thumb|Caesars Palace, a popular casino which opened in 1966 on the Las Vegas Strip A casino is a facility for gambling. Casinos are often built near or combined with hotels, resorts, restaurants, ret
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 0x28ea821b22293308ae8744a467c4f80a3b17cf1a25bed36410fe31a7097b27e0. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a7ab22b4-80f3-4206-a3b3-afc42f3f127c.json and https://artists.proofprofile.net/proofs/artist/a7ab22b4-80f3-4206-a3b3-afc42f3f127c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).