thumb|upright=1.75|Chariot races, as depicted on this 2nd-century relief, were among the ludi presented at Roman religious festivals Ludi (Latin for "games"; plural of ludus) were public games held fo
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 0x3f7649d007d328d59787d3f2c75f9e6d1a1d883c89a36db9d5dda346628cc9b2. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f396be96-1abe-473d-a0f0-bdefa55b7378.json and https://artists.proofprofile.net/proofs/artist/f396be96-1abe-473d-a0f0-bdefa55b7378.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
RuneScape: The Essential Free to Play Classics