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 0x28dac9098a6e07d37b2c3dba11d533a9761cb0ce24d058785bab193d87e2dd53. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/21e682de-5c76-44b5-a271-748a3963f591.json and https://artists.proofprofile.net/proofs/artist/21e682de-5c76-44b5-a271-748a3963f591.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Weinberg / Weprik / Shostakovich: Piano Trios
Shostakovich, D.: Aphorisms / Weinberg, M.: Children's Notebooks / Nemtsov, S.: 20 Sketches
The Krein Family: World Premiere Recordings
Shostakovich, D.: 24 Preludes / Zaderatsky, V.P.: 24 Preludes
Wolfsohn, J.: Jewish Rhapsody / Hebrew Suite / Paraphrases On Old Jewish Folk Songs / Liszt, F.: Hungarian Rhapsodies
Geringas, David / Nemtsov, Jascha: Eli Zion - From St. Petersburg To Jerusalem
Schneiderman, Helene / Nemtsov, Jascha: On Wings of Jewish Songs
Raff: Works for Violin and Piano, Vol. 2
Raff: Works for Violin and Piano, Vol. 1
Meyer / Nemtsov: Jewish Songs Without Words
Bernhard Sekles: Fanasietten Op.42 - Andantino