Bilyk () is a Ukrainian surname derived from a word meaning "white" (білий). It may refer to: Alfred Bilyk (1889–1939), Polish lawyer, military officer, and politician Catryna Bilyk (born 1959), Aust
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 0xea6f646e2933a9fa736dc759cf6de169608ec323fa43f98af7aa4f7be721e426. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c74bd9b3-8e02-4cc4-93f1-b36b7f411b36.json and https://artists.proofprofile.net/proofs/artist/c74bd9b3-8e02-4cc4-93f1-b36b7f411b36.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).