Evgeny Starodubtsev (born 1981) is a Russian pianist. He studied with Natalia Trull at the Moscow Conservatory. He was a 2009 laureate of the Honens International Piano Competition, and won the Ciurl
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 0xd4469805cd6f1f1273a6f4080a62c36e4dc50a3c1d27a103fd87f1c59bc4bed7. Chain 2 (Bitcoin): anchored in block 953973 (2026-06-16T16:37:07Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a732fff-f5ab-4c29-8ceb-c8b96f0afc61.json and https://artists.proofprofile.net/proofs/artist/2a732fff-f5ab-4c29-8ceb-c8b96f0afc61.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
COMPLETE RECORDINGS OF SAMUEL FEINBERG’S WORKS. Vol. 2 Piano Sonatas Nos. 4 – 8 Evgeny Starodubtsev, piano
Honens Laureate Series: Hindemith Schoenberg Stravinsky Szymanowski