Philippe Caillard (born 1924 in Paris) is a French choral conductor, professor of music education, technical and pedagogical advisor to the Ministry of Youth and publisher of choral music. He made ab
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 0xae9e5d1b1bf9bc7a9ce1e957b8c0391a24d6b0f5ea3e2d64b0eaf15a880762ba. Chain 2 (Bitcoin): anchored in block 954580 (2026-06-20T17:48:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b622045f-7637-4cc6-a25f-649dd011eeb7.json and https://artists.proofprofile.net/proofs/artist/b622045f-7637-4cc6-a25f-649dd011eeb7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).