Tamar Halpern is a writer and director living in Los Angeles. She holds an M.F.A. degree from the University of Southern California's School of Cinematic Arts. Career Halpern has written and directe
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 0x07f246ead324a6850e32838bc542227b2b7062a30eaa19aa68f348f24658f02d. Chain 2 (Bitcoin): anchored in block 954031 (2026-06-17T01:43:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3b0dafc5-5f4c-494f-9fe7-67918ffd4efc.json and https://artists.proofprofile.net/proofs/artist/3b0dafc5-5f4c-494f-9fe7-67918ffd4efc.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.