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 0xf795adcd3f432f75dddb9db9821102d2a633be3f4d9a60e64ddbb0ff46fab7ac. 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/3ff31038-4c86-4704-b8cf-c8823eab25f0.json and https://artists.proofprofile.net/proofs/artist/3ff31038-4c86-4704-b8cf-c8823eab25f0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Four Seasons: Violin Concerto in E Major, Op. 8, No. 1, Rv 269, "la primavera" (Spring): Ii. Largo e pianissimo sempre
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 0x073e3744752c3525aec5d92b1a50a5fed6d5a94afef632a23b2b1a2210ede1e1. 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/HKI199329402.
Cello Concerto in C Minor, Rv 401: Ii. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae8a41830b2a95ec37db743e28209835284fcf7fa45b7146c71ecaa13aa915f. 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/HKI199328111.
Concerto for 2 Oboes in C Major, RV 534: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf36ac7e154e95dbbc99c1382a3dd5287865baad25f0a1cc45feb6fa339a4391c. 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/HKI199329005.
Mosonyi, M.: Piano Trio / Grand Nocturne
A Guided Tour of the Baroque Era, Vol. 4
Donizetti: Double Concerto / Flute Concertino / Clarinet Concertino
Sinfonia a soli instrumenti di fiato in G Minor: Andante (recon. B. Pauler)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4161bbd10886ef8a36ae0edd132875daf99a3bfb2799294abcc55062252bbfa. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190448501.
Flute Sonata (Concertino) in C Minor: Largo - Allegro (orch. W. Hoffmann)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x121c54ab11b5aed52514890e2011db27bce6880293910c05ebbb2e23814d9c78. 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/HKI190448502.
Oboe Sonata in F Major (arr. W. Hoffmann): I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e34fa9ed167586253da18d55274796b7bf612f298acc5e1b2e64b4857ff9bbb. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/HKI190448503.
Oboe Sonata in F Major (arr. W. Hoffmann): II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb57e885c41f15a206f6e20cc1ea25433a5bc2ebe3eb56dcb0b4c9cafc22123e8. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/HKI190448504.
Concerto for Violin and Cello in D Minor (recon. J. Wojciechowski): I. Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa1edc908784c978a5cda7d9174fe365e43f33a9562f2b5db6e8b3458286ce4b. 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/HKI190448505.
Concerto for Violin and Cello in D Minor (recon. J. Wojciechowski): II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1523a3c56fdac4ed0089a420d7415153a8313755c7c72211b96caff70a37cea7. 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/HKI190448506.
Concerto for Violin and Cello in D Minor (recon. J. Wojciechowski): III. Rondo (Allegro moderato)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6acb77eb927e84b489772cfeecfc94374ccfbfb293c502e31b830d23d3a7f7a5. 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/HKI190448507.
Cor Anglais Concertino in G Major: Andante con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8834afd0c235c92b537843d5cc77b93574cd02f18013aa70e6e5f5676c75e6f. 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/HKI190448508.
Clarinet Concerto in B-Flat Major (reconstructed R. Meylan): I. Andante sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81196dc05a976e89b61ffb2adcd370bc896a655b56d6eb71bd60e3371923ebe8. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/HKI190448509.
Clarinet Concerto in B-Flat Major (reconstructed R. Meylan): II. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d1723941dcfbd245d5f08c92e7ef9b0dbfe05cc00ce7473b8fb4f639e3f9231. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/HKI190448510.
Liebesleid - Classical Favourites for Relaxing and Dreaming
Kosa, G.: In Praise of Creation / Mocking / A Refutation of Transitoriness / Afterlife / Happy Nonsense (Home Concert)