Grechko is a surname. Notable people with the surname include: Andrei Grechko (1903–1976), Soviet general, Marshal of the Soviet Union, Minister of Defense Georgy Grechko (1931–2017), Soviet cosmonau
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 0xaab3215a39d35443a84ce8310cdf48fcad562892601fdcea8972bcd02a88bfcf. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb02aeea-b12a-4e3f-8641-30303d071223.json and https://artists.proofprofile.net/proofs/artist/cb02aeea-b12a-4e3f-8641-30303d071223.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).