CJM or cjm can refer to: Canadian Journal of Mathematics Convent of Jesus and Mary, a network of Roman Catholic schools around the world Colegio Japonés de Madrid, a Japanese international school
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 0xaa8357ba21f55a7d9b29da8990cb86b73771b9b0fcd9b557888a4e924c5803a8. Chain 2 (Bitcoin): anchored in block 954588 (2026-06-20T19:15:05Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ba47a265-0705-4b73-b363-07a3f91798ac.json and https://artists.proofprofile.net/proofs/artist/ba47a265-0705-4b73-b363-07a3f91798ac.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).