"Big Iron" is a Western ballad song written and performed by Marty Robbins. Originally released as an album track on Gunfighter Ballads and Trail Songs in September 1959, it was released as a single
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 0xac3e7506370da00c9e2f02cff97cab90dd38a9b2782f5a4609e02aae0b6c91f8. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a193576b-cf25-492e-8de2-53961a57181c.json and https://artists.proofprofile.net/proofs/artist/a193576b-cf25-492e-8de2-53961a57181c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).