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 0x8741ff78f08221c93120d5f0059f3011dc0747eb1ac1b70288bdfbaa308ce97c. Chain 2 (Bitcoin): anchored in block 953922 (2026-06-16T09:36:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1bd25b1d-c3bc-465a-817a-09788b44325e.json and https://artists.proofprofile.net/proofs/artist/1bd25b1d-c3bc-465a-817a-09788b44325e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Pierrot lunaire, Op. 21: No. 1, Ivresse de lune - Version française
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 0xee5aab28990de28e6358c870f6a10a9f0a43ceb31fb250c4ed4b54696f73a223. 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/FR00W2200260.
Pierrot lunaire, Op. 21: No. 2, Colombine - Version française
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07de9c2d7baea6924c41b83512dac9a7a89cd1115ecce1055205c898a5ed865c. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/FR00W2200261.
Pierrot lunaire, Op. 21: No. 3, Le dandy - Version française
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f2f9c97ea86e52498e413b5edb4c7755d4b0d32f1f3e8836bb919c72969b66. 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/FR00W2200262.
Pierrot lunaire, Op. 21: No. 4, Une pâle lavandière - Version française
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb92ed0437699c2c60121e40c3954798d49df3b9e255eaa7f993634576dea081. 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/FR00W2200263.
Pierrot lunaire, Op. 21: No. 5, Valse de Chopin - Version française
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65fdafb637097f9da6847293b005404b9ee28b4eb230b546ef36c8561cc63eb1. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/FR00W2200264.