KMMK may refer to: the ICAO code for Meriden Markham Municipal Airport, in Meriden, Connecticut, United States KMMK (FM), a radio station (88.7 FM) licensed to serve Coggon, Iowa, United States KM
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb65522e2a9181acf9871a75b25a04232ba057a36e7577781edc06e6fb67bcb1. Chain 2 (Bitcoin): anchored in block 953968 (2026-06-16T16:01:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/28b8e976-cd29-4e82-9117-ffa4464791a9.json and https://artists.proofprofile.net/proofs/artist/28b8e976-cd29-4e82-9117-ffa4464791a9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).