thumb|upright=1.2|A John Frum gathering area John Frum (also called Jon Frum, John Brum, and John Prum) is a figure associated with cargo cults on the island of Tanna in Vanuatu (formerly the New Heb
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 0x8d7a6254efd4ad43b5e71f2e48077f01f6436c5b3c77db94c4fd3264f1dbf5fa. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a72808f6-5c1f-49e3-b484-a2d003f3c622.json and https://artists.proofprofile.net/proofs/artist/a72808f6-5c1f-49e3-b484-a2d003f3c622.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).