KK, K.K., kK, k.k., or other sequences of two k's with or without punctuation may refer to: Arts and media KK, the production code for the 1967 Doctor Who serial The Faceless Ones "KK" (song), a 201
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 0x45e6bf632ee0d99e6442c73d6c6506942613b84fb30c114b69aad4a3ce2356b9. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aa15f4bd-b830-4410-83a7-6dce68df29b9.json and https://artists.proofprofile.net/proofs/artist/aa15f4bd-b830-4410-83a7-6dce68df29b9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).