TokenWrapper

BitClave implementation of TokenWrapper contract to upgrade any existing pausable OpenZeppelin token

Installation

1. Install truffle globally with npm install -g truffle
2. Install ganache-cli globally with npm install -g ganache-cli
3. Install local packages with npm install
4. Run ganache-cli in separate terminal scripts/rpc.sh
5. Run tests with npm test

On macOS you also need to install watchman: brew install watchman

Features

1. Add any functionality to your token without migrating any holders
2. Requires token to be at least Pausable
3. Supports a lot of OpenZeppelin tokens:
   • BasicTokenWrapper for BasicToken
   • StandardTokenWrapper for StandardToken
   • BurnableTokenWrapper for BurnableToken
   • MintableToken itself
   • More coming soon ...

Example of simple MyToken upgrade

contract MyToken is StandardToken, PausableToken {

    string public constant symbol = "MYT";
    string public constant name = "MyToken";
    uint8 public constant decimals = 18;
    string public constant version = "1.0";

    function MyToken() public {
        totalSupply_ = 1000000 * 10**decimals;
        balances[msg.sender] = totalSupply_;
    }
    
}

You just need to pause() it and create new upgraded token, based on the previous one:

contract MyToken2 is StandardTokenWrapper, PausableToken {

    string public constant symbol = "MYT";
    string public constant name = "MyToken";
    uint8 public constant decimals = 18;
    string public constant version = "2.0";

    function MyToken2(address _token) public StandardTokenWrapper(_token) {
    }

    // Modern approve method from ERC827
    function approve(address _spender, uint256 _value, bytes _data) public returns(bool) {
        require(_spender != address(this));
        super.approve(_spender, _value);
        require(_spender.call(_data));
        return true;
    }

}