Lim Jae-beom (; born January 6, 1994), known professionally as Jay B (; stylized in all caps), and formerly JB, is a South Korean singer, songwriter, and actor. Jay B is the leader of South Korean boy
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 0xd816419e5d2f4ab9ccd973adc6822a7b7d31c95f86dfe835fb8cb857f4edbb6d. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b8af0045-b63b-4f0e-aecf-b1ebfb3578ad.json and https://artists.proofprofile.net/proofs/artist/b8af0045-b63b-4f0e-aecf-b1ebfb3578ad.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).