thumb|Penno in Ernani at Teatro Verdi Gino Penno (8 December 1920 – 8 February 1998) was an Italian tenor, who enjoyed a short but brilliant career in opera in the 1950s. Penno was born in Felizzano,
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 0x53a8a291d2077e0680a4a01879bb6d6b6e75774213bbe9eba5fd11bfdc621b5f. Chain 2 (Bitcoin): anchored in block 953877 (2026-06-16T02:39:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0554ce22-ab86-4cde-8c5b-cf48573c7795.json and https://artists.proofprofile.net/proofs/artist/0554ce22-ab86-4cde-8c5b-cf48573c7795.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Maria Callas Live - Remastered Live Recordings 1949-1964
Spontini: Fernando Cortez, ou La conquete du Mexique (1950, 1951)
Mia l'amore no - From Stasera niente di nuovo 1942
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 0xa820f986bf64d25d1516e46b4bfbbb5cf197156b4391c37191a59573bbbf946e. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DGA052205282 — a six-check JSON result.
100 Greatest Tenors, Vol. 3 (Recordings from 1941 to 1960)
Verdi: La forza del destino (Recorded Live 1954)
Cherubini: Medea (1953 - Milan) - Callas Live Remastered
Cherubini: Medea, Act I: "Nemici senza cor" (Medea, Giasone) [Live]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc034dcec1e758b761c4a6c71611d1e5bb55370e03ac9babc7d7428d2e0d4493f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBPFW1700171 — a six-check JSON result.
Cherubini: Medea, Act III: "E che? Io son Medea!" (Medea, Chorus, Giasone, Neris) [Live]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba347c2d4c766dcb2e85b41882fd743c94ca861ba9b18691e0168639e3f6dfbf. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/GBPFW1700185 — a six-check JSON result.
Verdi Historical Opera Edition, Vol. 6: Simon Boccanegra, Aroldo & Un Ballo in Maschera
The Chorus and Orchestra of the Maggio Musicale Fiorentino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c8c2503bffe172d343aabeede28cbcbc958ea7d023e57c423f368c582e4adb. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/ATP130248224 — a six-check JSON result.
Macbeth (1997 - Remaster), Act I Scene 2: Nel di della vittoria io le incontrai...
Orchestra Del Teatro Alla Scala Di Milan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe403fc7fb4f4ab90efa50367c917b886cb6aabfda591e9db446932c8ba97c5dd. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBAYC9705960 — a six-check JSON result.
Macbeth (1997 - Remaster), Act I Scene 2: Vieni! t'affretta!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8d126c91a182fdacfaf619a5aab24dfc56d0a117728a0768ea201222cf15f9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBAYC9705961 — a six-check JSON result.
Macbeth (1997 - Remaster), Act I Scene 2: Or tutti sorgete, ministri infernale
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63612e5c1f9af903a7c78cf47cd062ef628c6939c9c5877094e00c36b5093314. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/GBAYC9705963 — a six-check JSON result.
Macbeth (1997 - Remaster), Act II Scene 1: La luce langue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x619db89b1284078eed26605e8ee184c9ab17ca0d684c29254d4152aadc863260. 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/GBAYC9705974 — a six-check JSON result.
Macbeth (1997 - Remaster), Act III Scene 3: Si colmi il calice
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947f39916f52690db4ca2d215e00c6ebe2c7348470a89fe92b04b7f2fab360cc. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/GBAYC9705981 — a six-check JSON result.
Verdi: Macbeth (1952 - Milan) - Callas Live Remastered
Verdi: Macbeth, Act 1: "Nel dì della vittoria io le incontrai" (Lady Macbeth) [Live]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ef373edffac216fffd30449343c2d11edf4a7478c709755a9b53431ad12242. 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/GBAYC1701129 — a six-check JSON result.
Verdi: Macbeth, Act 1: "Vieni! t'affretta!" (Lady Macbeth) [Live]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343983bd7b97542205ab6ff80074a0e1e699dfa522b4c93b3d533ecdd0f7359b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBAYC1701130 — a six-check JSON result.
Verdi: Macbeth, Act 1: "Al cader della sera il re qui giunge" (Servant, Lady Macbeth) [Live]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96048387824f75ac9bf6e6f4e11884569910cd3bdcf6de5c481b1fcfa37128d4. 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/GBAYC1701131 — a six-check JSON result.
Verdi: Macbeth, Act 1: "Or tutti sorgete, ministri infernali" (Lady Macbeth) [Live]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb0514cf09ae6bc7123fb4e5328930f4146da185bed0b75a1771ef8fbb6c7394. 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/GBAYC1701132 — a six-check JSON result.
Verdi: Macbeth, Act 2: "La luce langue" (Lady Macbeth) [Live]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce4f042069d93ccff37f1fccd8229f7eaf8894374e75b9205852ffca855bb7f5. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBAYC1701142 — a six-check JSON result.
Verdi: Macbeth, Act 4: "Una macchia è qui tuttora" (Lady Macbeth, Doctor, Lady) [Live]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5577601009a0016cddd6a63a6e2223b7edabd941b8b8f19b6e268cae9d4d2b17. 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/GBAYC1701163 — a six-check JSON result.
Les Puritains (1997 Digital Remaster): O rendetemi la speme...Vien, diletto, è in ciel la luna
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x211ddfd8a366502c306e1fbb2ec9e5b6a5c9fe2a914f44e683029d4a782f3f69. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBAYC0702735 — a six-check JSON result.
Verdi Historical Opera Edition, Vol. 2: I Lombardi, Ernani & I due Foscari
Verdi Historical Opera Edition, Vol. 3: Giovanna d'Arco, Attila & La Battaglia di Legnano