Paul Jimmy Thörnfeldt (born 14 March 1976), also known professionally as Jimmy Joker or simply Joker, is a Swedish songwriter and record producer. As a songwriter, he has taken part in Melodifestivale
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 0x41db2bfa101fa32ab2308d206b8464f780ced9c4021b51d92d475068db7d5536. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/06345c9a-cd6b-4c00-aa57-d961718a0c33.json and https://artists.proofprofile.net/proofs/artist/06345c9a-cd6b-4c00-aa57-d961718a0c33.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).