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 0x15a10080f18b66338f6a95bbd0626d8dc2d447e83002516bbadfac9ad025bcdc. Chain 2 (Bitcoin): anchored in block 953719 (2026-06-15T01:07:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/88fe8e91-a792-4b42-9a08-598726e20314.json and https://artists.proofprofile.net/proofs/artist/88fe8e91-a792-4b42-9a08-598726e20314.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Andrea Padova: Notes Posted on the Refrigerator
Johann Sebastian Bach: French Overture, Italian Concerto, Four Fragments
Johann Sebastian Bach: Complete Fantasias
J.S. Bach & A. Padova: Preludes & Interludes
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 0x227fb433a9e52846df800eb89b1164ae012a629c1c08c3cf1f9ecfc135a9254f. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CHC282061102.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITUM71900430.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITUM71900431.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITUM71900432.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITUM71900433.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITUM71900434.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITUM71900435.
Concerto for 2 Harpsichords, Strings & Continuo in C Major, BWV 1061: 1. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb77aa4b09e9b96af52daa623f90af7ce429da5277c08f04d0d8c8823ed7f4bab. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/ITUM71900458.
Concerto for 2 Harpsichords, Strings & Continuo in C Major, BWV 1061: 2. Adagio ovvero Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb5462aef8a8ca99b2b86c162aa2313d69cef311902f8775a714a0a71d24a27. 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/ITUM71900459.
Concerto for 2 Harpsichords, Strings & Continuo in C Major, BWV 1061: 3. Fuga
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba282c06552f2ea311a294438b63109a260e8765cb39a3fa66924b8edbc13e9b. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/ITUM71900460.