Denise Duval (23 October 192125 January 2016) was a French soprano, best known for her performances in the works of Francis Poulenc on stage and in recital. During an international career, Duval creat
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 0x0d34daf8fb2e6f8be4fc57f4bf343c87b778eeb90a06d35e9ea4fd924852e7e3. Chain 2 (Bitcoin): anchored in block 953864 (2026-06-16T00:30:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/03f9e455-116e-459f-9431-993cb748cc6f.json and https://artists.proofprofile.net/proofs/artist/03f9e455-116e-459f-9431-993cb748cc6f.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Ravel: L'heure espagnole, M. 52: Introduction
Orchestre Du Theatre National De L'Opera Comique
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0x475cdbf68c610e14ba33337578416d35bff6fc0aae838cdba36e0fd2a7946871. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206845 — a six-check JSON result.
Ravel: L'heure espagnole, M. 52: "C'est fait ! L'horloge est à sa place" (Ramiro, Concepción, Gonzalve)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcad488c02e1bc05a802fed1535d0d2e6ac586a419dbcdac89085d3225196b91b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206850 — a six-check JSON result.
Ravel: L'heure espagnole, M. 52: "Maintenant, pas de temps à perdre !" (Concepción, Gonzalve)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0901d74c860ac4606eb87f496d2ab48904331cf928ef4277c8b1b92d59f21aad. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206851 — a six-check JSON result.
Ravel: L'heure espagnole, M. 52: "Voilà ! Et maintenant à l'autre !" (Ramiro, Íñigo, Concepción)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1441b8aa98aea3ea4fc87d3f7e3160d412b9033fd604b2590e212b894b68087. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115206854 — a six-check JSON result.