Ludo (; ) is a strategy-based board game for two to four players, in which the players race their four from start to finish according to the rolls of a single die. Ludo shares characteristics with ot
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 0x0f179f3d14c475e35abab052df815226e6b89498160f3e886aabfe5566e5d30d. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b344eb3f-2bb4-4c42-859f-167dcd212312.json and https://artists.proofprofile.net/proofs/artist/b344eb3f-2bb4-4c42-859f-167dcd212312.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).