Jonathan Hyung-joon Kim (; born 1960) is a South Korean film producer. He has produced five of the country's top 50 highest-grossing films of all time, including Silmido, the first film to surpass 10
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 0x09d0bb8ae8ff67d51d89b0e57c0aa8ba28dad9f03ff58e7704270b7bc1b8f752. 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/8c08bfe9-62cc-4701-905b-9851101c0fcf.json and https://artists.proofprofile.net/proofs/artist/8c08bfe9-62cc-4701-905b-9851101c0fcf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).