Park Ji-hoon (; born March 14, 2000), known mononymously as Jihoon, is a South Korean singer. He debuted in Treasure on August 7, 2020, and its single album entitled The First Step: Chapter One. Lif
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 0x0c06e8b31bb52f0c94ae9ef7526adca6a8d7849aa1eb37cf55d768bcfc965a4f. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fd55658d-7493-4091-819a-0a1f89e225cd.json and https://artists.proofprofile.net/proofs/artist/fd55658d-7493-4091-819a-0a1f89e225cd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).