KHAK (98.1 FM) is a radio station that broadcasts a country music format to the Cedar Rapids–Iowa City, Iowa area. Licensed to Cedar Rapids, the station is currently owned by Townsquare Media. KHAK's
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 0xc7cb1258e8336c089082a0947015156c0b6edd2c6aba9e0bba0da2d4bb7ede20. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7cdd55a-65b2-4c68-875b-1fccd8cb90db.json and https://artists.proofprofile.net/proofs/artist/d7cdd55a-65b2-4c68-875b-1fccd8cb90db.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).