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 0x18755ab8fc8be3b76db69768f99b2b831c1f4909fafbdc6482c78ee0916032bb. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cd644a8b-090e-4059-ae93-bcca011ea23a.json and https://artists.proofprofile.net/proofs/artist/cd644a8b-090e-4059-ae93-bcca011ea23a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Boccadoro / Cantata Su Melodie Yiddish / L'Astrolabio Del Mare / Aisha - L'Orso e Il Miele
Carlo Boccadoro: Racconti di ieri - Cantata su melodie yiddish
Carlo Boccadoro: SHI (Si faccia) [Opera da camera in un atto e 5 scene]