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 0xb0ee65b80962ceb10ab7119a02e0dcca379c513a07e6659f7a1aed157d171acb. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e528ea95-91be-4a03-b892-0be370c73213.json and https://artists.proofprofile.net/proofs/artist/e528ea95-91be-4a03-b892-0be370c73213.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).