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 0x580a4409d8d902abf9d24d1afdde5f3fc20e3c432cf1e93460635de60acd5356. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f1dddd6-1274-4afb-9152-e158352c6264.json and https://artists.proofprofile.net/proofs/artist/4f1dddd6-1274-4afb-9152-e158352c6264.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Schubert: 3 Klavierstucke D. 946, 4 Impromptus D. 899
Beethoven: Sonatas 14, 31 - Brahms: Piano Pieces, Op. 118 (Yamaha Piano Discovery)
Lieder ohne Worte, Op. 19b: No. 1 in E Minor, Andante con moto
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 0xfee2d597b117358d23864da251e98ee850baea9eae53c1457c97e30d2d10f1bd. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/ITK791930701 — a six-check JSON result.
Lieder ohne Worte, Op. 30: No. 6, Venetianisches Gondollied. Allegretto tranquillo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6749da1569745d41d829869135e4e4ef429df4e499973a70aedb36ea587ec81e. 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/ITK791930712 — a six-check JSON result.
Brahms: Piano Pieces, Scherzo & Ballades
4 Klavierstücke, Op. 119: No. 1, Intermezzo. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fefdb30940cc5b9d72b5d4c20c1aff88dbd2b61bb6e11846790c39da0507776. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITK791830407 — a six-check JSON result.
Johann Sebastian Bach: Die Kunst der Fuge, BWV 1080
Clavicembalisti italiani XVIII sec. Vol. 2
Sonata No. 4 in G Minor: II. Giga-presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84be903ee3e683d24deae12b4f2f409bf5c765afac4d485b040be187db4661f4. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ITK791327502 — a six-check JSON result.
Bach: Inventions, Sinfonia & Duets, BWV 772 - 805
Ettore Pozzoli: Allegro di concerto, Tema con variazioni
Sgambati: Concert for piano & Orchestra (& music by martini, corelli, gluck & respighi)
Concert for Piano and Orchestra in G Minor, Op. 15: Moderato Maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x273fa59a166592668560fe74beeb2155fc498b09a1ce9e9d57c2541d9bee43a3. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FR6V81290629 — a six-check JSON result.
Concert for Piano and Orchestra in G Minor, Op. 15: Romanza
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84c617e0d032407208f017be61884ac234680508c7405d9d79be82c1c072330e. 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/FR6V81290630 — a six-check JSON result.
Concert for Piano and Orchestra in G Minor, Op. 15: Allegro animato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d3d1a8a8078890d0135c7fadad2d67c3fbcaa760c0f673810a7b7bb873e79a5. 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/FR6V81290631 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3f13ca1db113a123a848f12419acade2482e7bee5b035a34d93bda5366e7283. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V81290632 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d428bf25581deaa0d848ba3a5b736b7bce0b07ca353a7d0f02f32879a4c080. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/FR6V81290633 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c6c009a1744567efaa51ceb959c7e91facd91974538bcf94dba9d35d6f4564. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FR6V81290634 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88a8e99d33143c40dba67549e6a104a4256a8914c9528d77553b8c2dbfa16ed. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR6V81290635 — a six-check JSON result.
Antiche danze e arie per liuto sec XVI - XVII, Free transcription for piano: Balletto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30959c34045acb6b5bd517cd0bb0c17ff0e9732028860e33bd7b46f87227b4b1. 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/FR6V81290636 — a six-check JSON result.
Antiche danze e arie per liuto sec XVI - XVII: Villanella
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa20c1d838159c8c95beb5fb58b061ec3bf3af35006876c946346f2fa3a124f. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V81290637 — a six-check JSON result.
Antiche danze e arie per liuto sec XVI - XVII: Gagliarda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6915e0b83036483a0015c3fc085f5c4743b706cdbfdcc062e1439633bb019708. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V81290638 — a six-check JSON result.
Antiche danze e arie per liuto sec XVI - XVII: Italiana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46fc8716ed9edbf76c386ce280f1f2b7e5aa32b0eb20293281383bb0f7ea1e9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V81290639 — a six-check JSON result.
Antiche danze e arie per liuto sec XVI - XVII: Passacaglia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88c69bdee0e1f7ede39edfc4905de238ab55b57103d6e4ac14fc5941981706d6. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/FR6V81290641 — a six-check JSON result.
I clavicembalisti italiani del XVIII secolo : Domenico Scarlatti, Francesco Durante, Domenico Cimarosa, Giambattista Martini, Baldassarre Galuppi, Antonio Gaetano Pampani, Domenico Zipoli, Be
Domenico Scarlatti: Sonata L366 / K1 in Re minore
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e673e344e044c8b0ebdf2ae12803931e1e96f2d3d89c68c49a33a2edab97a24. 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/ITK341022002 — a six-check JSON result.
Domenico Scarlatti: Sonata L335 / K55 in Sol maggiore
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8936d3b428ef227e2c787ab6cc3b77194d4d3beb456c8b7c7a3f293f9bb8fb. 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/ITK341022003 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x697d0bbd806d7300df006cc460a01a471a6af220e2d73b960f8f791c5fc2bc41. 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/ITK341022018 — a six-check JSON result.
Richard Strauss : Stimmungsbilder, Op. 9 - Modest Mussorgsky : Bilder einer Austellung - Luciano Chailly : Due istantanee, Variazioni nel sogno
Robert Schumann : Arabeske, Humoreske, Blumenstuck, Faschingsschwank aus Wien, Drei Stucklein aus bunte Blatter
Beethoven, Brahms, Balakirev, Borodine, Scriabine: Piano Works
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d757cafefb070ff79a9de39578ecd06c86b5d52c6443610e8304cc078cb54ef. 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/GX8KD2383021 — a six-check JSON result.
Queen Elisabeth Competition - Piano 2003 (Live)
Classical by the Sea, Vol. 1 (Relaxing Piano Chillout Essentials)