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 0x01b3e87a3b48ea01a310519d6a7015b3e8168baf6a3c54af6ef6a80d8509ef5d. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/52a759f8-1067-4f83-9a91-229782336bbc.json and https://artists.proofprofile.net/proofs/artist/52a759f8-1067-4f83-9a91-229782336bbc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Claudio Monteverdi: Vespro della Beata Vergine (Marienvesper)
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 0x574e68b47f5a09db482f8b4250239d761e52e71b84ec2e68a8eaeee31ad3634c. 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/DEN421113001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8daed03c72f49b6e52b2b1801b2612406546da966e30925199550539598107ae. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEN421113003.
Knabenchor Hannover: Michaelisvesper mit Werken von Michael Praetorius
Musae Sioniae V: Komm, heiliger Geist, Herre Gott
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c789f0331779a3c8b36b64ff14672135345a1924bec5a3aad5421695c380ef. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEN420902002.
Johann Sebastian Bach: Markus-Passion BWV 247
Markus-Passion BWV 247: Chor: Geh, Jesu, geh zu deiner Pein!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9569c79d7a62bb74df029083f813e2c8be27639e54785a7ba5f6171f3b63b1da. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEN421402001.
Markus-Passion BWV 247: Rezitativ: Und nach zween Tagen war Ostern - Chor: Ja nicht auf das Fest - Rezitativ: Und da er in Bethanien war - ...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57ca59441752dff78be254167fc4c908d70b8ffc928fda0537648aedf84bec19. 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/DEN421402002.
Markus-Passion BWV 247: Choral: Jesu, ohne Missetat
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc992a0955f5e7a2431b3c635336ab8b2d74d9144c757fe70c6eb89124a2155e9. 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/DEN421402021.