Zarza can be: Zarza la Mayor, municipality located in the province of Cáceres, Extremadura, Spain Zarza de Tajo, municipality in Cuenca, Castile-La Mancha, Spain Zarza de Montánchez, municipality
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 0xc1eafbd1d4697436bafc375a827e69123cdafd7e797ef0dbdc1c90224388575c. Chain 2 (Bitcoin): anchored in block 954139 (2026-06-17T21:12:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7f866371-12aa-4cc4-9b25-9c8c6bb31966.json and https://artists.proofprofile.net/proofs/artist/7f866371-12aa-4cc4-9b25-9c8c6bb31966.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).