Sergey Nikolayevich Filippov (, 24 June 1912 — 19 April 1990) was a Soviet and Russian film and stage actor and comedian, best known for his parts in films Adventures of Korzinkina (1941), The Night P
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 0x577d7cf44b5b6e90952f2920274040eaa9320120cc20d461d4866d2c4146469f. Chain 2 (Bitcoin): anchored in block 953704 (2026-06-14T22:58:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7857c6f5-c136-4eaf-87db-d55164de892d.json and https://artists.proofprofile.net/proofs/artist/7857c6f5-c136-4eaf-87db-d55164de892d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).