thumb| Claire Désert (born 1967) is a French classical pianist. Biography Born in Angoulême, Désert began learning the piano at the age of five. At fourteen, she joined the Conservatoire de Paris
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112a710241f06c2476a9e89c2ac21090180d760cfaeb1bf893fd13eba47ab126. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/60003c63-b7d9-47c6-8174-2dea0b798ab1.json and https://artists.proofprofile.net/proofs/artist/60003c63-b7d9-47c6-8174-2dea0b798ab1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Claude Debussy: Musique de chambre (Chamber Music)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d844f2e7209a1df5475da2576e304290a7585630595806fe6ff4c7a1a7c56c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ130700400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x837428e740ea9a65f4ec1fa3786261230d2ab208a92eeae0fb03ccee971d7de7. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ130700280.
Danse slave en Mi Mineur pour piano à quatre mains, Op. 72: II. Dumka (Piano version)
La Folle Journée 2017: Le Rythme des Peuples
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6024a2c172982b32cc894d8110c1d70e00518dae5e44c4fe08973d17354b713f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRU621633019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39fad4b57c4427157ce34d68a58bed43cdb83ef0be6286dbdd96123f401681d4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPCP0800502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316e9a330426c42c6b6cea4495d6c83f93a8057b8532a2fbfbd223c540881f5d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPCP0800503.
Hungarian Dance No. 2 in D minor (arr.Joachim)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c83560e127f072af64e7fbd721e2a64d7a0b38b125ccd6369b29f66646ef348. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPCP0800504.
Ruralia Hungarica Op. 32c: Andante rubato alla zingaresca
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc393b3d6ebb1544faffd1b4b666012d95eb03bb5cd59fd5e480c02872774d18b. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBPCP0800501.
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