Kel or KEL may refer to: Raquel Calderón (born 1991), Chilean singer and actress Kei Lun stop, Hong Kong, MTR station code KEL Kel, Azad Kashmir, village in Neelam Valley, Azad Kashmir, Pakistan
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 0x4337521543b65a86ab0d5655f5b3ab952ffa7d515ee74fbde03e2f01c675051f. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dc6890c2-1a94-4b29-91d7-64be5e22df27.json and https://artists.proofprofile.net/proofs/artist/dc6890c2-1a94-4b29-91d7-64be5e22df27.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).