Quantum key-based blockchain network and data secure transmission method

A quantum-secured blockchain network, comprising:

• a blockchain subnet comprising a plurality of blockchain nodes;
• and
• a quantum key distribution subnet comprising a plurality of quantum key distribution nodes and configured to distribute a shared quantum key between two of the quantum key distribution nodes, wherein
• the quantum key distribution nodes are deployed in the blockchain nodes, for the blockchain nodes to acquire the shared quantum key from the quantum key distribution nodes respectively;
• and
• the blockchain nodes are configured to:
• encrypt data using the shared quantum key, for secure transmission of the data between the blockchain nodes;
• and generate a message authentication code based on the shared quantum key and the data, for verifying completeness and authenticity, wherein the data comprises one or more of transaction information broadcast data and transaction information verification broadcast data,
• wherein the quantum key distribution nodes comprise a trusted relay node, a first user terminal node and a second user terminal node,
• each of the trusted relay node, the first user terminal node and the second user terminal node comprises a quantum key distribution device configured to perform quantum key distribution based on quantum mechanics, and
• the trusted relay node is configured to relay the shared quantum key between the first user terminal node and the second user terminal node.