David Auburn (born November 30, 1969) is an American playwright, screenwriter, and theatre director. He is best known for his 2000 play Proof, which won the 2001 Tony Award for Best Play and Pulitzer
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 0xbf7bd48b97b944e5b1c1aeb92f7a1a0dddba4d6790279d170298000aef8351a3. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/62dbfe5a-e288-41c9-960f-00ea099db084.json and https://artists.proofprofile.net/proofs/artist/62dbfe5a-e288-41c9-960f-00ea099db084.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).