Osvaldo Peredo Leigue (also Osvaldo Peredo Leigh, nom de guerre: Chato) (1941 – 12 January 2021) was a Bolivian communist militant and physician. He lived in Santa Cruz de la Sierra, Bolivia, where he
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 0xa0e7fa7ca64b9ddaf4a6dd4887ac97d32bb052cd57066f2f6ebdc9c946ced53b. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6d594846-b397-4d8f-91dd-12acc3196572.json and https://artists.proofprofile.net/proofs/artist/6d594846-b397-4d8f-91dd-12acc3196572.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).