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 0xb111a80dd06ba0040f0af26bd8ca9ab8ce389206b42085d1b117f638298c1022. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fcf5b32d-ba78-4ebd-9109-e882ec44aea9.json and https://artists.proofprofile.net/proofs/artist/fcf5b32d-ba78-4ebd-9109-e882ec44aea9.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
César Franck: Violin Sonata, Piano Trio No.1 & Piano Quintet - Vierne: Piano Quintet
Piano Quintet in F Minor, FWV 7: I. Molto moderato quasi lento
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 0x5d98e15949bcdef56cafc60fa410a80247a0b412613202d0b835692e6710531e. 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/FR7JM2210010 — a six-check JSON result.
Violin Sonata in A Major, FWV 8: I. Allegretto ben moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b8c2c8c2813f7f34dc4fe24b979671f6b1621e02bdbaefad56e61318a06d46b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2211010 — a six-check JSON result.
Piano Quintet in F Minor, FWV 7: II. Lento con molto sentimento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37ac41f67b8c4c2083a8868ee4df3ccd50bdceb986c7c3a35376a1684b1f02df. 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/FR7JM2210020 — a six-check JSON result.
Piano Trio No. 1 in F-Sharp Minor, FWV 1, Op. 1 No. 1: I. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee7943e3b39cc8e6f534b0dd6dbe647496d6aa259473a8dc01024ed82e4e23e6. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2211050 — a six-check JSON result.
Robert Schumann: Complete Piano Trios, Quartet & Quintet
Piano Quartet in E-Flat Major, Op. 47: I. Sostenuto assai - Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd194e96ec594e54e080330eed22247adbc56b5a024a9150f389c873f661948. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2029010 — a six-check JSON result.
Piano Trio No. 1 in D Minor, Op. 63: I. Mit Energie und Leidenschaft
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88747a682d5da0573b40fdf79cd2626b2c39e5c77fedac775309359015a0da80. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/FR7JM2030010 — a six-check JSON result.
Piano Quartet in E-Flat Major, Op. 47: II. Scherzo. Molto vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc03174cf111c307f266f49d1b7d729c44f1eefee83ba2abf0bf3c72d74ce8118. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2029020 — a six-check JSON result.
Piano Quartet in E-Flat Major, Op. 47: III. Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c9d5a36ccd752180fb39dd8eaadef4859dc300c1ed3b52b499daaa7fc91b30. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/FR7JM2029030 — a six-check JSON result.
Piano Quartet in E-Flat Major, Op. 47: IV. Finale. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301dc01668907103d2dc5341ceb219a69e3695f37bcaee29a675f25fc538d3b2. 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/FR7JM2029040 — a six-check JSON result.
Piano Quintet in E-Flat Major, Op. 44: II. In Modo d'una Marcia. Un poco largamente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b9189e28f15b1ef1d7367508f59ed1f21c969c0fe19ea8a306b90af7ba24071. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2029060 — a six-check JSON result.
Piano Quintet in E-Flat Major, Op. 44: IV. Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f75470570cc60e7ba82f7c198835151d50b4b9da3e1b7e51f1ac08ff1c96643. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/FR7JM2029080 — a six-check JSON result.
Piano Quintet in G Minor, Op. 57: I. Prelude (Lento)
Shostakovich: Piano Quintet & Seven Romances on Poems by Alexander Blok
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1edca4c1a358498a90b473f4757b585c00496249973b8c5bbab2392c6182157. 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/FR7JM1907010 — a six-check JSON result.
Les plus belles musiques classiques pour les enfants
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8394013f1bf1e6cb08eedd601bcdbbec719f95b90862ebf433d7faa171801c29. 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/FR60Z1101060 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x786b3ccf42b67d5824969ba774db1e4e3ec59842697d1c39b4e4c320839ea0bf. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FR60Z1100960 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea1c1b32bc9acbbea9c23c411572db356145ee16dc5f7d754c45705004067d27. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/FR60Z1100840 — a six-check JSON result.