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 0x1e82c1e1dc19ce9540f03d4488099a12bb904a24e11e84c25b2385e74accb143. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2658eccd-dfea-4776-a07c-5c1e6b4027e6.json and https://artists.proofprofile.net/proofs/artist/2658eccd-dfea-4776-a07c-5c1e6b4027e6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Chamber Music (Romantic 19Th Century) - Schubert, F. / Weber, C.M. Von / Spohr, L. / Brahms, J. / Grieg, E. / Schumann, R. / Boccherini, L.
String Quintet in E Major, Op. 11, No. 5, G. 275: III. Minuetto
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 0x5d24523caab1bb531afcb45e2a3b8c5791b3a65e0e794126eb4b53dd440fb924. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US2TL0926401.
The 4 Seasons: Violin Concerto in F Minor, Op. 8, No. 4, RV 297, "L'inverno" (Winter): II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d522c34918dabb10390df9b65b816b9b47f28452a8fc30495a0249c4b8a2291. 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/HUA250100514.
The History of Guitar (100 Famous Songs)
Kosa: De Profundis / I Call You, Swan / Todesfuge / Cantata / Chinese Songs
Beethoven: String Quartet Op. 95 and String Trio Op. 3
Schubert: Piano Trio in B Flat Major - Notturno
Vivaldi, Geminiani: Guitar Concertos and Sonatas
The History of Schubert (100 Famous Songs)
Trio Divertimento in E Flat Major K. 563 - Duos K. 423 and 424
Horusitzky: North / The Power of Music / Cello Sonata / Songs