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 0x3be2dd1c7500119a1780bf901c9e4f302cf4edc0abaf6c56703a772db3c98fb5. Chain 2 (Bitcoin): anchored in block 954573 (2026-06-20T15:45:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b572d2cb-755a-4012-977b-1e5331fa5a61.json and https://artists.proofprofile.net/proofs/artist/b572d2cb-755a-4012-977b-1e5331fa5a61.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Symphony in E Minor for Piano 4 Hands: I. Allegro un poco agitato
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 0x9b1a274ca4fdf17d8158f45023fdc2a2e78ecc53a2f2eb1c3ea380f1ecbb2b55. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CHC282060801 — a six-check JSON result.
Concerto For 4 Harpsichords, Strings, And Continuo In A Minor, BWV 1065: 1. (Allegro)
Bach: Concertos For 2, 3, 4 Pianos & Strings
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac724aa3d4d3cf5519bb20b5e15c2c819bc6ee90ba7ec647d29231beba475a42. 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/ITUM71900430 — a six-check JSON result.
Concerto For 4 Harpsichords, Strings, And Continuo In A Minor, BWV 1065: 2. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7616eb16158a585f03bf0af476848cdcbf9d371eacc6b4bcb50eea538cfafcd. 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/ITUM71900431 — a six-check JSON result.
Concerto For 4 Harpsichords, Strings, And Continuo In A Minor, BWV 1065: 3. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f9461e2ccc39abfc6e9e6918260e1498dea3deedcd767c692bd64f9cbb27d6. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/ITUM71900432 — a six-check JSON result.
Concerto for 3 Harpsichords, Strings & Continuo No. 2 in C Major, BWV 1064: 1. (Allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8a5aaf8339defe8a48c6350bdc6fd7291368794b908dfcdd9e1e045ac717f6. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/ITUM71900433 — a six-check JSON result.
Concerto for 3 Harpsichords, Strings & Continuo No. 2 in C Major, BWV 1064: 2. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a56b7589e72b54248ab92ffc9449f9e2aff58e3612ef7f85354f27d93ef3387. 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/ITUM71900434 — a six-check JSON result.
Concerto for 3 Harpsichords, Strings & Continuo No. 2 in C Major, BWV 1064: 3. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x124b8bcf7275870bf56a38a945cd16d3ad4bde9bd5e485c03a7815eab29dcba5. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/ITUM71900435 — a six-check JSON result.
Concerto for 3 Harpsichords, Strings & Continuo No. 1 in D Minor, BWV 1063: 1. (Allegro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764462ff31e704f344320368532a82c74caf4cfdcd13e15dfad709d12570ccac. 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/ITUM71900436 — a six-check JSON result.
Concerto for 3 Harpsichords, Strings & Continuo No. 1 in D Minor, BWV 1063: 2. Alla siciliana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8bf8d84b974d54f1460c8797529f90833028bf968c842aeaee0ac8956119e8a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITUM71900437 — a six-check JSON result.