John & Mary is a United States–based folk rock duo featuring John Lombardo and Mary Ramsey both members of alternative rock band 10,000 Maniacs. History 1989–1993 John & Mary was formed by John Lomba
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 0x2c0003d3339253c92b846a4083e328289e87286bc693190d4d3fe8e8b147690f. Chain 2 (Bitcoin): anchored in block 953899 (2026-06-16T06:37:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/12e2b356-2c2c-4d93-ac55-c49ea1a2b769.json and https://artists.proofprofile.net/proofs/artist/12e2b356-2c2c-4d93-ac55-c49ea1a2b769.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).