thumb|During his solo triple circumnavigation of the globe in 1987, Jon Sanders pauses off Fremantle to receive fan mail Jon Sanders (born 1939Jon Sanders was sixty six in 2005 in Perth, Western Aust
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 0x9f1064e19b27ba16af0189a8aee54bd3f768d6392244e3cbd4782562c7207a76. Chain 2 (Bitcoin): anchored in block 954062 (2026-06-17T07:39:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/45c4214d-38d1-4126-8ebc-91e634398620.json and https://artists.proofprofile.net/proofs/artist/45c4214d-38d1-4126-8ebc-91e634398620.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.