The Four Postmen are an American rock band from Los Angeles, consisting of Ken Weiler (electric guitar, vocals), Matt Kaminsky (vocals, keyboards), Stefan Marks (acoustic guitar, vocals), Geoff Dunbar
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 0x5e71e9e9bf80e2e881c683a38fea200bdc844b9ff1abe8fe34b1c018fe75bff3. 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/62967232-f2ff-4bc4-8d61-8c3a7cf30fb4.json and https://artists.proofprofile.net/proofs/artist/62967232-f2ff-4bc4-8d61-8c3a7cf30fb4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).