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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd22eff6d9da4898125b25ebc8df1a1ce4f7d68fc1733a0920ccd032fedf16310. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fe73523b-49c8-40c6-b41e-fed22ca4c911.json and https://artists.proofprofile.net/proofs/artist/fe73523b-49c8-40c6-b41e-fed22ca4c911.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Franck: String Quartet in D Major & Piano Quintet in F Minor
String Quartet in D Major, FWV 9: III. Larghetto
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6537aff226834881118b5122aa4a2540e36202aa2f647531cb48ec9ef8b53942. 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/DEB201308803.
String Quartet in D Major, FWV 9: IV. Finale. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ba7369e142d5d224dcfc5c74612400bec758b85d35b73c30a3886180d817711. 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/DEB201308804.
Piano Quintet in F Minor, FWV 7: II. Lento, con molto sentimento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x823dec3bb4f1519cedbb55e49cbad24f66498a015cf9fe47e61915c3636c922e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB201308806.
String Quartet in D Major, FWV 9: I. Poco lento - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e8c8d3cb890094f6507edb6ca7dd81745ac94b8cbbb0e18ccfbc3d5b7bdb9be. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DEB201308801.
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
String Quartet in D Major, FWV 9: II. Scherzo. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5853ece0422b6ca8526bd3a8b31970fb9f9fce5c0045044d2cb5c96af2bff0d0. 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/DEB201308802.
Piano Quintet in F Minor, FWV 7: I. Molto moderato, quasi lento - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a488e32935555fe4cb5ec973455080516af4c622b5b338feb43809b2eb3ae10. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEB201308805.
Piano Quintet in F Minor, FWV 7: III. Allegro non troppo, ma con fuoco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad9721fb57f1eb633e57861a9741e698aaf37056131617e69a95b6b5c9b05fa8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB201308807.