specified format, sent in call to `_to` */ function safeTransferFrom(address _from, address _to, uint256 _id, uint256 _amount, bytes calldata _data) external; /** * @notice Send multiple types of Tokens from the _from address to the _to address (with safety call) * @dev MUST emit TransferBatch event on success * Caller must be approved to manage the _from account's tokens (see isApprovedForAll) * MUST throw if `_to` is the zero address * MUST throw if length of `_ids` is not the same as length of `_amounts` * MUST throw if any of the balance of sender for token `_ids` is lower than the respective `_amounts` sent * MUST throw on any other error * When transfer is complete, this function MUST check if `_to` is a smart contract (code size > 0). If so, it MUST call `onERC1155BatchReceived` on `_to` and revert if the return amount is not `bytes4(keccak256("onERC1155BatchReceived(address,address,uint256[],uint256[],bytes)"))` * Transfers and events MUST occur in the array order they were submitted (_ids[0] before _ids[1], etc) * @param _from Source addresses * @param _to Target addresses * @param _ids IDs of each token type * @param _amounts Transfer amounts per token type * @param _data Additional data with no specified format, sent in call to `_to` */ function safeBatchTransferFrom(address _from, address _to, uint256[] calldata _ids, uint256[] calldata _amounts, bytes calldata _data) external; /** * @notice Get the balance of an account's Tokens * @param _owner The address of the token holder * @param _id ID of the Token * @return The _owner's balance of the Token type requested */ function balanceOf(address _owner, uint256 _id) external view returns (uint256); /** * @notice Get the balance of multiple account/token pairs * @param _owners The addresses of the token holders * @param _ids ID of the Tokens * @return The _owner's balance of the Token types requested (i.e. balance for each (owner, id) pair) */ function balanceOfBatch(address[] calldata _owners, uint256[] calldata _ids) external view returns (uint256[] memory); /** * @notice Enable or disable approval for a third party ("operator") to manage all of caller's tokens * @dev MUST emit the ApprovalForAll event on success * @param _operator Address to add to the set of authorized operators * @param _approved True if the operator is approved, false to revoke approval */ function setApprovalForAll(address _operator, bool _approved) external; /** * @notice Queries the approval status of an operator for a given owner * @param _owner The owner of the Tokens * @param _operator Address of authorized operator * @return True if the operator is approved, false if not */ function isApprovedForAll(address _owner, address _operator) external view returns (bool isOperator); } library Address { /** * @dev Returns true if `account` is a contract. * * [IMPORTANT] * ==== * It is unsafe to assume that an address for which this function returns * false is an externally-owned account (EOA) and not a contract. * * Among others, `isContract` will return false for the following * types of addresses: * * - an externally-owned account * - a contract in construction * - an address where a contract will be created * - an address where a contract lived, but was destroyed * ==== */ function isContract(address account) internal view returns (bool) { // This method relies on extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. uint256 size; // solhint-disable-next-line no-inline-assembly assembly { size := extcodesize(account) } return size > 0; } /** * @dev Replacement for Solidity's `transfer`: sends `amount` wei to * `recipient`, forwarding all available gas and reverting on errors. * * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost * of certain opcodes, possibly making contracts go over the 2300 gas limit * imposed by `transfer`, making them unable to receive funds via * `transfer`. {sendValue} removes this limitation. * * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more]. * * IMPORTANT: because control is transferred to `recipient`, care must be * taken to not create reentrancy vulnerabilities. Consider using * {ReentrancyGuard} or the * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern]. */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-low-level-calls, avoid-call-value (bool success, ) = recipient.call.value(amount)(""); require(success, "Address: unable to send value, recipient may have reverted"); } /** * @dev Performs a Solidity function call using a low level `call`. A * plain`call` is an unsafe replacement for a function call: use this * function instead. * * If `target` reverts with a revert reason, it is bubbled up by this * function (like regular Solidity function calls). * * Returns the raw returned data. To convert to the expected return value, * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`]. * * Requirements: * * - `target` must be a contract. * - calling `target` with `data` must not revert. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data) internal returns (bytes memory) { return functionCall(target, data, "Address: low-level call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with * `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { return functionCallWithValue(target, data, 0, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but also transferring `value` wei to `target`. * * Requirements: * * - the calling contract must have an ETH balance of at least `value`. * - the called Solidity function must be `payable`. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) { return functionCallWithValue(target, data, value, "Address: low-level call with value failed"); } /** * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but * with `errorMessage` as a fallback revert reason when `target` reverts. * * _Available since v3.1._ */ function functionCallWithValue(address target, bytes memory data, uint256 value, string memory errorMessage) internal returns (bytes memory) { require(address(this).balance >= value, "Address: insufficient balance for call"); require(isContract(target), "Address: call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.call.value(value)(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) { return functionStaticCall(target, data, "Address: low-level static call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a static call. * * _Available since v3.3._ */ function functionStaticCall(address target, bytes memory data, string memory errorMessage) internal view returns (bytes memory) { require(isContract(target), "Address: static call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.staticcall(data); return _verifyCallResult(success, returndata, errorMessage); } /** * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], * but performing a delegate call. * * _Available since v3.3._ */ function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) { return functionDelegateCall(target, data, "Address: low-level delegate call failed"); } /** * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`], * but performing a delegate call. * * _Available since v3.3._ */ function functionDelegateCall(address target, bytes memory data, string memory errorMessage) internal returns (bytes memory) { require(isContract(target), "Address: delegate call to non-contract"); // solhint-disable-next-line avoid-low-level-calls (bool success, bytes memory returndata) = target.delegatecall(data); return _verifyCallResult(success, returndata, errorMessage); } function _verifyCallResult(bool success, bytes memory returndata, string memory errorMessage) private pure returns(bytes memory) { if (success) { return returndata; } else { // Look for revert reason and bubble it up if present if (returndata.length > 0) { // The easiest way to bubble the revert reason is using memory via assembly // solhint-disable-next-line no-inline-assembly assembly { let returndata_size := mload(returndata) revert(add(32, returndata), returndata_size) } } else { revert(errorMessage); } } } } /** * @dev Implementation of Multi-Token Standard contract */ contract ERC1155 is IERC165 { using SafeMath for uint256; using Address for address; /***********************************| | Variables and Events | |__________________________________*/ // onReceive function signatures bytes4 constant internal ERC1155_RECEIVED_VALUE = 0xf23a6e61; bytes4 constant internal ERC1155_BATCH_RECEIVED_VALUE = 0xbc197c81; // Objects balances mapping (address => mapping(uint256 => uint256)) internal balances; // Operator Functions mapping (address => mapping(address => bool)) internal operators; // Events event TransferSingle(address indexed _operator, address indexed _from, address indexed _to, uint256 _id, uint256 _amount); event TransferBatch(address indexed _operator, address indexed _from, address indexed _to, uint256[] _ids, uint256[] _amounts); event ApprovalForAll(address indexed _owner, address indexed _operator, bool _approved); event URI(string _uri, uint256 indexed _id); /***********************************| | Public Transfer Functions | |__________________________________*/ /** * @notice Transfers amount amount of an _id from the _from address to the _to address specified * @param _from Source address * @param _to Target address * @param _id ID of the token type * @param _amount Transfered amount * @param _data Additional data with no specified format, sent in call to `_to` */ function safeTransferFrom(address _from, address _to, uint256 _id, uint256 _amount, bytes memory _data) public { require((msg.sender == _from) || isApprovedForAll(_from, msg.sender), "ERC1155#safeTransferFrom: INVALID_OPERATOR"); require(_to != address(0),"ERC1155#safeTransferFrom: INVALID_RECIPIENT"); // require(_amount >= balances[_from][_id]) is not necessary since checked with safemath operations _safeTransferFrom(_from, _to, _id, _amount); _callonERC1155Received(_from, _to, _id, _amount, _data); } /** * @notice Send multiple types of Tokens from the _from address to the _to address (with safety call) * @param _from Source addresses * @param _to Target addresses * @param _ids IDs of each token type * @param _amounts Transfer amounts per token type * @param _data Additional data with no specified format, sent in call to `_to` */ function safeBatchTransferFrom(address _from, address _to, uint256[] memory _ids, uint256[] memory _amounts, bytes memory _data) public { // Requirements require((msg.sender == _from) || isApprovedForAll(_from, msg.sender), "ERC1155#safeBatchTransferFrom: INVALID_OPERATOR"); require(_to != address(0), "ERC1155#safeBatchTransferFrom: INVALID_RECIPIENT"); _safeBatchTransferFrom(_from, _to, _ids, _amounts); _callonERC1155BatchReceived(_from, _to, _ids, _amounts, _data); } /***********************************| | Internal Transfer Functions | |__________________________________*/ /** * @notice Transfers amount amount of an _id from the _from address to the _to address specified * @param _from Source address * @param _to Target address * @param _id ID of the token type * @param _amount Transfered amount */ function _safeTransferFrom(address _from, address _to, uint256 _id, uint256 _amount) internal { // Update balances balances[_from][_id] = balances[_from][_id].sub(_amount); // Subtract amount balances[_to][_id] = balances[_to][_id].add(_amount); // Add amount // Emit event emit TransferSingle(msg.sender, _from, _to, _id, _amount); } /** * @notice Verifies if receiver is contract and if so, calls (_to).onERC1155Received(...) */ function _callonERC1155Received(address _from, address _to, uint256 _id, uint256 _amount, bytes memory _data) internal { // Check if recipient is contract if (_to.isContract()) { bytes4 retval = IERC1155TokenReceiver(_to).onERC1155Received(msg.sender, _from, _id, _amount, _data); require(retval == ERC1155_RECEIVED_VALUE, "ERC1155#_callonERC1155Received: INVALID_ON_RECEIVE_MESSAGE"); } } /** * @notice Send multiple types of Tokens from the _from address to the _to address (with safety call) * @param _from Source addresses * @param _to Target addresses * @param _ids IDs of each token type * @param _amounts Transfer amounts per token type */ function _safeBatchTransferFrom(address _from, address _to, uint256[] memory _ids, uint256[] memory _amounts) internal { require(_ids.length == _amounts.length, "ERC1155#_safeBatchTransferFrom: INVALID_ARRAYS_LENGTH"); // Number of transfer to execute uint256 nTransfer = _ids.length; // Executing all transfers for (uint256 i = 0; i < nTransfer; i++) { // Update storage balance of previous bin balances[_from][_ids[i]] = balances[_from][_ids[i]].sub(_amounts[i]); balances[_to][_ids[i]] = balances[_to][_ids[i]].add(_amounts[i]); } // Emit event emit TransferBatch(msg.sender, _from, _to, _ids, _amounts); } /** * @notice Verifies if receiver is contract and if so, calls (_to).onERC1155BatchReceived(...) */ function _callonERC1155BatchReceived(address _from, address _to, uint256[] memory _ids, uint256[] memory _amounts, bytes memory _data) internal { // Pass data if recipient is contract if (_to.isContract()) { bytes4 retval = IERC1155TokenReceiver(_to).onERC1155BatchReceived(msg.sender, _from, _ids, _amounts, _data); require(retval == ERC1155_BATCH_RECEIVED_VALUE, "ERC1155#_callonERC1155BatchReceived: INVALID_ON_RECEIVE_MESSAGE"); } } /***********************************| | Operator Functions | |__________________________________*/ /** * @notice Enable or disable approval for a third party ("operator") to manage all of caller's tokens * @param _operator Address to add to the set of authorized operators * @param _approved True if the operator is approved, false to revoke approval */ function setApprovalForAll(address _operator, bool _approved) external { // Update operator status operators[msg.sender][_operator] = _approved; emit ApprovalForAll(msg.sender, _operator, _approved); } /** * @notice Queries the approval status of an operator for a given owner * @param _owner The owner of the Tokens * @param _operator Address of authorized operator * @return True if the operator is approved, false if not */ function isApprovedForAll(address _owner, address _operator) public view returns (bool isOperator) { return operators[_owner][_operator]; } /***********************************| | Balance Functions | |__________________________________*/ /** * @notice Get the balance of an account's Tokens * @param _owner The address of the token holder * @param _id ID of the Token * @return The _owner's balance of the Token type requested */ function balanceOf(address _owner, uint256 _id) public view returns (uint256) { return balances[_owner][_id]; } /** * @notice Get the balance of multiple account/token pairs * @param _owners The addresses of the token holders * @param _ids ID of the Tokens * @return The _owner's balance of the Token types requested (i.e. balance for each (owner, id) pair) */ function balanceOfBatch(address[] memory _owners, uint256[] memory _ids) public view returns (uint256[] memory) { require(_owners.length == _ids.length, "ERC1155#balanceOfBatch: INVALID_ARRAY_LENGTH"); // Variables uint256[] memory batchBalances = new uint256[](_owners.length); // Iterate over each owner and token ID for (uint256 i = 0; i < _owners.length; i++) { batchBalances[i] = balances[_owners[i]][_ids[i]]; } return batchBalances; } /***********************************| | ERC165 Functions | |__________________________________*/ /** * INTERFACE_SIGNATURE_ERC165 = bytes4(keccak256("supportsInterface(bytes4)")); */ bytes4 constant private INTERFACE_SIGNATURE_ERC165 = 0x01ffc9a7; /** * INTERFACE_SIGNATURE_ERC1155 = * bytes4(keccak256("safeTransferFrom(address,address,uint256,uint256,bytes)")) ^ * bytes4(keccak256("safeBatchTransferFrom(address,address,uint256[],uint256[],bytes)")) ^ * bytes4(keccak256("balanceOf(address,uint256)")) ^ * bytes4(keccak256("balanceOfBatch(address[],uint256[])")) ^ * bytes4(keccak256("setApprovalForAll(address,bool)")) ^ * bytes4(keccak256("isApprovedForAll(address,address)")); */ bytes4 constant private INTERFACE_SIGNATURE_ERC1155 = 0xd9b67a26; /** * @notice Query if a contract implements an interface * @param _interfaceID The interface identifier, as specified in ERC-165 * @return `true` if the contract implements `_interfaceID` and */ function supportsInterface(bytes4 _interfaceID) external view returns (bool) { if (_interfaceID == INTERFACE_SIGNATURE_ERC165 || _interfaceID == INTERFACE_SIGNATURE_ERC1155) { return true; } return false; } } /** * @notice Contract that handles metadata related methods. * @dev Methods assume a deterministic generation of URI based on token IDs. * Methods also assume that URI uses hex representation of token IDs. */ contract ERC1155Metadata { // URI's default URI prefix string internal baseMetadataURI; event URI(string _uri, uint256 indexed _id); /***********************************| | Metadata Public Function s | |__________________________________*/ /** * @notice A distinct Uniform Resource Identifier (URI) for a given token. * @dev URIs are defined in RFC 3986. * URIs are assumed to be deterministically generated based on token ID * Token IDs are assumed to be represented in their hex format in URIs * @return URI string */ function uri(uint256 _id) public view returns (string memory) { return string(abi.encodePacked(baseMetadataURI, _uint2str(_id), ".json")); } /***********************************| | Metadata Internal Functions | |__________________________________*/ /** * @notice Will emit default URI log event for corresponding token _id * @param _tokenIDs Array of IDs of tokens to log default URI */ function _logURIs(uint256[] memory _tokenIDs) internal { string memory baseURL = baseMetadataURI; string memory tokenURI; for (uint256 i = 0; i < _tokenIDs.length; i++) { tokenURI = string(abi.encodePacked(baseURL, _uint2str(_tokenIDs[i]), ".json")); emit URI(tokenURI, _tokenIDs[i]); } } /** * @notice Will emit a specific URI log event for corresponding token * @param _tokenIDs IDs of the token corresponding to the _uris logged * @param _URIs The URIs of the specified _tokenIDs */ function _logURIs(uint256[] memory _tokenIDs, string[] memory _URIs) internal { require(_tokenIDs.length == _URIs.length, "ERC1155Metadata#_logURIs: INVALID_ARRAYS_LENGTH"); for (uint256 i = 0; i < _tokenIDs.length; i++) { emit URI(_URIs[i], _tokenIDs[i]); } } /** * @notice Will update the base URL of token's URI * @param _newBaseMetadataURI New base URL of token's URI */ function _setBaseMetadataURI(string memory _newBaseMetadataURI) internal { baseMetadataURI = _newBaseMetadataURI; } /***********************************| | Utility Internal Functions | |__________________________________*/ /** * @notice Convert uint256 to string * @param _i Unsigned integer to convert to string */ function _uint2str(uint256 _i) internal pure returns (string memory _uintAsString) { if (_i == 0) { return "0"; } uint256 j = _i; uint256 ii = _i; uint256 len; // Get number of bytes while (j != 0) { len++; j /= 10; } bytes memory bstr = new bytes(len); uint256 k = len - 1; // Get each individual ASCII while (ii != 0) { bstr[k--] = byte(uint8(48 + ii % 10)); ii /= 10; } // Convert to string return string(bstr); } } /** * @dev Multi-Fungible Tokens with minting and burning methods. These methods assume * a parent contract to be executed as they are `internal` functions */ contract ERC1155MintBurn is ERC1155 { /****************************************| | Minting Functions | |_______________________________________*/ /** * @notice Mint _amount of tokens of a given id * @param _to The address to mint tokens to * @param _id Token id to mint * @param _amount The amount to be minted * @param _data Data to pass if receiver is contract */ function _mint(address _to, uint256 _id, uint256 _amount, bytes memory _data) internal { // Add _amount balances[_to][_id] = balances[_to][_id].add(_amount); // Emit event emit TransferSingle(msg.sender, address(0x0), _to, _id, _amount); // Calling onReceive method if recipient is contract _callonERC1155Received(address(0x0), _to, _id, _amount, _data); } /** * @notice Mint tokens for each ids in _ids * @param _to The address to mint tokens to * @param _ids Array of ids to mint * @param _amounts Array of amount of tokens to mint per id * @param _data Data to pass if receiver is contract */ function _batchMint(address _to, uint256[] memory _ids, uint256[] memory _amounts, bytes memory _data) internal { require(_ids.length == _amounts.length, "ERC1155MintBurn#batchMint: INVALID_ARRAYS_LENGTH"); // Number of mints to execute uint256 nMint = _ids.length; // Executing all minting for (uint256 i = 0; i < nMint; i++) { // Update storage balance balances[_to][_ids[i]] = balances[_to][_ids[i]].add(_amounts[i]); } // Emit batch mint event emit TransferBatch(msg.sender, address(0x0), _to, _ids, _amounts); // Calling onReceive method if recipient is contract _callonERC1155BatchReceived(address(0x0), _to, _ids, _amounts, _data); } /****************************************| | Burning Functions | |_______________________________________*/ /** * @notice Burn _amount of tokens of a given token id * @param _from The address to burn tokens from * @param _id Token id to burn * @param _amount The amount to be burned */ function _burn(address _from, uint256 _id, uint256 _amount) internal { //Substract _amount balances[_from][_id] = balances[_from][_id].sub(_amount); // Emit event emit TransferSingle(msg.sender, _from, address(0x0), _id, _amount); } /** * @notice Burn tokens of given token id for each (_ids[i], _amounts[i]) pair * @param _from The address to burn tokens from * @param _ids Array of token ids to burn * @param _amounts Array of the amount to be burned */ function _batchBurn(address _from, uint256[] memory _ids, uint256[] memory _amounts) internal { require(_ids.length == _amounts.length, "ERC1155MintBurn#batchBurn: INVALID_ARRAYS_LENGTH"); // Number of mints to execute uint256 nBurn = _ids.length; // Executing all minting for (uint256 i = 0; i < nBurn; i++) { // Update storage balance balances[_from][_ids[i]] = balances[_from][_ids[i]].sub(_amounts[i]); } // Emit batch mint event emit TransferBatch(msg.sender, _from, address(0x0), _ids, _amounts); } } library Strings { // via https://github.com/oraclize/ethereum-api/blob/master/oraclizeAPI_0.5.sol function strConcat( string memory _a, string memory _b, string memory _c, string memory _d, string memory _e ) internal pure returns (string memory) { bytes memory _ba = bytes(_a); bytes memory _bb = bytes(_b); bytes memory _bc = bytes(_c); bytes memory _bd = bytes(_d); bytes memory _be = bytes(_e); string memory abcde = new string(_ba.length + _bb.length + _bc.length + _bd.length + _be.length); bytes memory babcde = bytes(abcde); uint256 k = 0; for (uint256 i = 0; i < _ba.length; i++) babcde[k++] = _ba[i]; for (uint256 i = 0; i < _bb.length; i++) babcde[k++] = _bb[i]; for (uint256 i = 0; i < _bc.length; i++) babcde[k++] = _bc[i]; for (uint256 i = 0; i < _bd.length; i++) babcde[k++] = _bd[i]; for (uint256 i = 0; i < _be.length; i++) babcde[k++] = _be[i]; return string(babcde); } function strConcat( string memory _a, string memory _b, string memory _c, string memory _d ) internal pure returns (string memory) { return strConcat(_a, _b, _c, _d, ""); } function strConcat( string memory _a, string memory _b, string memory _c ) internal pure returns (string memory) { return strConcat(_a, _b, _c, "", ""); } function strConcat(string memory _a, string memory _b) internal pure returns (string memory) { return strConcat(_a, _b, "", "", ""); } function uint2str(uint256 _i) internal pure returns (string memory _uintAsString) { if (_i == 0) { return "0"; } uint256 j = _i; uint256 len; while (j != 0) { len++; j /= 10; } bytes memory bstr = new bytes(len); uint256 k = len - 1; while (_i != 0) { bstr[k--] = bytes1(uint8(48 + (_i % 10))); _i /= 10; } return string(bstr); } } contract OwnableDelegateProxy {} contract ProxyRegistry { mapping(address => OwnableDelegateProxy) public proxies; } /** * @title ERC1155Tradable * ERC1155Tradable - ERC1155 contract that whitelists an operator address, * has create and mint functionality, and supports useful standards from OpenZeppelin, like _exists(), name(), symbol(), and totalSupply() */ contract ERC1155Tradable is ERC1155, ERC1155MintBurn, ERC1155Metadata, Ownable, MinterRole, WhitelistAdminRole { using Strings for string; address proxyRegistryAddress; uint256 private _currentTokenID = 0; mapping(uint256 => address) public creators; mapping(uint256 => uint256) public tokenSupply; mapping(uint256 => uint256) public tokenMaxSupply; // Contract name string public name; // Contract symbol string public symbol; mapping(uint256 => string) private uris; bool private constructed = false; function init( string memory _name, string memory _symbol, address _proxyRegistryAddress ) public { require(!constructed, "ERC155 Tradeable must not be constructed yet"); constructed = true; name = _name; symbol = _symbol; proxyRegistryAddress = _proxyRegistryAddress; super.initOwnable(); super.initMinter(); super.initWhiteListAdmin(); } constructor( string memory _name, string memory _symbol, address _proxyRegistryAddress ) public { constructed = true; name = _name; symbol = _symbol; proxyRegistryAddress = _proxyRegistryAddress; } function removeWhitelistAdmin(address account) public onlyOwner { _removeWhitelistAdmin(account); } function removeMinter(address account) public onlyOwner { _removeMinter(account); } function uri(uint256 _id) public view returns (string memory) { require(_exists(_id), "ERC721Tradable#uri: NONEXISTENT_TOKEN"); //return super.uri(_id); if(bytes(uris[_id]).length > 0){ return uris[_id]; } return Strings.strConcat(baseMetadataURI, Strings.uint2str(_id)); } /** * @dev Returns the total quantity for a token ID * @param _id uint256 ID of the token to query * @return amount of token in existence */ function totalSupply(uint256 _id) public view returns (uint256) { return tokenSupply[_id]; } /** * @dev Returns the max quantity for a token ID * @param _id uint256 ID of the token to query * @return amount of token in existence */ function maxSupply(uint256 _id) public view returns (uint256) { return tokenMaxSupply[_id]; } /** * @dev Will update the base URL of token's URI * @param _newBaseMetadataURI New base URL of token's URI */ function setBaseMetadataURI(string memory _newBaseMetadataURI) public onlyWhitelistAdmin { _setBaseMetadataURI(_newBaseMetadataURI); } /** * @dev Creates a new token type and assigns _initialSupply to an address * @param _maxSupply max supply allowed * @param _initialSupply Optional amount to supply the first owner * @param _uri Optional URI for this token type * @param _data Optional data to pass if receiver is contract * @return The newly created token ID */ function create( uint256 _maxSupply, uint256 _initialSupply, string calldata _uri, bytes calldata _data ) external onlyWhitelistAdmin returns (uint256 tokenId) { require(_initialSupply <= _maxSupply, "Initial supply cannot be more than max supply"); uint256 _id = _getNextTokenID(); _incrementTokenTypeId(); creators[_id] = msg.sender; if (bytes(_uri).length > 0) { uris[_id] = _uri; emit URI(_uri, _id); } else{ emit URI(string(abi.encodePacked(baseMetadataURI, _uint2str(_id), ".json")), _id); } if (_initialSupply != 0) _mint(msg.sender, _id, _initialSupply, _data); tokenSupply[_id] = _initialSupply; tokenMaxSupply[_id] = _maxSupply; return _id; } function updateUri(uint256 _id, string calldata _uri) external onlyWhitelistAdmin{ if (bytes(_uri).length > 0) { uris[_id] = _uri; emit URI(_uri, _id); } else{ emit URI(string(abi.encodePacked(baseMetadataURI, _uint2str(_id), ".json")), _id); } } function burn(address _address, uint256 _id, uint256 _amount) external { require((msg.sender == _address) || isApprovedForAll(_address, msg.sender), "ERC1155#burn: INVALID_OPERATOR"); require(balances[_address][_id] >= _amount, "Trying to burn more tokens than you own"); _burn(_address, _id, _amount); } function updateProxyRegistryAddress(address _proxyRegistryAddress) external onlyWhitelistAdmin{ require(_proxyRegistryAddress != address(0), "No zero address"); proxyRegistryAddress = _proxyRegistryAddress; } /** * @dev Mints some amount of tokens to an address * @param _id Token ID to mint * @param _quantity Amount of tokens to mint * @param _data Data to pass if receiver is contract */ function mint( uint256 _id, uint256 _quantity, bytes memory _data ) public onlyMinter { uint256 tokenId = _id; require(tokenSupply[tokenId].add(_quantity) <= tokenMaxSupply[tokenId], "Max supply reached"); _mint(msg.sender, _id, _quantity, _data); tokenSupply[_id] = tokenSupply[_id].add(_quantity); } /** * Override isApprovedForAll to whitelist user's OpenSea proxy accounts to enable gas-free listings. */ function isApprovedForAll(address _owner, address _operator) public view returns (bool isOperator) { // Whitelist OpenSea proxy contract for easy trading. ProxyRegistry proxyRegistry = ProxyRegistry(proxyRegistryAddress); if (address(proxyRegistry.proxies(_owner)) == _operator) { return true; } return ERC1155.isApprovedForAll(_owner, _operator); } /** * @dev Returns whether the specified token exists by checking to see if it has a creator * @param _id uint256 ID of the token to query the existence of * @return bool whether the token exists */ function _exists(uint256 _id) internal view returns (bool) { return creators[_id] != address(0); } /** * @dev calculates the next token ID based on value of _currentTokenID * @return uint256 for the next token ID */ function _getNextTokenID() private view returns (uint256) { return _currentTokenID.add(1); } /** * @dev increments the value of _currentTokenID */ function _incrementTokenTypeId() private { _currentTokenID++; } } /** * @title Unifty * Unifty - NFT Tools * * Rinkeby Opensea: 0xf57b2c51ded3a29e6891aba85459d600256cf317 * Mainnet Opensea: 0xa5409ec958c83c3f309868babaca7c86dcb077c1 */ contract Unifty is ERC1155Tradable { string private _contractURI = "https://unifty.io/meta/contract.json"; constructor(address _proxyRegistryAddress) public ERC1155Tradable("Unifty", "UNIF", _proxyRegistryAddress) { _setBaseMetadataURI("https://unifty.io/meta/"); } function contractURI() public view returns (string memory) { return _contractURI; } function setContractURI(string memory _uri) public onlyWhitelistAdmin{ _contractURI = _uri; } function version() external pure returns (uint256) { return 1; } }
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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.