thumb|Vasily Zaytsev, left, and other Soviet snipers equipped with Mosin–Nagant M1891/30 during the Battle of Stalingrad in December 1942 thumb|A modern sniper weapon system which consists of a sniper
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 0x661a6c660122317374634e9fed264efd410d618105150b23fd09c9e3aea92d3c. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d1afe8b6-2f74-4eba-b535-c93ddd9a91f7.json and https://artists.proofprofile.net/proofs/artist/d1afe8b6-2f74-4eba-b535-c93ddd9a91f7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).