Ambrogio Maestri (born 1970) is an Italian operatic baritone. He is especially known for his portrayal of the title character in Giuseppe Verdi's Falstaff. He studied piano and singing in his home tow
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 0xac401c55345efc31f03a7f87250f6509324f37fe88e6441e74a80b2de4348c04. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fcb33bb1-99b1-410c-b8af-23fce756e100.json and https://artists.proofprofile.net/proofs/artist/fcb33bb1-99b1-410c-b8af-23fce756e100.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Aida / Act 2: "Che veggo!...Egli?...Mio padre!"
Orchestra del Maggio Musicale Fiorentino
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0x3ccba609c3cf2fc90f4021547f579c528138369788d231dd8c7a1112899ddcdd. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITZ041600031 — a six-check JSON result.
Aida / Act 2: "Quest'assisa ch'io vesto vi dica"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac86a95beae77b020cb534875eeefcc29462e4f22911abb076d79b3009ada2f2. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITZ041600032 — a six-check JSON result.
Aida / Act 2: "Ma tu, Re, tu signore possente"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41e63e4d3d4448a18e12e33f23e7e1c8062739b7832230da215a6b38b504c448. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITZ041600033 — a six-check JSON result.
Aida / Act 2: "Gloria all'Egitto, ad Iside"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1cf717564a7c2c7f45a1a72d290cddb2c8d8fa7d0428474f61489dc6147e360. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITZ041600035 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6389473bcf96df0754824a14b42baa00230b31467352aeefe49d3cef5b92bd8a. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITZ041600038 — a six-check JSON result.
Aida / Act 3: "Tu...Amonasro!...tu!...il Re?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e7d0e9fa5a443e6df0cf56d9b39ec61594934b2514516fa5a0bf643c165752e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITZ041600041 — a six-check JSON result.
Falstaff: Act I: Sei polli: sei scellini (Falstaff, Bardolfo, Pistola)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe13b2b1efe6cfe955824adc3e4b2c11465d497ed22f72415b757cb32597d8273. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DESB31328503 — a six-check JSON result.
Falstaff: Act I: Ma e tempo d'assottigliar l'ingegno (Falstaff, Bardolfo, Pistola)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74cb66108b7430803accf1fbf18efa8aad8dc9afa84c7a4ca2656b4978741aea. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DESB31328504 — a six-check JSON result.