Guillermo Álvarez may refer to: Guillermo Álvarez Macías (1919–1979), Mexican cooperative activist and general manager of Cemento Cruz Azul Guillermo Álvarez (baseball) (1926–2007), Mexican baseball
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 0x8b04ba85a45f623c5ba19c9f8836f93713104eaa06d281b850a83112f7d07a95. Chain 2 (Bitcoin): anchored in block 954580 (2026-06-20T17:48:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b61c7726-7a3b-47b9-a2e6-2be81105575e.json and https://artists.proofprofile.net/proofs/artist/b61c7726-7a3b-47b9-a2e6-2be81105575e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).