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Simple Proof is a document integrity verification service based on the Bitcoin blockchain. It uses the OpenTimestamps protocol to generate cryptographic fingerprints (hashes) of digital files and anchor these hashes to the Bitcoin blockchain, providing tamper-proof timestamp proofs. Users can upload documents via API or web interface, and the system automatically computes the hash and submits it to the blockchain. For verification, anyone can independently compare the file hash against the on-chain record to confirm the document has not been altered since a specific time. The service is suitable for government records, legal documents, audit reports, etc., requiring no trust in third parties and exposing only hashes, not document content.
