thumb| Marie-Claude Chappuis is a Swiss mezzo-soprano particularly known for her performances in baroque operas and sacred music.. Life Chappuis was born in Fribourg and grew up in the village of
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 0x2439e6df13a92f65b74f0bc6699f04f77eed2d41a79b67feba4f41bf8fe0faec. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c0ba24ab-a698-4b6f-b7f8-f9198f63570c.json and https://artists.proofprofile.net/proofs/artist/c0ba24ab-a698-4b6f-b7f8-f9198f63570c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rameau: Pygmalion & Les Fêtes de Polymnie
Bach: Mass in B Minor, BWV 232: Et incarnatus est & Sanctus