Los Gringos is a 1999 animated short film created and written by Anders J. L. Beer & Rob Letterman, the latter of whom also directed the short. It was an official selection for the 2000 Sundance Film
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 0x282f352a255222a48125f39d58727de31f6eec01cd549adf8fb626d680a88df4. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4c90a84b-71b2-4ff4-9d33-97131a2004e0.json and https://artists.proofprofile.net/proofs/artist/4c90a84b-71b2-4ff4-9d33-97131a2004e0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).