JMR may refer to: Japan Media Review, an English academic online journal dedicated to the Japanese press Jean Marie River, in Northwest Territories, Canada Jelle's Marble Runs, a YouTube channel J
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 0x4380a650808a0186cd09429b9de05dad94255e839065bc46c63e2d24f5e0e369. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8cab1227-59c2-4f2e-b060-19c681227710.json and https://artists.proofprofile.net/proofs/artist/8cab1227-59c2-4f2e-b060-19c681227710.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).