Sacco is a surname which may refer to: Albert Sacco (born 1949), American chemical engineer and astronaut Andreina Sacco (1904–1988), Italian multi-sport track-and-field athlete Angelo Sacco (died
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 0x81c19f98381f0ee8b913e616f9488464118e76ba0cbae780c51977812eb076f6. Chain 2 (Bitcoin): anchored in block 953968 (2026-06-16T16:01:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/287f077e-b78d-4ca2-9326-5a2ba77b38bf.json and https://artists.proofprofile.net/proofs/artist/287f077e-b78d-4ca2-9326-5a2ba77b38bf.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).