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 0x5cb70749de2dfbd13ad6b69ee5122b4ab080c65e77f6aab1dbc7519ed1828cd9. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6d5452c7-3913-4d47-9b28-cdd0f5625c2a.json and https://artists.proofprofile.net/proofs/artist/6d5452c7-3913-4d47-9b28-cdd0f5625c2a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Russian Piano School. Samuel Feinberg (CD3)
Russian Piano School. Samuel Feinberg (CD4)
Russian Piano School. Samuel Feinberg (CD1)
Russian Piano School. Samuel Feinberg (CD2)
Samuel Feinberg - First Recordings: 1929-48
Beethoven & Feinberg: Piano Works (Remastered 2024)
Golden Classics. Bach - The Well-Tempered Clavier - vol.2 (CD2)
Golden Classics. Bach - The Well-Tempered Clavier - vol.1 (CD2)
Golden Classics. Bach - The Well-Tempered Clavier - vol.1 (CD1)
Golden Classics. Bach - The Well-Tempered Clavier - vol.2 (CD1)
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 0x826e4780e2df8f7b8371221f949264bd40c2b4b4b5eb7c9503fe58112108d081. 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/SEAEO0313070.
Samuil Feinberg: In Sound And Thought (Moscow, 1948-1962)
The art of Samuel Feinberg, vol II. Beethoven. Sonatas no.4, 11, 30
Samuil Feinberg - Sonatas for violin and piano
COMPLETE RECORDINGS OF SAMUEL FEINBERG’S WORKS. Vol. 2 Piano Sonatas Nos. 4 – 8 Evgeny Starodubtsev, piano
Samuil Feinberg - Sonata No. 1, Op. 1 (1915)