Jacobs may refer to: Businesses and organisations Jacob's, a brand name for several lines of biscuits and crackers in Ireland and the UK Jacobs (coffee), a German brand of coffee Jacobs Solutions, a
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 0x3787d257f2bbafc8a7cf06c8e8d04e5936700e0b70ff0a55cf038f3f9caa5af9. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cd80a96a-1cac-453d-8eb2-0921fe792a5c.json and https://artists.proofprofile.net/proofs/artist/cd80a96a-1cac-453d-8eb2-0921fe792a5c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).