Sá is a Portuguese and Galician surname, derived from places in Portugal and Galicia named Sá or Sa. People Alfredo de Sá, Portuguese politician and Prime Minister during the First Republic André Sá,
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 0x6dff8ac581323c454d54300168ab0e7b422a573bb9721ec586ab86cb5be3faa9. 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/85588a06-069f-4e58-a626-c02308f8fd1f.json and https://artists.proofprofile.net/proofs/artist/85588a06-069f-4e58-a626-c02308f8fd1f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).