Nikolay Dmitriyevich Kashkin (; 15 March 1920) was a Russian music critic as well as a professor of piano and music theory at the Moscow Conservatory for 33 years (1866–96 and 1905–08). The son of a
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 0x0cf99b9feb07360e1cb6a2e7f96866fd4b013b1f1c99cdf4d190b347e6e1b5ba. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/94422d1d-55fe-493d-a5f6-4b08abdd4925.json and https://artists.proofprofile.net/proofs/artist/94422d1d-55fe-493d-a5f6-4b08abdd4925.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).