JK may refer to: People Jay Kay (Jason Luís Cheetham, born 1969), English musician and lead singer of Jamiroquai Jaykae (Janum Khan, born 1991), English rapper and actor JK-47 (Jacob Paulson, born 19
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 0xa0b28cdc8611f3ae4f2dd531d8e0a71cb0d66b834977f3396dcff628dda5bc93. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f1280004-464f-4a12-81de-10d500d600eb.json and https://artists.proofprofile.net/proofs/artist/f1280004-464f-4a12-81de-10d500d600eb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).