Sastre (which means tailor in Spanish) is a surname. Notable people with the surname include: Alfonso Sastre (1926–2021), Spanish playwright Antonio Sastre, (1911–1987), Argentinian footballer Car
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 0x5d41d87e9dfe3e2ce15c84b672d5a164176d71076783111b6ce1e4faff147e22. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ba7d9ed3-0d39-4251-9df6-257e59bd3c0d.json and https://artists.proofprofile.net/proofs/artist/ba7d9ed3-0d39-4251-9df6-257e59bd3c0d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).