Blockchain Transaction Timestamp Proof for Off-Chain Double-Spend Detection

The patent applies preliminary action by requiring the sending party to generate a signed timestamp proof before transmitting the off-chain transaction. This timestamp proof serves as advance verification that the transaction has not been previously spent, preventing double spending while maintaining off-chain speed advantages. The timestamp is generated and signed in advance, creating a verifiable record before the actual transaction occurs.

The patent introduces a timestamp intermediary mechanism that mediates between the sending and receiving parties. Instead of directly trusting each other for off-chain transactions, parties use a verifiable timestamp as an intermediary proof of transaction order and authenticity. This timestamp intermediary resolves the trust issue inherent in off-chain transactions while maintaining speed.

The patent applies parameter changes by transforming the transaction data structure to include a timestamp field and a signature field. These are simple parameter additions that enable verification without fundamentally changing the transaction protocol. The timestamp and signature are appended to existing transaction data, making verification straightforward while maintaining compatibility with standard blockchain transaction formats.

The patent implements self-service verification where each party independently verifies the timestamp signature using the other party's public key. No external verification service or additional infrastructure is required - the verification is performed locally by the receiving party using standard cryptographic operations. This keeps the system simple and decentralized.