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;
}

ERC20Mintable

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

import…

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