Legends of Runeterra (LoR) is a 2020 digital collectible card game developed and published by Riot Games. Inspired by the physical collectible card game Magic: The Gathering, the developers sought to
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 0x70c949e25052d4d08bbb16b0a02eb4443e35dc7486f163bec4356c44c25658b5. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df63c8e7-2ad2-4b0c-a35c-1dc30854d8a6.json and https://artists.proofprofile.net/proofs/artist/df63c8e7-2ad2-4b0c-a35c-1dc30854d8a6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Unstoppable (Legends of Runeterra Version)