Frank Lopardo (born 23 December 1957) is an American operatic tenor who was born in Brentwood, New York. Early in his career he specialized in the repertoire of Mozart and Rossini and later transition
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 0xe895eda36a1b368529035af06da94a0108a4b977721f03324aa0d1a8f5ec2f07. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/702c8b23-c0ad-46b2-a4d3-b95dda842c32.json and https://artists.proofprofile.net/proofs/artist/702c8b23-c0ad-46b2-a4d3-b95dda842c32.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Don Giovanni, K. 527, Act I Scene 1: Ah! Del padre in periglio...Ma qual mai s'offre
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 0xf7304dd9f8f07b17a0de3962cd983a438fc05b335892234b8efde100fdff9e92. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBAYC9004366 — a six-check JSON result.
Don Giovanni, K. 527, Act I Scene 1: Fuggi, crudele, fuggi! (Donna Anna, Don Ottavio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf744b277dc5929f0a554a904c144663c0fca571bd776c9dc7f57a368f17df66c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBAYC9004367 — a six-check JSON result.
Don Giovanni, K. 527, Act I Scene 3: Non ti fidar (Don Giovanni, Don Ottavio, Donna Anna, Donna Elvira)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffa7c0fcb5ab9b114b10aa9935240bdde004ae63689bdb8598c056a05714bebf. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/GBAYC9004383 — a six-check JSON result.
Don Giovanni, K. 527, Act I Scene 5: Trema, treme, o scellerato! (Tutti)
Konzertvereinigung der Wiener Staatsopernchor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d822dcc599decdd803d5f569d41b9bf5f9339bef3b856f22183f0c3470ab10f. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GBAYC9004404 — a six-check JSON result.
Don Giovanni, K. 527, Act I Scene 3: Mi par ch'oggi il demonio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25664afe4bcd1e52ab8dce930210fae26ebacded5b18e78960cd0b1e9da5971. 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/GBAYC9004382 — a six-check JSON result.
Don Giovanni, K. 527, Act I Scene 3: Don Ottavio, son morta! (Donna Anna, Don Ottavio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0451c2c47ca20dbe10b0f3f048d462b9a6070937962b3af0261041f2e5de77a. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBAYC9004385 — a six-check JSON result.
Don Giovanni, K. 527, Act I Scene 3: Dalla sua pace (Don Ottavio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7f73865804364dca56925acf1deb4e93ea17aa2f72eda81e13fdb3c9e726bf. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBAYC9004388 — a six-check JSON result.
Don Giovanni, K. 527, Act I Scene 4: Bisogna aver coraggio (Donna Elvira, Don Ottavio, Donna Anna, Leporello, Don Giovanni)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d86df9b08595f99a09ed7cb7f0f51b812dd74151e5208a150c7cbdc8b7755b4. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/GBAYC9004397 — a six-check JSON result.
Don Giovanni, K. 527, Act I Scene 4: Protegge il giusto cielo (Donna Anna, Don Ottavio, Donna Elvira)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc33c80cb024769ee2d7918eb61cb80603a5c00fa1756b37aa645a1615e1919. 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/GBAYC9004398 — a six-check JSON result.
Don Giovanni, K. 527, Act I Scene 5: Venite pur avanti (Leporello, Don Giovanni, Donna Elvira, Don Ottavio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be639386ab4bc8869e2b9a1111214df20ee51185e99df9fd739298a6ec8a0de. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), 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/GBAYC9004401 — a six-check JSON result.
Don Giovanni, K. 527, Act I Scene 5: Ricominciate il suono! (Don Giovanni, Leporello, Donna Elvira, Donna Anna, Don Ottavio, Masetto, Zerlina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5815e89bb3349f91cf98d8b9ce56a7b717f65a0d865b8f38b6c7fde9b6765ff. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/GBAYC9004402 — a six-check JSON result.
Don Giovanni, K. 527, Act I Scene 5: Ecco il birbo (Don Giovanni, Leporello, Don Ottavio, Donna Anna, Donna Elvira)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedbe8dc4575aeaf7f5c097b1f1df24452ee349c1c4db3c1287c97126804872f5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBAYC9004403 — a six-check JSON result.
Don Giovanni, K. 527, Act I Scene 3: Come mai creder deggio (Don Ottavio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ca0457588321ca503f8982b41b5999a304f80afaee6efd66b16b45a47996b71. 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/GBAYC9004387 — a six-check JSON result.
Mozart: Don Giovanni, K. 527, Act 1: Aria. "Dalla sua pace" (Don Ottavio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b7f73865804364dca56925acf1deb4e93ea17aa2f72eda81e13fdb3c9e726bf. 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/GBAYC9004388 — a six-check JSON result.
Mozart: Don Giovanni, K. 527, Act 2: Epilogo. "Questo è il fin di chi fa mal!" (Donna Elvira, Donna Anna, Zerlina, Don Ottavio, Masetto, Leporello)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x392ec66ec970f7d731ddf7a1d9f90b866d54acca3b463eea0353402aa2349ad4. 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/GBAYC9004442 — a six-check JSON result.