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• library Create2
•    - function deploy(uint256 amount, bytes ...
•    - function computeAddress(bytes32 salt, ...
•    - function computeAddress(bytes32 salt, ...
•  contract MinimalProxyFactory *
•    - function computeAddress(uint256 salt, ...
•    - function deploy(
•    - function getContractCreationCode(addr ...

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/**
 *Submitted for verification at Etherscan.io on 2021-03-29
*/

// File: @openzeppelin/contracts/utils/Create2.sol

// SPDX-License-Identifier: MIT

pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Helper to make usage of the `CREATE2` EVM opcode easier and safer.
 * `CREATE2` can be used to compute in advance the address where a smart
 * contract will be deployed, which allows for interesting new mechanisms known
 * as 'counterfactual interactions'.
 *
 * See the https://eips.ethereum.org/EIPS/eip-1014#motivation[EIP] for more
 * information.
 */
library Create2 {
    /**
     * @dev Deploys a contract using `CREATE2`. The address where the contract
     * will be deployed can be known in advance via {computeAddress}.
     *
     * The bytecode for a contract can be obtained from Solidity with
     * `type(contractName).creationCode`.
     *
     * Requirements:
     *
     * - `bytecode` must not be empty.
     * - `salt` must have not been used for `bytecode` already.
     * - the factory must have a balance of at least `amount`.
     * - if `amount` is non-zero, `bytecode` must have a `payable` constructor.
     */
    function deploy(uint256 amount, bytes32 salt, bytes memory bytecode) internal returns (address) {
        address addr;
        require(address(this).balance >= amount, "Create2: insufficient balance");
        require(bytecode.length != 0, "Create2: bytecode length is zero");
        // solhint-disable-next-line no-inline-assembly
        assembly {
            addr := create2(amount, add(bytecode, 0x20), mload(bytecode), salt)
        }
        require(addr != address(0), "Create2: Failed on deploy");
        return addr;
    }

    /**
     * @dev Returns the address where a contract will be stored if deployed via {deploy}. Any change in the
     * `bytecodeHash` or `salt` will result in a new destination address.
     */
    function computeAddress(bytes32 salt, bytes32 bytecodeHash) internal view returns (address) {
        return computeAddress(salt, bytecodeHash, address(this));
    }

    /**
     * @dev Returns the address where a contract will be stored if deployed via {deploy} from a contract located at
     * `deployer`. If `deployer` is this contract's address, returns the same value as {computeAddress}.
     */
    function computeAddress(bytes32 salt, bytes32 bytecodeHash, address deployer) internal pure returns (address) {
        bytes32 _data = keccak256(
            abi.encodePacked(bytes1(0xff), deployer, salt, bytecodeHash)
        );
        return address(uint160(uint256(_data)));
    }
}

// File: contracts/helpers/MinimalProxyFactory.sol

pragma solidity 0.6.2;


contract MinimalProxyFactory {
    event MinimalProxyCreated(address minimalProxy);

    function computeAddress(uint256 salt, address implementation)
        public
        view
        returns (address)
    {
        return
            Create2.computeAddress(
                keccak256(abi.encodePacked(salt)),
                keccak256(getContractCreationCode(implementation)),
                address(this)
            );
    }

    function deploy(
        uint256 salt,
        address implementation
    ) public returns(address) {
        address minimalProxy = Create2.deploy(
            0,
            keccak256(abi.encodePacked(salt)),
            getContractCreationCode(implementation)
        );
        emit MinimalProxyCreated(minimalProxy);
        return minimalProxy;
    }

    function getContractCreationCode(address logic)
        internal
        pure
        returns (bytes memory)
    {
        bytes10 creation = 0x3d602d80600a3d3981f3;
        bytes10 prefix = 0x363d3d373d3d3d363d73;
        bytes20 targetBytes = bytes20(logic);
        bytes15 suffix = 0x5af43d82803e903d91602b57fd5bf3;
        return abi.encodePacked(creation, prefix, targetBytes, suffix);
    }
}

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[{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"minimalProxy","type":"address"}],"name":"MinimalProxyCreated","type":"event"},{"inputs":[{"internalType":"uint256","name":"salt","type":"uint256"},{"internalType":"address","name":"implementation","type":"address"}],"name":"computeAddress","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"salt","type":"uint256"},{"internalType":"address","name":"implementation","type":"address"}],"name":"deploy","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"nonpayable","type":"function"}]

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ipfs://d2cfd8528d05ab17336d63ce6a47d6b94303ed74fcf66d8ed623f10f001da833