thumb|Percy Ingle shop in Walthamstow, East London Percy Ingle was a retail bakery founded in east London in 1954, by Percy Ingle. The chain had over 50 outlets in London and Essex. As of 2010, Micha
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 0xad7c9c451a0087d5906ce2b649c5174e45d4c59ff00a6a656ba84868f1b5694f. Chain 2 (Bitcoin): anchored in block 953768 (2026-06-15T09:30:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c0b2afad-79c3-497a-94c6-63cc3300dea8.json and https://artists.proofprofile.net/proofs/artist/c0b2afad-79c3-497a-94c6-63cc3300dea8.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.