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Outline

• interface IBeacon
•    - function latestCopy()
•  contract BeaconProxy *
•    - function _setBeacon(address _beacon)
•    - function _getBeacon()
•    - function _getMasterCopy()
• library AddressUpgradeable
•    - function isContract(address account)
•    - function sendValue(address payable re ...
•    - function functionCall(address target, ...
•    - function functionCall(address target, ...
•    - function functionCallWithValue(addres ...
•    - function functionCallWithValue(addres ...
•    - function functionStaticCall(address t ...
•    - function functionStaticCall(address t ...
•    - function _verifyCallResult(bool succe ...
•    - function __Context_init()
•    - function __Context_init_unchained()
•    - function _msgSender()
•    - function _msgData()
•    - function __Ownable_init()
•    - function __Ownable_init_unchained()
•    - function owner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•  contract OperatorRole is OwnableUp ...
•    - function _initializeOperatorRole()
•    - function isOperator(address account)
•    - function addOperator(address account)
•    - function removeOperator(address accou ...
•    - function renounceOperator()
•    - function _addOperator(address account ...
•    - function _removeOperator(address acco ...
•  contract Beacon is OperatorRole, I ... *
•    - function upgradeTo(address _nextCopy)
•    - function deploy(string calldata _name ...
•    - function getAddress(string calldata _ ...

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/**
 *Submitted for verification at Etherscan.io on 2021-04-22
*/

// File contracts/beacon/IBeacon.sol

pragma solidity ^0.8.0;

interface IBeacon {
    function latestCopy() external view returns(address);
}


// File contracts/beacon/BeaconProxy.sol

pragma solidity ^0.8.0;

contract BeaconProxy {

    bytes32 private constant BEACON_SLOT = keccak256(abi.encodePacked("fairmint.beaconproxy.beacon"));

    constructor() public {
        _setBeacon(msg.sender);
    }

    function _setBeacon(address _beacon) private {
        bytes32 slot = BEACON_SLOT;
        assembly {
            sstore(slot, _beacon)
        }
    }

    function _getBeacon() internal view returns(address beacon) {
        bytes32 slot = BEACON_SLOT;
        assembly {
            beacon := sload(slot)
        }
    }

    function _getMasterCopy() internal view returns(address) {
        IBeacon beacon = IBeacon(_getBeacon());
        return beacon.latestCopy();
    }

    fallback() external payable {
        address copy = _getMasterCopy();
        assembly {
            calldatacopy(0, 0, calldatasize())
            let result := delegatecall(gas(), copy, 0, calldatasize(), 0, 0)
            let size := returndatasize()
            returndatacopy(0, 0, size)
            switch result
            case 0 { revert(0, size) }
            default { return(0, size) }
        }
    }
}


// File @openzeppelin/contracts-upgradeable/utils/[email protected]


pragma solidity ^0.8.0;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @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);
    }

    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);
            }
        }
    }
}


// File @openzeppelin/contracts-upgradeable/proxy/utils/[email protected]


// solhint-disable-next-line compiler-version
pragma solidity ^0.8.0;

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 */
abstract 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 protect an initializer function from being invoked twice.
     */
    modifier initializer() {
        require(_initializing || !_initialized, "Initializable: contract is already initialized");

        bool isTopLevelCall = !_initializing;
        if (isTopLevelCall) {
            _initializing = true;
            _initialized = true;
        }

        _;

        if (isTopLevelCall) {
            _initializing = false;
        }
    }
}


// File @openzeppelin/contracts-upgradeable/utils/[email protected]


pragma solidity ^0.8.0;

/*
 * @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 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.
 */
abstract contract ContextUpgradeable is Initializable {
    function __Context_init() internal initializer {
        __Context_init_unchained();
    }

    function __Context_init_unchained() internal initializer {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
    uint256[50] private __gap;
}


// File @openzeppelin/contracts-upgradeable/access/[email protected]


pragma solidity ^0.8.0;


/**
 * @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.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * 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.
 */
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal initializer {
        __Context_init_unchained();
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal initializer {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the 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 virtual 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 virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
    uint256[49] private __gap;
}


// File contracts/mixins/OperatorRole.sol

pragma solidity ^0.8.0;

// Original source: openzeppelin's SignerRole

/**
 * @notice allows a single owner to manage a group of operators which may
 * have some special permissions in the contract.
 */
contract OperatorRole is OwnableUpgradeable {
    mapping (address => bool) internal _operators;

    event OperatorAdded(address indexed account);
    event OperatorRemoved(address indexed account);

    function _initializeOperatorRole() internal {
        __Ownable_init();
        _addOperator(msg.sender);
    }

    modifier onlyOperator() {
        require(
            isOperator(msg.sender),
            "OperatorRole: caller does not have the Operator role"
        );
        _;
    }

    function isOperator(address account) public view returns (bool) {
        return _operators[account];
    }

    function addOperator(address account) public onlyOwner {
        _addOperator(account);
    }

    function removeOperator(address account) public onlyOwner {
        _removeOperator(account);
    }

    function renounceOperator() public {
        _removeOperator(msg.sender);
    }

    function _addOperator(address account) internal {
        _operators[account] = true;
        emit OperatorAdded(account);
    }

    function _removeOperator(address account) internal {
        _operators[account] = false;
        emit OperatorRemoved(account);
    }

    uint[50] private ______gap;
}


// File contracts/beacon/Beacon.sol

pragma solidity ^0.8.0;



contract Beacon is OperatorRole, IBeacon {

    address public override latestCopy;

    address[] public history;

    mapping(string => address) public proxies;

    constructor(address _initialCopy) public {
        latestCopy = _initialCopy;
        _initializeOperatorRole();
    }

    function upgradeTo(address _nextCopy) external onlyOwner {
        latestCopy = _nextCopy;
    }

    function deploy(string calldata _name) external onlyOperator returns(address addr){
        bytes memory bytecode = type(BeaconProxy).creationCode;
        bytes32 salt = keccak256(abi.encodePacked(_name));
        assembly {
            addr := create2(0, add(bytecode, 0x20), mload(bytecode), salt)
        }
        require(addr != address(0), "error while deploying");
        proxies[_name] = addr;
    }

    function getAddress(string calldata _name) external view returns (address) {
        return proxies[_name];
    }
}

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00000000000000000000000062c3d77893edbdf492330295e33f98a7f3ba5bbc

-----Decoded View---------------
Arg [0] : _initialCopy (address): 0x62c3d77893EdBdF492330295E33f98a7F3ba5BBc

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 00000000000000000000000062c3d77893edbdf492330295e33f98a7f3ba5bbc

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ipfs://a5cc464f30d2dd6ac5dce942a2527a57478536e2ba4b4927b5d781e06d2c6a5f