thumb|Icon of Our Lady of Kazan covered with a gilded silver riza. thumb|Riza removed from its icon. A riza (Russian: риза, "vestment," "robe"; Ukrainian: шати, shaty, "vestments") or oklad (оклад, "
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 0x8dceb8dedbb9a1c87cb7eb401ad5cd23767a72b5b129e9613fc3817598963b1a. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b050c1db-550a-4a43-9fa6-ce6451c21975.json and https://artists.proofprofile.net/proofs/artist/b050c1db-550a-4a43-9fa6-ce6451c21975.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).