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 0x33770cb2a138a30fcab122f74b7ed11f3e589081536a51199376b6930dc7ed25. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a2e1a7b2-723d-461d-bbd4-fc749e33cde7.json and https://artists.proofprofile.net/proofs/artist/a2e1a7b2-723d-461d-bbd4-fc749e33cde7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Liebmann, Voříšek & Onslow: Works for Cello & Piano
Early 20th Century German Music for Cello & Piano
Music for Cello & Piano by Female Composers
Le Beau: Chamber Works for Cello, Viola & Piano?
4 Pieces for Cello & Piano, Op. 24: No. 4. Mazurka in A Minor: Lebhaft
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 0x9b04ec475e7107b73b6480fbfd4df39b62ee8b4a73bc3f3243ce839f1fd75af1. 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/DES808702420.
3 Pieces for Viola & Piano, Op. 26: No. 3. Polonaise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98666a357867e0d037ae1f12b8d5f9818271bf024676aada0b41c0a156d05e2b. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DES808702423.
Cello Sonata in D Major, Op. 17: III. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x764dd90f330c813f6f29c0a191db140647d219527da4fd0736b38a2f6221c325. 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/DES808702426.
4 Pieces for Cello & Piano, Op. 24: No. 1. Romanze in E Major: Massig bewegt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5f3e52dfed794d15cb310bef599164fe4f30b7a9494be80a9af6cb8c3ea68a2. 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/DES808702417.
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
4 Pieces for Cello & Piano, Op. 24: No. 2. Gavotte in A Minor: Nicht zu schnell
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35e2fe1f7e7887f5cf12f5eaef820ace128e6093bd3b90974c65388670f7d5b5. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/DES808702418.
4 Pieces for Cello & Piano, Op. 24: No. 3. Wiegenlied in G Major: Ruhig
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489142a795fc613fc4237395261b706c3454f419317f2bf35ef0bfd45bc414b1. 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/DES808702419.
Cello Sonata in D Major, Op. 17: I. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6e0d4b1f8d8e8381fabc534d6927fc74be676bb86d244adff2385075cb7bde9. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DES808702424.
Cello Sonata in D Major, Op. 17: II. Andante tranquillo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0852adb0f94623598d7a9b304e2f0cd849da504d9831c9d456735e8d544f62fd. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DES808702425.
Richard Franck: Piano Trio, Op. 20 & Op. 32
Eduard Franck & Richard Franck: Works for Violoncello and Piano
Eduard Franck, Richard Franck, Carl Reinecke: Werke Für Violoncello Und Klavier
Volkmann: Romanze in E Major, Op. 7 - Kirchner: 8 Pieces for Piano, Op. 79