MDK is a 1997 third-person shooter video game developed by Shiny Entertainment for Windows and subsequently ported to Mac OS by Shokwave, and to the PlayStation by Neversoft. The game was published on
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 0x0fc8786f931924ca2ad6e37a8cf699e03dc334ba75c2ad471713a8e61e491d08. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f02dc963-7563-416a-98c0-4ee0206df190.json and https://artists.proofprofile.net/proofs/artist/f02dc963-7563-416a-98c0-4ee0206df190.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).