McCarthy Trenching is a band from Omaha, Nebraska led by Dan McCarthy. The band has opened for other acts such as Bright Eyes. In 2013 the McCarthy Trenching song "A Keg of Beer and an Accordion" was
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 0x3b4015ff64ae780d45c5e1b1145fddbe291194e4e2c265e45720d1d31c433c81. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/add09d88-9e68-4ccb-944d-b9532c2388ef.json and https://artists.proofprofile.net/proofs/artist/add09d88-9e68-4ccb-944d-b9532c2388ef.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).