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 0x1a5ef6eada9380788a3ad6a687c4f9b291de6c60f171ef8082541baed1567074. Chain 2 (Bitcoin): anchored in block 954050 (2026-06-17T05:14:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4304c110-29d6-438c-b95c-70cdab7bc4a2.json and https://artists.proofprofile.net/proofs/artist/4304c110-29d6-438c-b95c-70cdab7bc4a2.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
La fanciulla del West: Act II: Una parola sola
Orchestra Sinfonica Nazionale della RAI di Torino
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 0x63663326eb9841fbd5651bb7beb3ac66ed377c1990bf3a32f8cee0057fefb3a4. 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/USB8U1520852 — a six-check JSON result.
La fanciulla del West: Act II: Or son sei mesi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa393aac5b7fad93a62958195c91da01da0bee32810f43eedc6b32e2e9d011e8b. 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/USB8U1520853 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3131e2aa2eb41f10e63bbd34eb659eca312cae3021d646d8c851ff0cb4bc7142. 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/USB8U1520883 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c4434a88ccbda82e04b71a779d340a9061b8921df66bc1eff3eb8bc6dae47a4. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/USB8U1520854 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c1e6bfa98270f6b7ac4709d357ada68dc892b3cc3d6f432ab170bc83481b5e7. 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/USB8U1520855 — a six-check JSON result.
Adriana Lecouvreur: Act I: La dolcissima effige
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc2f09ac9f59bb3b3b8e9d56897e77d6d73d714f0c8800053ace568cf989670d. 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/USB8U1520856 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48385908c61e912783f6228477ac1e696eaf628b2fb7439da89abc643fb5aeaf. 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/USB8U1520886 — a six-check JSON result.
Adriana Lecouvreur: Act II: L'anima ho stanca
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x596133314015da83d4615a2a2e3a985d636e41c9a9762e85955667c962422cc9. 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/USB8U1520857 — a six-check JSON result.
La favorita, Act I: Una vergine, un'angel di Dio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42014b3eeae5cd93bb1c7e7cb4782bf1d60c0f51e77692ab3fa4c130249f07c2. 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/USB8U1520858 — a six-check JSON result.
Cavalleria Rusticana: Mamma, quel vino e generoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cd15993a10e36f3c3b5704aec544ae1653ce5b98fc3fc78ad82407272480a3d. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/USB8U1520888 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f5d508bb102a6074c3ff4d686f4ecdcaf345ebc78d7ede642d51360bcab277. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/USB8U1520859 — a six-check JSON result.
Tosca, S. 69: Act III: E lucevan le stelle
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52082dbf26f6d4b640f512eed08e15aea21ba5c1ef98dd8a4bfe7e344b5c1e07. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/USB8U1520860 — a six-check JSON result.
La fanciulla del West, Act III: Ch'ella mi creda libero e lontano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2abd7718356866d811e693a2266b4ea2cfa91a5d7171271e95ebc6353b86ad. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/USB8U1520861 — a six-check JSON result.
Lucia di Lammermoor: Act II: Fra poco a me ricovero
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf1000e9aeae4d7e119371f29236e133e95572ddf0927f3e3a0be52c66c8788. 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/USB8U1520863 — a six-check JSON result.
I Lombardi alla prima crociata, Act II: La mia letizia infondere
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec05376a1a4300702853933e253097e02fa68c449e47e351247caa919f6ee9a2. 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/USB8U1520864 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd31270875b7a918bfb068d76cbb3643ffd20fc86f2d96d4910054f54e394e609. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USB8U1520865 — a six-check JSON result.
Un ballo in maschera: Act III: Ma se m'e forza perderti
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa34a07ff75b32d595110ca81da51cc3ca1e881da45787b94d4be66396588253c. 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/USB8U1520867 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77f910d7902922cd20ff87b99654fc1f0e2eb41a94816b53603665793e537c81. 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/USB8U1520868 — a six-check JSON result.
La forza del destino: Act III: La vita e inferno all'infelice
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eef3ef91038336534c79e5df1208266a9d43afa648b44ef72a4a3b1998553a8. 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/USB8U1520869 — a six-check JSON result.
La forza del destino: Act III: O tu che in seno agli angeli
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab7cb786c385c7ac2f720b50c0befd1232adf5d0ab599f5af332a16244b6c49. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/USB8U1520870 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x959e92cff91cadaf243f47c746308463a568c9de2ee152b9f68820f71e0fe9c9. 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/USB8U1520877 — a six-check JSON result.
Franco Corelli: Power and Beauty, Vol. 10 (1955-1960)
Franco Corelli: Power and Beauty, Vol. 6 (1956-1961)
Wagner: Der Fliegende Hollander (Sung in Italian)
Verdi: I Lombardi alla Prima Crociata (1957)
Il mito dell'opera: Giacinto Prandelli (Recorded 1949-1956)
Glinka: Zhizn' za tsarya (A Life for the Tsar) (1954)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1be132a3b45e7b1584edd9362445f5e2788e6847f3521d5d04db73f6eca6abf7. 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/USY9R0914950 — a six-check JSON result.
Maria Stuarda: "Figlia impura di Bolena"
Orchestra del Maggio Musicale Fiorentino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bdd1a2c888eac421f8251e342d548cae891f8bd2d64bc39bad60a8d1ee032ca. 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/USY9R0914952 — a six-check JSON result.
L'elisir d'amore (The Elixir of Love), Act II: Una furtiva lagrima
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2178f2faf73515cbc8d2f35fc4e821bb2d4ddc39f5acd51747c6071762187a9b. 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/USB8U1518983 — a six-check JSON result.
Opera Arias (Soprano): Tebaldi, Renata - Verdi, G. / Puccini, G. / Gounod, C.-F. / Mozart, W.A. / Boito, A. / Catalani, A. (Tebaldi) (1949-1953)
Verdi, G.: Giovanna D'Arco [Opera] (1951)
Franco Corelli: Power and Beauty, Vol. 1 (1954-1961)
Opera Arias (Soprano): Tebaldi, Renata - Boito, A. / Giordano, U. / Cilea, F. / Verdi, G. / Puccini, G. / Mascagni, P. / Verdi, G. (1950-1956)
Tchaikovsky: Eugene Onegin (Sung in Italian) (1953)
Holzbauer: Günther von Schwarzburg (1960)
Minas Borboudakis: Photonic constructions
Mozart: Die Entführung aus dem Serail (1958)
Franco Corelli: Power and Beauty, Vol. 9 (1954-1959)
Puccini, G.: Manon Lescaut (Highlights) [1950]