KOLD or Kold may refer to: KOLD-FM, a radio station (91.9 FM) licensed to serve Cold Bay, Alaska, United States; see List of radio stations in Alaska KOLD-TV, a television station (PSIP channel 13/
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 0xe6023443e3a77bea07efe3eb0244df5b843cfe1fb91327f8c7b4f9df250006b6. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5c43575a-cc62-4065-ac33-2ccefb996907.json and https://artists.proofprofile.net/proofs/artist/5c43575a-cc62-4065-ac33-2ccefb996907.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).