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 0x4aec0deba566d3ca579ec036effefc5c75a86f399fcaabad307b41d1f33115b8. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dab9ba92-dc98-408f-99eb-3c90e3490ce7.json and https://artists.proofprofile.net/proofs/artist/dab9ba92-dc98-408f-99eb-3c90e3490ce7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sinfonia melodica for 2 Oboes, Strings and Basso Continuo in C Major, TWV 50:2: VII. Gigue en Canarie. Très vite
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 0x161e4640137ab2383d42252ec06d88a2e8e19218ceb7670eab0710759c4cdd33. 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/DEN960500187.
Sinfonia melodica for 2 Oboes, Strings and Basso Continuo in C Major, TWV 50:2: V. Loure
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c6c962e5ac5e3d7b84b49843298b0cafae9c04b5aa57b2c6628df0b4dcbe8ae. 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/DEN960500185.
Overture for Violin, 2 Oboes, Strings and Basso continio in C minor, TWV 55:c4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e33f7995f4a3e7f5398c6992326976e42e9669bd212214e9770d14b55ee5968. 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/DEN960500130.
Sinfonia melodica for 2 Oboes, Strings and Basso Continuo in C Major, TWV 50:2: I. Vivace assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6222e87f4ccf4c59971c0bd19089d7a331a397104eaad245dabd3507f988230e. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DEN960500181.
Sinfonia melodica for 2 Oboes, Strings and Basso Continuo in C Major, TWV 50:2: II. Sarabande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb643e58541fa5a29d8cff40e23f94359c1ceec837c7e1f4cce350b7614cc3dec. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEN960500182.
Sinfonia melodica for 2 Oboes, Strings and Basso Continuo in C Major, TWV 50:2: III. Bourrée
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2401e2dd96fc03cbe15e2a3bd16fc3787af08f2584913386c0140a9409b17ea. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/DEN960500183.
Sinfonia melodica for 2 Oboes, Strings and Basso Continuo in C Major, TWV 50:2: IV. Menuet en Rondeau
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67cb74840bab5b829584e25e03fa059f4dc2bf49fa4b3eb21658efedc8eb22be. 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/DEN960500184.
Sinfonia melodica for 2 Oboes, Strings and Basso Continuo in C Major, TWV 50:2: VI. Chaconnette
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b69c20c78beaa637e479345c9c057e33fd0facac8c5062472567303e8834a3. 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/DEN960500186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x161e4640137ab2383d42252ec06d88a2e8e19218ceb7670eab0710759c4cdd33. 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/DEN960500187.