Verify smart contract request with multi-signature approach

First, create a mintable token

// SPDX-License-Identifier: MIT
// @nhancv
pragma solidity 0.8.4;

interface IMintable {
function mint(address account, uint256 amount) external;
}
// SPDX-License-Identifier: MIT
// @nhancv
pragma solidity 0.8.4;

import…