Jacob Hall (fl. 1668) was an English rope-dancer, who distinguished himself as a performer on the tight-rope. thumb|Jacob Hall (traditional attribution). Career The memoirs of Philibert de Gramont in
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 0xed2566cd0e1d4169ddeb6199b2eb186e393ca7a2636dc006dbc33f6e7edceec5. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9d3672d0-7891-4c35-91f5-7b4eaff18466.json and https://artists.proofprofile.net/proofs/artist/9d3672d0-7891-4c35-91f5-7b4eaff18466.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).