System and method for composite-key based blockchain device control, where the composite-key is created from control codes and a unique identification key. The control codes are used to control the blockchain device. The system uses the controlling system that can create controlling data. The system uses controlling data to control blockchain devices. The controlling data is used in conjunction with data in the blockchain. The system has methods for integrating with smart contracts to make execution of blockchain device depend on the smart contract. The system can be used for controlling financial activity, movement activity, asset activity, device activity, game activity. The system has methods for coupling controlling system with blockchain devices. The system has mechanisms to make blockchain device execution depend on the signature.