David Duvall Orr (born October 4, 1944) is an American Democratic politician who served as the Cook County Clerk from 1990 to 2018. Orr previously served as alderman for the 49th ward in Chicago City
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 0xf36c077458ab40b64f6dfc7fa1f0b1f833e189fb61632fccb438f68b3a4112e7. Chain 2 (Bitcoin): anchored in block 954689 (2026-06-21T10:35:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e373ffce-e39a-47a8-9c28-c786681fccb4.json and https://artists.proofprofile.net/proofs/artist/e373ffce-e39a-47a8-9c28-c786681fccb4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).