thumb|280px|Antoine Duhamel in 2008.Antoine Duhamel (30 July 1925 – 11 September 2014) was a French composer, orchestra conductor and music teacher. Life and career Born in Valmondois in the Val-d'
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 0x5feb5c75b1c31c387c1ab379fced8bd715048f721b5faa0b4e26c49ccb14cce0. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b5886328-80cf-4daa-88ef-b6b42829fc1e.json and https://artists.proofprofile.net/proofs/artist/b5886328-80cf-4daa-88ef-b6b42829fc1e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Pierrot le fou (Bande originale du film)
Ferdinand - Bande originale du film "Pierrot le fou"
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 0x45260e50884ca14b33ec6e7534ac15da18c51bdb2a893396a10f9f85e04873e6. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/CH1956580110 — a six-check JSON result.
Soirée perdue - Bande originale du film "Pierrot le fou"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde69484cf65d241fa8bf7e235569dae9f48101e6f626706d5aeaf0e0f79c29bb. Chain 2 (Bitcoin): anchored in block 958969 (2026-07-21T04:58:13Z), 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/CH1956580040 — a six-check JSON result.
Belphegor (Original Motion Picture Soundtrack)
L'acrobate (Original Motion Picture Soundtrack)
L'acrobate (Bande originale du film / Remastered 2024)
Le singe fou (Bande originale du film de Fernando Trueba)
Duhamel: Contrebasse oblige - Chausson: Poème, Op. 25 - Ravel: Tzigane, M. 76
Belle époque (Bande originale du film de Fernando Trueba)
Tranvia a la Malvarrosa (Bande originale du film de José Luis García Sánchez)
La nina de tus ojos (Original Motion Picture Soundtrack)
Le plus beau pays du monde (Original Motion Picture Soundtrack)
Laissez-passer (Original Motion Picture Soundtrack)
Belle Epoque / El Mono Loco (Le Singe Fou)
Que la fête commence… (Bande originale du film)
Du rififi à la télé, Vol. 4: Bandes originales de polars télévisés
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x282440b1d727f3ba5e2da8c65865db50fe54caab6cd27dbe0184734562cc2c27. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/FR2X41468605 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85aff85d488ac2c4569c2bfb5744ef7266e39c6fbc42ecea39303c05dd28b6a7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CH1956580010 — a six-check JSON result.