thumb| André Jean-Marie Isoir (20 July 1935 – 20 July 2016) was a French organist and pedagogue. Biography André Isoir was born in 1935 in Saint-Dizier in Grand Est, France. Isoir studied with Édo
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0f545a2412d67338bea0994c5f2b0d7c9b7bdea0145cd0df6d154ef83cdd35. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b40ea71-fc87-494a-9c63-c8cbc27b50f2.json and https://artists.proofprofile.net/proofs/artist/5b40ea71-fc87-494a-9c63-c8cbc27b50f2.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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