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 0x43b52a1ae7b9062ba097944d9c7f1e5399a09168240d40fbaa72b757336a99bb. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/09ceb80e-3cba-426b-afd4-c73ebf2efaa0.json and https://artists.proofprofile.net/proofs/artist/09ceb80e-3cba-426b-afd4-c73ebf2efaa0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Wolf: Italian Serenade & String Quartet in D Minor (Remastered)
String Quartet in B Minor, Op. 58, No. 4, G. 245: I. Allegro molto
Boccherini: String Quartets (Remastered)
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 0xa5ef997612019740d0563b92124defa81c9d95b01ac23ca08809d7a2e5018b8b. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/USSM11900681.
String Quartet in B Minor, Op. 58, No. 4, G. 245: II. Andantino lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc47834f7d909180df28c882c1d5d4ef55ccaa8fec0c1486b1fd7963b8d0beaf8. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/USSM11900682.
String Quartet in B Minor, Op. 58, No. 4, G. 245: III. Rondeau - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ce9501b9843cf44e7cc44ae117b386c2bc1f6310ae7041aa4a27c6983e6e293. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USSM11900683.
String Quartet in B-Flat Major, Op. 2, No. 2, G. 160: I. Allegro non tanto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce966214648c154cf0039a4e291346f7fc6fccaa0aceb34b710519f1bff70dd3. 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/USSM11900685.
String Quartet in E-Flat Major, Op. 53, No. 1, G. 236: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fe4039f24a0bbd566c11ecd6702f88ebdb4fd8db7da451cdf7f44d55fef4e76. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/USSM11900689.
String Quartet in E-Flat Major, Op. 53, No. 1, G. 236: II. Tempo di minuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a56cf81d1b384ff21fbcbba1eca4af7a288a97a7ffe3af1d26e0b288875d302. 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/USSM11900690.
String Quartet in E-Flat Major, Op. 58, No. 2, G. 243: III. Larghetto malincolino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x287294b2e8dc4be02d6378b8ccb58d1be08b3384c1b93dd1c2df5fbcdb30e1c0. 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/USSM11900694.