System, device and method for securely transferring information from a hardware to a blockchain

A data communication system for transferring data from a hardware unit to a blockchain or other distributed ledger, comprising:

• a hardware interface to connect to the hardware unit;
• a device in turn comprising
• a microcontroller,
• a secure element connected to the microcontroller,
• first communication module,
• a communication protocol for enabling the microcontroller to communicate with the hardware interface through the first communication module,
• wherein the microcontroller is configured to:
• read data from the hardware unit through the hardware interface;
• generate a transaction corresponding to the data;
• securely generate a blockchain private key, dB, and store it into the secure element;
• digitally sign the transaction by means of the blockchain private key, dB;
• deliver the signed transaction, and then delete the blockchain private key, dB, from the secure element characterized in that the microcontroller is adapted to generate a blockchain private key, dB, from parameters contained part in the device itself and part in the hardware interface.