Soham ( ) is a town and civil parish in the district of East Cambridgeshire, in Cambridgeshire, England, just off the A142 between Ely and Newmarket. Its population was 12,336 at the 2021 census. His
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 0xbb6df8f85100fc6bc24dfece209b690f949c80d287543adfe1e4389208f65272. Chain 2 (Bitcoin): anchored in block 953736 (2026-06-15T03:21:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/98363400-a27e-404c-9c3e-36cf2db212e5.json and https://artists.proofprofile.net/proofs/artist/98363400-a27e-404c-9c3e-36cf2db212e5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).