Michael Cristofer (born January 22, 1945) is an American actor, playwright, and filmmaker. He received the Pulitzer Prize for Drama and the Tony Award for Best Play for The Shadow Box in 1977. From 20
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 0x0cec71369a9b62bbd601057cb748d7fff568d8cc896d724d4ecfb250958ebeaa. Chain 2 (Bitcoin): anchored in block 954555 (2026-06-20T12:10:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ae4f6142-7d15-4727-8ee0-14400c2c70c9.json and https://artists.proofprofile.net/proofs/artist/ae4f6142-7d15-4727-8ee0-14400c2c70c9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).