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Contract Name:
DawnTokenImpl
Compiler Version
v0.5.16+commit.9c3226ce
Optimization Enabled:
Yes with 1500 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity)
/** *Submitted for verification at Etherscan.io on 2020-04-30 */ // File: @openzeppelin/upgrades/contracts/Initializable.sol pragma solidity >=0.4.24 <0.7.0; /** * @title Initializable * * @dev Helper contract to support initializer functions. To use it, replace * the constructor with a function that has the `initializer` modifier. * WARNING: Unlike constructors, initializer functions must be manually * invoked. This applies both to deploying an Initializable contract, as well * as extending an Initializable contract via inheritance. * WARNING: When used with inheritance, manual care must be taken to not invoke * a parent initializer twice, or ensure that all initializers are idempotent, * because this is not dealt with automatically as with constructors. */ contract Initializable { /** * @dev Indicates that the contract has been initialized. */ bool private initialized; /** * @dev Indicates that the contract is in the process of being initialized. */ bool private initializing; /** * @dev Modifier to use in the initializer function of a contract. */ modifier initializer() { require(initializing || isConstructor() || !initialized, "Contract instance has already been initialized"); bool isTopLevelCall = !initializing; if (isTopLevelCall) { initializing = true; initialized = true; } _; if (isTopLevelCall) { initializing = false; } } /// @dev Returns true if and only if the function is running in the constructor function isConstructor() private view returns (bool) { // extcodesize checks the size of the code stored in an address, and // address returns the current address. Since the code is still not // deployed when running a constructor, any checks on its code size will // yield zero, making it an effective way to detect if a contract is // under construction or not. address self = address(this); uint256 cs; assembly { cs := extcodesize(self) } return cs == 0; } // Reserved storage space to allow for layout changes in the future. uint256[50] private ______gap; } // File: @openzeppelin/contracts-ethereum-package/contracts/GSN/Context.sol pragma solidity ^0.5.0; /* * @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 is Initializable { // 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; } } // File: @openzeppelin/contracts-ethereum-package/contracts/token/ERC777/IERC777.sol pragma solidity ^0.5.0; /** * @dev Interface of the ERC777Token standard as defined in the EIP. * * This contract uses the * https://eips.ethereum.org/EIPS/eip-1820[ERC1820 registry standard] to let * token holders and recipients react to token movements by using setting implementers * for the associated interfaces in said registry. See {IERC1820Registry} and * {ERC1820Implementer}. */ interface IERC777 { /** * @dev Returns the name of the token. */ function name() external view returns (string memory); /** * @dev Returns the symbol of the token, usually a shorter version of the * name. */ function symbol() external view returns (string memory); /** * @dev Returns the smallest part of the token that is not divisible. This * means all token operations (creation, movement and destruction) must have * amounts that are a multiple of this number. * * For most token contracts, this value will equal 1. */ function granularity() external view returns (uint256); /** * @dev Returns the amount of tokens in existence. */ function totalSupply() external view returns (uint256); /** * @dev Returns the amount of tokens owned by an account (`owner`). */ function balanceOf(address owner) external view returns (uint256); /** * @dev Moves `amount` tokens from the caller's account to `recipient`. * * If send or receive hooks are registered for the caller and `recipient`, * the corresponding functions will be called with `data` and empty * `operatorData`. See {IERC777Sender} and {IERC777Recipient}. * * Emits a {Sent} event. * * Requirements * * - the caller must have at least `amount` tokens. * - `recipient` cannot be the zero address. * - if `recipient` is a contract, it must implement the {IERC777Recipient} * interface. */ function send(address recipient, uint256 amount, bytes calldata data) external; /** * @dev Destroys `amount` tokens from the caller's account, reducing the * total supply. * * If a send hook is registered for the caller, the corresponding function * will be called with `data` and empty `operatorData`. See {IERC777Sender}. * * Emits a {Burned} event. * * Requirements * * - the caller must have at least `amount` tokens. */ function burn(uint256 amount, bytes calldata data) external; /** * @dev Returns true if an account is an operator of `tokenHolder`. * Operators can send and burn tokens on behalf of their owners. All * accounts are their own operator. * * See {operatorSend} and {operatorBurn}. */ function isOperatorFor(address operator, address tokenHolder) external view returns (bool); /** * @dev Make an account an operator of the caller. * * See {isOperatorFor}. * * Emits an {AuthorizedOperator} event. * * Requirements * * - `operator` cannot be calling address. */ function authorizeOperator(address operator) external; /** * @dev Make an account an operator of the caller. * * See {isOperatorFor} and {defaultOperators}. * * Emits a {RevokedOperator} event. * * Requirements * * - `operator` cannot be calling address. */ function revokeOperator(address operator) external; /** * @dev Returns the list of default operators. These accounts are operators * for all token holders, even if {authorizeOperator} was never called on * them. * * This list is immutable, but individual holders may revoke these via * {revokeOperator}, in which case {isOperatorFor} will return false. */ function defaultOperators() external view returns (address[] memory); /** * @dev Moves `amount` tokens from `sender` to `recipient`. The caller must * be an operator of `sender`. * * If send or receive hooks are registered for `sender` and `recipient`, * the corresponding functions will be called with `data` and * `operatorData`. See {IERC777Sender} and {IERC777Recipient}. * * Emits a {Sent} event. * * Requirements * * - `sender` cannot be the zero address. * - `sender` must have at least `amount` tokens. * - the caller must be an operator for `sender`. * - `recipient` cannot be the zero address. * - if `recipient` is a contract, it must implement the {IERC777Recipient} * interface. */ function operatorSend( address sender, address recipient, uint256 amount, bytes calldata data, bytes calldata operatorData ) external; /** * @dev Destoys `amount` tokens from `account`, reducing the total supply. * The caller must be an operator of `account`. * * If a send hook is registered for `account`, the corresponding function * will be called with `data` and `operatorData`. See {IERC777Sender}. * * Emits a {Burned} event. * * Requirements * * - `account` cannot be the zero address. * - `account` must have at least `amount` tokens. * - the caller must be an operator for `account`. */ function operatorBurn( address account, uint256 amount, bytes calldata data, bytes calldata operatorData ) external; event Sent( address indexed operator, address indexed from, address indexed to, uint256 amount, bytes data, bytes operatorData ); event Minted(address indexed operator, address indexed to, uint256 amount, bytes data, bytes operatorData); event Burned(address indexed operator, address indexed from, uint256 amount, bytes data, bytes operatorData); event AuthorizedOperator(address indexed operator, address indexed tokenHolder); event RevokedOperator(address indexed operator, address indexed tokenHolder); } // File: @openzeppelin/contracts-ethereum-package/contracts/token/ERC777/IERC777Recipient.sol pragma solidity ^0.5.0; /** * @dev Interface of the ERC777TokensRecipient standard as defined in the EIP. * * Accounts can be notified of {IERC777} tokens being sent to them by having a * contract implement this interface (contract holders can be their own * implementer) and registering it on the * https://eips.ethereum.org/EIPS/eip-1820[ERC1820 global registry]. * * See {IERC1820Registry} and {ERC1820Implementer}. */ interface IERC777Recipient { /** * @dev Called by an {IERC777} token contract whenever tokens are being * moved or created into a registered account (`to`). The type of operation * is conveyed by `from` being the zero address or not. * * This call occurs _after_ the token contract's state is updated, so * {IERC777-balanceOf}, etc., can be used to query the post-operation state. * * This function may revert to prevent the operation from being executed. */ function tokensReceived( address operator, address from, address to, uint256 amount, bytes calldata userData, bytes calldata operatorData ) external; } // File: @openzeppelin/contracts-ethereum-package/contracts/token/ERC777/IERC777Sender.sol pragma solidity ^0.5.0; /** * @dev Interface of the ERC777TokensSender standard as defined in the EIP. * * {IERC777} Token holders can be notified of operations performed on their * tokens by having a contract implement this interface (contract holders can be * their own implementer) and registering it on the * https://eips.ethereum.org/EIPS/eip-1820[ERC1820 global registry]. * * See {IERC1820Registry} and {ERC1820Implementer}. */ interface IERC777Sender { /** * @dev Called by an {IERC777} token contract whenever a registered holder's * (`from`) tokens are about to be moved or destroyed. The type of operation * is conveyed by `to` being the zero address or not. * * This call occurs _before_ the token contract's state is updated, so * {IERC777-balanceOf}, etc., can be used to query the pre-operation state. * * This function may revert to prevent the operation from being executed. */ function tokensToSend( address operator, address from, address to, uint256 amount, bytes calldata userData, bytes calldata operatorData ) external; } // File: @openzeppelin/contracts-ethereum-package/contracts/token/ERC20/IERC20.sol pragma solidity ^0.5.0; /** * @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); } // File: @openzeppelin/contracts-ethereum-package/contracts/math/SafeMath.sol pragma solidity ^0.5.0; /** * @dev Wrappers over Solidity's arithmetic operations with added overflow * checks. * * Arithmetic operations in Solidity wrap on overflow. This can easily result * in bugs, because programmers usually assume that an overflow raises an * error, which is the standard behavior in high level programming languages. * `SafeMath` restores this intuition by reverting the transaction when an * operation overflows. * * Using this library instead of the unchecked operations eliminates an entire * class of bugs, so it's recommended to use it always. */ library SafeMath { /** * @dev Returns the addition of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `+` operator. * * Requirements: * - Addition cannot overflow. */ function add(uint256 a, uint256 b) internal pure returns (uint256) { uint256 c = a + b; require(c >= a, "SafeMath: addition overflow"); return c; } /** * @dev Returns the subtraction of two unsigned integers, reverting on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. */ function sub(uint256 a, uint256 b) internal pure returns (uint256) { return sub(a, b, "SafeMath: subtraction overflow"); } /** * @dev Returns the subtraction of two unsigned integers, reverting with custom message on * overflow (when the result is negative). * * Counterpart to Solidity's `-` operator. * * Requirements: * - Subtraction cannot overflow. * * _Available since v2.4.0._ */ function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b <= a, errorMessage); uint256 c = a - b; return c; } /** * @dev Returns the multiplication of two unsigned integers, reverting on * overflow. * * Counterpart to Solidity's `*` operator. * * Requirements: * - Multiplication cannot 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-contracts/pull/522 if (a == 0) { return 0; } uint256 c = a * b; require(c / a == b, "SafeMath: multiplication overflow"); return c; } /** * @dev Returns the integer division of two unsigned integers. Reverts on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function div(uint256 a, uint256 b) internal pure returns (uint256) { return div(a, b, "SafeMath: division by zero"); } /** * @dev Returns the integer division of two unsigned integers. Reverts with custom message on * division by zero. The result is rounded towards zero. * * Counterpart to Solidity's `/` operator. Note: this function uses a * `revert` opcode (which leaves remaining gas untouched) while Solidity * uses an invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. * * _Available since v2.4.0._ */ function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { // Solidity only automatically asserts when dividing by 0 require(b > 0, errorMessage); uint256 c = a / b; // assert(a == b * c + a % b); // There is no case in which this doesn't hold return c; } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. */ function mod(uint256 a, uint256 b) internal pure returns (uint256) { return mod(a, b, "SafeMath: modulo by zero"); } /** * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo), * Reverts with custom message when dividing by zero. * * Counterpart to Solidity's `%` operator. This function uses a `revert` * opcode (which leaves remaining gas untouched) while Solidity uses an * invalid opcode to revert (consuming all remaining gas). * * Requirements: * - The divisor cannot be zero. * * _Available since v2.4.0._ */ function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) { require(b != 0, errorMessage); return a % b; } } // File: @openzeppelin/contracts-ethereum-package/contracts/utils/Address.sol pragma solidity ^0.5.5; /** * @dev Collection of functions related to the address type */ library Address { /** * @dev Returns true if `account` is a contract. * * This test is non-exhaustive, and there may be false-negatives: during the * execution of a contract's constructor, its address will be reported as * not containing 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. */ function isContract(address account) internal view returns (bool) { // This method relies in extcodesize, which returns 0 for contracts in // construction, since the code is only stored at the end of the // constructor execution. // According to EIP-1052, 0x0 is the value returned for not-yet created accounts // and 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470 is returned // for accounts without code, i.e. `keccak256('')` bytes32 codehash; bytes32 accountHash = 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470; // solhint-disable-next-line no-inline-assembly assembly { codehash := extcodehash(account) } return (codehash != 0x0 && codehash != accountHash); } /** * @dev Converts an `address` into `address payable`. Note that this is * simply a type cast: the actual underlying value is not changed. * * _Available since v2.4.0._ */ function toPayable(address account) internal pure returns (address payable) { return address(uint160(account)); } /** * @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]. * * _Available since v2.4.0._ */ function sendValue(address payable recipient, uint256 amount) internal { require(address(this).balance >= amount, "Address: insufficient balance"); // solhint-disable-next-line avoid-call-value (bool success, ) = recipient.call.value(amount)(""); require(success, "Address: unable to send value, recipient may have reverted"); } } // File: @openzeppelin/contracts-ethereum-package/contracts/introspection/IERC1820Registry.sol pragma solidity ^0.5.0; /** * @dev Interface of the global ERC1820 Registry, as defined in the * https://eips.ethereum.org/EIPS/eip-1820[EIP]. Accounts may register * implementers for interfaces in this registry, as well as query support. * * Implementers may be shared by multiple accounts, and can also implement more * than a single interface for each account. Contracts can implement interfaces * for themselves, but externally-owned accounts (EOA) must delegate this to a * contract. * * {IERC165} interfaces can also be queried via the registry. * * For an in-depth explanation and source code analysis, see the EIP text. */ interface IERC1820Registry { /** * @dev Sets `newManager` as the manager for `account`. A manager of an * account is able to set interface implementers for it. * * By default, each account is its own manager. Passing a value of `0x0` in * `newManager` will reset the manager to this initial state. * * Emits a {ManagerChanged} event. * * Requirements: * * - the caller must be the current manager for `account`. */ function setManager(address account, address newManager) external; /** * @dev Returns the manager for `account`. * * See {setManager}. */ function getManager(address account) external view returns (address); /** * @dev Sets the `implementer` contract as `account`'s implementer for * `interfaceHash`. * * `account` being the zero address is an alias for the caller's address. * The zero address can also be used in `implementer` to remove an old one. * * See {interfaceHash} to learn how these are created. * * Emits an {InterfaceImplementerSet} event. * * Requirements: * * - the caller must be the current manager for `account`. * - `interfaceHash` must not be an {IERC165} interface id (i.e. it must not * end in 28 zeroes). * - `implementer` must implement {IERC1820Implementer} and return true when * queried for support, unless `implementer` is the caller. See * {IERC1820Implementer-canImplementInterfaceForAddress}. */ function setInterfaceImplementer(address account, bytes32 interfaceHash, address implementer) external; /** * @dev Returns the implementer of `interfaceHash` for `account`. If no such * implementer is registered, returns the zero address. * * If `interfaceHash` is an {IERC165} interface id (i.e. it ends with 28 * zeroes), `account` will be queried for support of it. * * `account` being the zero address is an alias for the caller's address. */ function getInterfaceImplementer(address account, bytes32 interfaceHash) external view returns (address); /** * @dev Returns the interface hash for an `interfaceName`, as defined in the * corresponding * https://eips.ethereum.org/EIPS/eip-1820#interface-name[section of the EIP]. */ function interfaceHash(string calldata interfaceName) external pure returns (bytes32); /** * @notice Updates the cache with whether the contract implements an ERC165 interface or not. * @param account Address of the contract for which to update the cache. * @param interfaceId ERC165 interface for which to update the cache. */ function updateERC165Cache(address account, bytes4 interfaceId) external; /** * @notice Checks whether a contract implements an ERC165 interface or not. * If the result is not cached a direct lookup on the contract address is performed. * If the result is not cached or the cached value is out-of-date, the cache MUST be updated manually by calling * {updateERC165Cache} with the contract address. * @param account Address of the contract to check. * @param interfaceId ERC165 interface to check. * @return True if `account` implements `interfaceId`, false otherwise. */ function implementsERC165Interface(address account, bytes4 interfaceId) external view returns (bool); /** * @notice Checks whether a contract implements an ERC165 interface or not without using nor updating the cache. * @param account Address of the contract to check. * @param interfaceId ERC165 interface to check. * @return True if `account` implements `interfaceId`, false otherwise. */ function implementsERC165InterfaceNoCache(address account, bytes4 interfaceId) external view returns (bool); event InterfaceImplementerSet(address indexed account, bytes32 indexed interfaceHash, address indexed implementer); event ManagerChanged(address indexed account, address indexed newManager); } // File: contracts/ERC777Overridable.sol // See comments in DawnTokenImpl.sold pragma solidity ^0.5.0; /** * @dev Implementation of the {IERC777} interface. * * This implementation is agnostic to the way tokens are created. This means * that a supply mechanism has to be added in a derived contract using {_mint}. * * Support for ERC20 is included in this contract, as specified by the EIP: both * the ERC777 and ERC20 interfaces can be safely used when interacting with it. * Both {IERC777-Sent} and {IERC20-Transfer} events are emitted on token * movements. * * Additionally, the {IERC777-granularity} value is hard-coded to `1`, meaning that there * are no special restrictions in the amount of tokens that created, moved, or * destroyed. This makes integration with ERC20 applications seamless. */ contract ERC777Overridable is Initializable, Context, IERC777, IERC20 { using SafeMath for uint256; using Address for address; IERC1820Registry constant private _erc1820 = IERC1820Registry(0x1820a4B7618BdE71Dce8cdc73aAB6C95905faD24); mapping(address => uint256) private _balances; uint256 private _totalSupply; string private _name; string private _symbol; // We inline the result of the following hashes because Solidity doesn't resolve them at compile time. // See https://github.com/ethereum/solidity/issues/4024. // keccak256("ERC777TokensSender") bytes32 constant private TOKENS_SENDER_INTERFACE_HASH = 0x29ddb589b1fb5fc7cf394961c1adf5f8c6454761adf795e67fe149f658abe895; // keccak256("ERC777TokensRecipient") bytes32 constant private TOKENS_RECIPIENT_INTERFACE_HASH = 0xb281fc8c12954d22544db45de3159a39272895b169a852b314f9cc762e44c53b; // This isn't ever read from - it's only used to respond to the defaultOperators query. address[] private _defaultOperatorsArray; // Immutable, but accounts may revoke them (tracked in __revokedDefaultOperators). mapping(address => bool) private _defaultOperators; // For each account, a mapping of its operators and revoked default operators. mapping(address => mapping(address => bool)) private _operators; mapping(address => mapping(address => bool)) private _revokedDefaultOperators; // ERC20-allowances mapping (address => mapping (address => uint256)) private _allowances; /** * @dev `defaultOperators` may be an empty array. */ function initialize( string memory name, string memory symbol, address[] memory defaultOperators ) public initializer { _name = name; _symbol = symbol; _defaultOperatorsArray = defaultOperators; for (uint256 i = 0; i < _defaultOperatorsArray.length; i++) { _defaultOperators[_defaultOperatorsArray[i]] = true; } // register interfaces _erc1820.setInterfaceImplementer(address(this), keccak256("ERC777Token"), address(this)); _erc1820.setInterfaceImplementer(address(this), keccak256("ERC20Token"), address(this)); } /** * @dev See {IERC777-name}. */ function name() public view returns (string memory) { return _name; } /** * @dev See {IERC777-symbol}. */ function symbol() public view returns (string memory) { return _symbol; } /** * @dev See {ERC20Detailed-decimals}. * * Always returns 18, as per the * [ERC777 EIP](https://eips.ethereum.org/EIPS/eip-777#backward-compatibility). */ function decimals() public pure returns (uint8) { return 18; } /** * @dev See {IERC777-granularity}. * * This implementation always returns `1`. */ function granularity() public view returns (uint256) { return 1; } /** * @dev See {IERC777-totalSupply}. */ function totalSupply() public view returns (uint256) { return _totalSupply; } /** * @dev Returns the amount of tokens owned by an account (`tokenHolder`). */ function balanceOf(address tokenHolder) public view returns (uint256) { return _balances[tokenHolder]; } /** * @dev See {IERC777-send}. * * Also emits a {Transfer} event for ERC20 compatibility. */ function sendInternal(address recipient, uint256 amount, bytes memory data) internal { _send(_msgSender(), _msgSender(), recipient, amount, data, "", true); } /** * @dev See {IERC20-transfer}. * * Unlike `send`, `recipient` is _not_ required to implement the {IERC777Recipient} * interface if it is a contract. * * Also emits a {Sent} event. */ function transferInternal(address recipient, uint256 amount) internal returns (bool) { require(recipient != address(0), "ERC777: transfer to the zero address"); address from = _msgSender(); _callTokensToSend(from, from, recipient, amount, "", ""); _move(from, from, recipient, amount, "", ""); _callTokensReceived(from, from, recipient, amount, "", "", false); return true; } /** * @dev See {IERC777-burn}. * * Also emits a {Transfer} event for ERC20 compatibility. */ function burnInternal(uint256 amount, bytes memory data) internal { _burn(_msgSender(), _msgSender(), amount, data, ""); } /** * @dev See {IERC777-isOperatorFor}. */ function isOperatorFor( address operator, address tokenHolder ) public view returns (bool) { return operator == tokenHolder || (_defaultOperators[operator] && !_revokedDefaultOperators[tokenHolder][operator]) || _operators[tokenHolder][operator]; } /** * @dev See {IERC777-authorizeOperator}. */ function authorizeOperator(address operator) external { require(_msgSender() != operator, "ERC777: authorizing self as operator"); if (_defaultOperators[operator]) { delete _revokedDefaultOperators[_msgSender()][operator]; } else { _operators[_msgSender()][operator] = true; } emit AuthorizedOperator(operator, _msgSender()); } /** * @dev See {IERC777-revokeOperator}. */ function revokeOperator(address operator) external { require(operator != _msgSender(), "ERC777: revoking self as operator"); if (_defaultOperators[operator]) { _revokedDefaultOperators[_msgSender()][operator] = true; } else { delete _operators[_msgSender()][operator]; } emit RevokedOperator(operator, _msgSender()); } /** * @dev See {IERC777-defaultOperators}. */ function defaultOperators() public view returns (address[] memory) { return _defaultOperatorsArray; } /** * @dev See {IERC777-operatorSend}. * * Emits {Sent} and {Transfer} events. */ function operatorSendInternal( address sender, address recipient, uint256 amount, bytes memory data, bytes memory operatorData ) internal { require(isOperatorFor(_msgSender(), sender), "ERC777: caller is not an operator for holder"); _send(_msgSender(), sender, recipient, amount, data, operatorData, true); } /** * @dev See {IERC777-operatorBurn}. * * Emits {Burned} and {Transfer} events. */ function operatorBurnInternal(address account, uint256 amount, bytes memory data, bytes memory operatorData) internal { require(isOperatorFor(_msgSender(), account), "ERC777: caller is not an operator for holder"); _burn(_msgSender(), account, amount, data, operatorData); } /** * @dev See {IERC20-allowance}. * * Note that operator and allowance concepts are orthogonal: operators may * not have allowance, and accounts with allowance may not be operators * themselves. */ function allowance(address holder, address spender) public view returns (uint256) { return _allowances[holder][spender]; } /** * @dev See {IERC20-approve}. * * Note that accounts cannot have allowance issued by their operators. */ function approve(address spender, uint256 value) external returns (bool) { address holder = _msgSender(); _approve(holder, spender, value); return true; } /** * @dev See {IERC20-transferFrom}. * * Note that operator and allowance concepts are orthogonal: operators cannot * call `transferFrom` (unless they have allowance), and accounts with * allowance cannot call `operatorSend` (unless they are operators). * * Emits {Sent}, {Transfer} and {Approval} events. */ function transferFromInternal(address holder, address recipient, uint256 amount) internal returns (bool) { require(recipient != address(0), "ERC777: transfer to the zero address"); require(holder != address(0), "ERC777: transfer from the zero address"); address spender = _msgSender(); _callTokensToSend(spender, holder, recipient, amount, "", ""); _move(spender, holder, recipient, amount, "", ""); _approve(holder, spender, _allowances[holder][spender].sub(amount, "ERC777: transfer amount exceeds allowance")); _callTokensReceived(spender, holder, recipient, amount, "", "", false); return true; } /** * @dev Creates `amount` tokens and assigns them to `account`, increasing * the total supply. * * If a send hook is registered for `account`, the corresponding function * will be called with `operator`, `data` and `operatorData`. * * See {IERC777Sender} and {IERC777Recipient}. * * Emits {Minted} and {Transfer} events. * * Requirements * * - `account` cannot be the zero address. * - if `account` is a contract, it must implement the {IERC777Recipient} * interface. */ function _mint( address operator, address account, uint256 amount, bytes memory userData, bytes memory operatorData ) internal { require(account != address(0), "ERC777: mint to the zero address"); // Update state variables _totalSupply = _totalSupply.add(amount); _balances[account] = _balances[account].add(amount); _callTokensReceived(operator, address(0), account, amount, userData, operatorData, true); emit Minted(operator, account, amount, userData, operatorData); emit Transfer(address(0), account, amount); } /** * @dev Send tokens * @param operator address operator requesting the transfer * @param from address token holder address * @param to address recipient address * @param amount uint256 amount of tokens to transfer * @param userData bytes extra information provided by the token holder (if any) * @param operatorData bytes extra information provided by the operator (if any) * @param requireReceptionAck if true, contract recipients are required to implement ERC777TokensRecipient */ function _send( address operator, address from, address to, uint256 amount, bytes memory userData, bytes memory operatorData, bool requireReceptionAck ) private { require(from != address(0), "ERC777: send from the zero address"); require(to != address(0), "ERC777: send to the zero address"); _callTokensToSend(operator, from, to, amount, userData, operatorData); _move(operator, from, to, amount, userData, operatorData); _callTokensReceived(operator, from, to, amount, userData, operatorData, requireReceptionAck); } /** * @dev Burn tokens * @param operator address operator requesting the operation * @param from address token holder address * @param amount uint256 amount of tokens to burn * @param data bytes extra information provided by the token holder * @param operatorData bytes extra information provided by the operator (if any) */ function _burn( address operator, address from, uint256 amount, bytes memory data, bytes memory operatorData ) private { require(from != address(0), "ERC777: burn from the zero address"); _callTokensToSend(operator, from, address(0), amount, data, operatorData); // Update state variables _balances[from] = _balances[from].sub(amount, "ERC777: burn amount exceeds balance"); _totalSupply = _totalSupply.sub(amount); emit Burned(operator, from, amount, data, operatorData); emit Transfer(from, address(0), amount); } function _move( address operator, address from, address to, uint256 amount, bytes memory userData, bytes memory operatorData ) private { _balances[from] = _balances[from].sub(amount, "ERC777: transfer amount exceeds balance"); _balances[to] = _balances[to].add(amount); emit Sent(operator, from, to, amount, userData, operatorData); emit Transfer(from, to, amount); } function _approve(address holder, address spender, uint256 value) private { // TODO: restore this require statement if this function becomes internal, or is called at a new callsite. It is // currently unnecessary. //require(holder != address(0), "ERC777: approve from the zero address"); require(spender != address(0), "ERC777: approve to the zero address"); _allowances[holder][spender] = value; emit Approval(holder, spender, value); } /** * @dev Call from.tokensToSend() if the interface is registered * @param operator address operator requesting the transfer * @param from address token holder address * @param to address recipient address * @param amount uint256 amount of tokens to transfer * @param userData bytes extra information provided by the token holder (if any) * @param operatorData bytes extra information provided by the operator (if any) */ function _callTokensToSend( address operator, address from, address to, uint256 amount, bytes memory userData, bytes memory operatorData ) private { address implementer = _erc1820.getInterfaceImplementer(from, TOKENS_SENDER_INTERFACE_HASH); if (implementer != address(0)) { IERC777Sender(implementer).tokensToSend(operator, from, to, amount, userData, operatorData); } } /** * @dev Call to.tokensReceived() if the interface is registered. Reverts if the recipient is a contract but * tokensReceived() was not registered for the recipient * @param operator address operator requesting the transfer * @param from address token holder address * @param to address recipient address * @param amount uint256 amount of tokens to transfer * @param userData bytes extra information provided by the token holder (if any) * @param operatorData bytes extra information provided by the operator (if any) * @param requireReceptionAck if true, contract recipients are required to implement ERC777TokensRecipient */ function _callTokensReceived( address operator, address from, address to, uint256 amount, bytes memory userData, bytes memory operatorData, bool requireReceptionAck ) private { address implementer = _erc1820.getInterfaceImplementer(to, TOKENS_RECIPIENT_INTERFACE_HASH); if (implementer != address(0)) { IERC777Recipient(implementer).tokensReceived(operator, from, to, amount, userData, operatorData); } else if (requireReceptionAck) { require(!to.isContract(), "ERC777: token recipient contract has no implementer for ERC777TokensRecipient"); } } uint256[50] private ______gap; } // File: @openzeppelin/contracts-ethereum-package/contracts/access/Roles.sol 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(!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]; } } // File: @openzeppelin/contracts-ethereum-package/contracts/access/roles/PauserRole.sol pragma solidity ^0.5.0; contract PauserRole is Initializable, Context { using Roles for Roles.Role; event PauserAdded(address indexed account); event PauserRemoved(address indexed account); Roles.Role private _pausers; function initialize(address sender) public initializer { if (!isPauser(sender)) { _addPauser(sender); } } modifier onlyPauser() { require(isPauser(_msgSender()), "PauserRole: caller does not have the Pauser role"); _; } function isPauser(address account) public view returns (bool) { return _pausers.has(account); } function addPauser(address account) public onlyPauser { _addPauser(account); } function renouncePauser() public { _removePauser(_msgSender()); } function _addPauser(address account) internal { _pausers.add(account); emit PauserAdded(account); } function _removePauser(address account) internal { _pausers.remove(account); emit PauserRemoved(account); } uint256[50] private ______gap; } // File: @openzeppelin/contracts-ethereum-package/contracts/lifecycle/Pausable.sol pragma solidity ^0.5.0; /** * @dev Contract module which allows children to implement an emergency stop * mechanism that can be triggered by an authorized account. * * This module is used through inheritance. It will make available the * modifiers `whenNotPaused` and `whenPaused`, which can be applied to * the functions of your contract. Note that they will not be pausable by * simply including this module, only once the modifiers are put in place. */ contract Pausable is Initializable, Context, PauserRole { /** * @dev Emitted when the pause is triggered by a pauser (`account`). */ event Paused(address account); /** * @dev Emitted when the pause is lifted by a pauser (`account`). */ event Unpaused(address account); bool private _paused; /** * @dev Initializes the contract in unpaused state. Assigns the Pauser role * to the deployer. */ function initialize(address sender) public initializer { PauserRole.initialize(sender); _paused = false; } /** * @dev Returns true if the contract is paused, and false otherwise. */ function paused() public view returns (bool) { return _paused; } /** * @dev Modifier to make a function callable only when the contract is not paused. */ modifier whenNotPaused() { require(!_paused, "Pausable: paused"); _; } /** * @dev Modifier to make a function callable only when the contract is paused. */ modifier whenPaused() { require(_paused, "Pausable: not paused"); _; } /** * @dev Called by a pauser to pause, triggers stopped state. */ function pause() public onlyPauser whenNotPaused { _paused = true; emit Paused(_msgSender()); } /** * @dev Called by a pauser to unpause, returns to normal state. */ function unpause() public onlyPauser whenPaused { _paused = false; emit Unpaused(_msgSender()); } uint256[50] private ______gap; } // File: @openzeppelin/contracts-ethereum-package/contracts/ownership/Ownable.sol pragma solidity ^0.5.0; /** * @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 aplied to your functions to restrict their use to * the owner. */ contract Ownable is Initializable, Context { address private _owner; event OwnershipTransferred(address indexed previousOwner, address indexed newOwner); /** * @dev Initializes the contract setting the deployer as the initial owner. */ function initialize(address sender) public initializer { _owner = sender; emit OwnershipTransferred(address(0), _owner); } /** * @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; } uint256[50] private ______gap; } // File: contracts/Recoverable.sol /** * Based on https://github.com/TokenMarketNet/smart-contracts/blob/master/contracts/Recoverable.sol */ pragma solidity ^0.5.0; /** * Allows to recover any tokens accidentally send on the smart contract. * * Sending ethers on token contracts is not possible in the first place. * as they are not payable. * * https://twitter.com/moo9000/status/1238514802189795331 */ contract Recoverable is Ownable { function initialize(address sender) public initializer { super.initialize(sender); } /// @dev This will be invoked by the owner, when owner wants to rescue tokens /// @param token Token which will we rescue to the owner from the contract function recoverTokens(IERC20 token) public onlyOwner { require(token.transfer(owner(), tokensToBeReturned(token)), "Transfer failed"); } /// @dev Interface function, can be overwritten by the superclass /// @param token Token which balance we will check and return /// @return The amount of tokens (in smallest denominator) the contract owns function tokensToBeReturned(IERC20 token) public view returns (uint) { return token.balanceOf(address(this)); } // Upgradeability - add some space uint256[50] private ______gap; } // File: contracts/DawnTokenImpl.sol pragma solidity ^0.5.0; // https://github.com/OpenZeppelin/openzeppelin-contracts-ethereum-package/tree/master/contracts/token/ERC777 /** * First implementation of Dawn token. * * Needs to be set up behind a proxy contract. * * We use a modified OpenZeppelin ERC777 contract, as otherwise we cannot * override send(), transfer() and transferFrom(), etc. from the parent contract * as they are marked external. * EVM currently does not allow overriding of external functions. * Changing the call signatures for the required functions * was the only change done on ERC777Overridable.sol contract - otherwise * it is a vanilla copy of * https://github.com/OpenZeppelin/openzeppelin-contracts-ethereum-package/blob/bf0277b398c0454276bd8caf0ee35efaf46e686b/contracts/token/ERC777/ERC777.sol * */ contract DawnTokenImpl is ERC777Overridable, Recoverable, Pausable { /** * Create the first Dawn token. * * We are using a function name `initializeDawn` instead of `initialize` * as otherwise we get a function override name clash with same number of parameters * that are different type. The web3.js code * will try to call the initializer() of a ERC777Overridable with a wrong signature and this is the error: * * expected array value (arg="defaultOperators", coderType="array", value="NEW") * * @param manager The address that is going ot control Pausable functionality and also receive the initially minted tokens * @param _name Token name * @param _symbol Token symbol */ function initializeDawn(address manager, string memory _name, string memory _symbol) public initializer { // We set up an ERC-777 token without any default operators address[] memory noAddresses = new address[](0); bytes memory emptyBytes = bytes(''); ERC777Overridable.initialize(_name, _symbol, noAddresses); // Initializes owner() for recoverTokens Recoverable.initialize(manager); // Initializes pauser Pausable.initialize(manager); // Same as in 1ST token // https://etherscan.io/token/0xaf30d2a7e90d7dc361c8c4585e9bb7d2f6f15bc7 uint INITIAL_SUPPLY = 93468683899196345527500000; // Mint the initial supply // https://github.com/OpenZeppelin/openzeppelin-contracts-ethereum-package/blob/master/contracts/token/ERC777/ERC777.sol#L315 _mint(manager, manager, INITIAL_SUPPLY, emptyBytes, emptyBytes); } // // We override methods from ERC777 and add whenNotPaused modifier and external keyword // (external is required by ERC-777 standard) // function send(address recipient, uint256 amount, bytes calldata data) external whenNotPaused { sendInternal(recipient, amount, data); } function transfer(address to, uint256 value) external whenNotPaused returns (bool) { return transferInternal(to, value); } function transferFrom(address from, address to, uint256 value) external whenNotPaused returns (bool) { return transferFromInternal(from, to, value); } function burn(uint256 amount, bytes calldata data) external whenNotPaused { burnInternal(amount, data); } function operatorSend( address sender, address recipient, uint256 amount, bytes calldata data, bytes calldata operatorData ) external whenNotPaused { operatorSendInternal(sender, recipient, amount, data, operatorData); } function operatorBurn(address account, uint256 amount, bytes calldata data, bytes calldata operatorData) external whenNotPaused { operatorBurnInternal(account, amount, data, operatorData); } // Upgradeability - add some space uint256[50] private ______gap; }
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nction"},{"constant":true,"inputs":[],"name":"granularity","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"sender","type":"address"}],"name":"initialize","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"string","name":"name","type":"string"},{"internalType":"string","name":"symbol","type":"string"},{"internalType":"address[]","name":"defaultOperators","type":"address[]"}],"name":"initialize","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"manager","type":"address"},{"internalType":"string","name":"_name","type":"string"},{"internalType":"string","name":"_symbol","type":"string"}],"name":"initializeDawn","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"operator","type":"address"},{"internalType":"address","name":"tokenHolder","type":"address"}],"name":"isOperatorFor","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"isOwner","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"isPauser","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"account","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"bytes","name":"operatorData","type":"bytes"}],"name":"operatorBurn","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"sender","type":"address"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"},{"internalType":"bytes","name":"operatorData","type":"bytes"}],"name":"operatorSend","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[],"name":"pause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"paused","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"}],"name":"recoverTokens","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"renounceOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"renouncePauser","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"operator","type":"address"}],"name":"revokeOperator","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"send","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"contract IERC20","name":"token","type":"address"}],"name":"tokensToBeReturned","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"from","type":"address"},{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"value","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"unpause","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"}]
Contract Creation Code
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Multichain Portfolio | 26 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.