thumb|Antonio Sacchini Antonio Maria Gasparo Gioacchino Sacchini (14 June 1730 – 6 October 1786) was an Italian classical era composer, best known for his operas. Sacchini was born in Florence, but
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 0x4e89cbdc2aa12f727b99bbb7ca2d7503d20782950934ac291569f0a605da7ff7. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ac1dacd5-e560-4d59-b343-81ac7eeecf6d.json and https://artists.proofprofile.net/proofs/artist/ac1dacd5-e560-4d59-b343-81ac7eeecf6d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sacchini: L'abbandono delle richezze di S. Filippo Neri (D. Hauk, F. Hauk & M. Hößl Critical Edition)