Timestamping provides a digital seal of data integrity and a trusted date and time of when the transactions took place, that is, recipients of the documents can verify that they were not altered after the date the timestamp vouches for.
TSA-based supply chains work by digitizing physical assets and digitally signing them with a timestamp issued by a Trusted Third Party acting as a Time Stamping Authority (e.g. FNMT). It’s a centralized infrastructure, where all the concerned parts must trust the Authority.
Blockchain-based supply chains work by digitizing physical assets and recording them in a public ledger. This way, all participants in the decentralized network can track the state of a product, as well as all of its previous states and modifications. The transactions are submitted to the blockchain (e.g. Bitcoin), providing a bullet-proof chain from the original file to a tamper-proof timestamp in the blockchain.
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