thumb|The Cannon Shot (1670) by Willem van de Velde the Younger, showing a late Dutch 17th-century ship of the line A warship or combatant ship is a naval ship that is used for naval warfare. Usually
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 0x3eba4e0382bc639909a376e139476651470342185744f6150b7d33a8a461f04d. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2e5fa91f-4be3-49b5-8be1-2070d3bc181f.json and https://artists.proofprofile.net/proofs/artist/2e5fa91f-4be3-49b5-8be1-2070d3bc181f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).