El Che may refer to: Che Guevara (1928-1967), an Argentine Marxist revolutionary Cheteshwar Pujara (1988-), an Indian Test Cricket Batsman El Che (album), a 2010 album by Rhymefest
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bf7b20c9b048fa59b15de602bfc3f320eacdb07c9f441638863cc6e73fb22bd. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/86ecd75c-4c7f-4e70-8de8-9dc9bd5724dc.json and https://artists.proofprofile.net/proofs/artist/86ecd75c-4c7f-4e70-8de8-9dc9bd5724dc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).