Jem or JEM may refer to: Arts, entertainment and media Film and television Jem (TV series), or Jem and the Holograms, an American 1980s animated TV series Jerrica "Jem" Benton, protagonist of Jem (
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 0x594f200e1aaa5843e8c815880a29b2b70cd7c6d27db5b2620898e6ec6f587efe. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f127195b-d398-4603-a488-1623682abf67.json and https://artists.proofprofile.net/proofs/artist/f127195b-d398-4603-a488-1623682abf67.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).