thumb|View of the Entrance to the Arsenal, by Canaletto, 1732 thumb|Cannons and mortars of Napoleon's army exhibited along the wall of the Kremlin Arsenal thumb|The Royal Armoury, Leeds thumb|Armory
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 0xb6f9c3a7f5d29752ab1d69a410379986dd3fc8cd83a0c098505a77b11636a995. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9de4598f-12bf-4815-afcc-dfba565a54ba.json and https://artists.proofprofile.net/proofs/artist/9de4598f-12bf-4815-afcc-dfba565a54ba.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).