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 0x7eafa4dc998cd74b147e4e4b9cc7c8e509f2b61e48d8f84c30762c2e030344cf. Chain 2 (Bitcoin): anchored in block 953867 (2026-06-16T01:09:47Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0505fc91-8b4b-4eda-a15e-3543b1d0fdc4.json and https://artists.proofprofile.net/proofs/artist/0505fc91-8b4b-4eda-a15e-3543b1d0fdc4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
I colori dell'organo: Italian Rare Organ Works
An Italian Organ Journey: Province of Brescia
An Italian Organ Journey: Province of Lecco
The Organ in Lombardy: Organist and Choirmaster Between the XVI and the XVIII Century
Organi e Organisti nell'800 lombardo (Alla scoperta degli antichi organi della bassa valtellina)
An Italian Organ Journey - Province of Como
An Italian Organ Journey - Province of Lecco
An Italian Organ Journey - Province of Brescia
I Colori Dell'organo - Italian Rare Organ Works