Alan Mandell (born Albert Mandell on 27 December 1927) is a Canadian-American actor known for playing Rabbi Marshak in the Coen Brothers' 2009 film A Serious Man. With several decades of experience as
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 0xb788aa32cc2439701411a87de54e281af6421bb30173ef28b1a17cace1192d4f. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d97c1fea-f4fd-4cec-8a70-dc5255590ca5.json and https://artists.proofprofile.net/proofs/artist/d97c1fea-f4fd-4cec-8a70-dc5255590ca5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).