is a beat 'em up video game series originally developed and published by Technōs Japan. It began with the release of the arcade game Double Dragon in 1987. The series features twin martial artists, B
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 0x1f824fa39979297a3c712e3293a90d180d186fc126af5430addea66058a3f9c2. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a1d0d835-3a2c-4289-92b1-d15167d09f30.json and https://artists.proofprofile.net/proofs/artist/a1d0d835-3a2c-4289-92b1-d15167d09f30.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).