Carter Hall can refer to: Carter Hall (Millwood, Virginia), the estate of Lt.Col. Nathaniel Burwell (1750–1814), now a conference center owned by Project Hope Two U.S. Navy ships have been named i
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 0x24d2d78afc0a5fc46dc300861c93dbb4a874b6be8bdcc658c107a89f896fdd91. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a89d97ee-7abc-4d4b-8760-47d9b83ccc30.json and https://artists.proofprofile.net/proofs/artist/a89d97ee-7abc-4d4b-8760-47d9b83ccc30.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).