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 0x41f3c56baabfae8f3da8eba079727c9014ac21f2f443333faf2e147b0dda469a. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/761f2af2-e3fc-45c1-bec9-b2098996e110.json and https://artists.proofprofile.net/proofs/artist/761f2af2-e3fc-45c1-bec9-b2098996e110.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Concerto for 4 Pianos in A Minor, BWV 1065: I. Allegro
Orchestre National Du Capitole De Toulouse
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 0xff89678c93661625c0dabf3dc07bec947da24ce12d9c902d9e3c0e4c89c14fb1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1801247 — a six-check JSON result.
Bach, JS: Concerto for 4 Pianos in A Minor, BWV 1065: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff89678c93661625c0dabf3dc07bec947da24ce12d9c902d9e3c0e4c89c14fb1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1801247 — a six-check JSON result.
Bach, JS: Concerto for 2 Pianos in C Minor, BWV 1060: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2adb153cc3360e2e1f7e9883cff98728fecb1078a9ed3b7eeee2bdcf27bb603c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1801239 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff89678c93661625c0dabf3dc07bec947da24ce12d9c902d9e3c0e4c89c14fb1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1801247 — a six-check JSON result.
Bach, JS: Concerto for 4 Pianos in A Minor, BWV 1065: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x349dd8f6fd3ec6f46bad338c5b15f86b2decc54a76e9dc364af075e7e191b6d8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1801248 — a six-check JSON result.
Bach, JS: Concerto for 4 Pianos in A Minor, BWV 1065: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f387756b1ede4a3c9d154454a057e503f886965ee2b74d644b49aacfc6aa11e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1801249 — a six-check JSON result.
Bach, JS: Concerto for 3 Pianos in D Minor, BWV 1063: I. —
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd84e72798107fa5618c8e5e7ad2879bda54ffbc87f4d5f4a82eefd7b70355ae. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1801244 — a six-check JSON result.
Bach, JS: Concerto for 3 Pianos in D Minor, BWV 1063: II. Alla siciliana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x578256e3d07d62168d16e4bd8dcdf45fbaa61be8b0efb2ff6b7e5aa7659e483d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1801245 — a six-check JSON result.
Bach, JS: Concerto for 3 Pianos in D Minor, BWV 1063: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85ecb7cb2c0d872cf82f943975f4f29f52ce39bb7131c057e7c773fd3b5b6c37. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1801246 — a six-check JSON result.
Bach, JS: Concerto for 2 Pianos in C Minor, BWV 1060: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e93d214012bb74926cd62f7a9fdd0968f18f3c30b9fc695898618c39e776d95. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1801238 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2adb153cc3360e2e1f7e9883cff98728fecb1078a9ed3b7eeee2bdcf27bb603c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBAYC1801239 — a six-check JSON result.
Bach, JS: Concerto for 2 Pianos in C Minor, BWV 1060: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97a320034a6f045f0119b99fe722bd3eb6d663cb628d2d28bed44a6978689214. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1801240 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e93d214012bb74926cd62f7a9fdd0968f18f3c30b9fc695898618c39e776d95. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1801238 — a six-check JSON result.