John Mermis (born ), known as Long Gone John, is an American entrepreneur best known for his record label, Sympathy for the Record Industry, and his vinyl toy company, Necessaries Toy Foundation. He
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 0x69411dfefb1d1249e4b04d0719957076d06562a2f3f343c75667ce90972fbb91. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ea30f86d-6ca4-4e50-9885-25c73b124bc2.json and https://artists.proofprofile.net/proofs/artist/ea30f86d-6ca4-4e50-9885-25c73b124bc2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).