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 0x6b6497e2bdc82555f642aa19e1c8999fdbd489087046b9c4404d02eb162dd7cb. 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/edb15f6c-12b1-4042-b2f3-4d5cfa7e5f9b.json and https://artists.proofprofile.net/proofs/artist/edb15f6c-12b1-4042-b2f3-4d5cfa7e5f9b.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Il mito dell'opera: Werther (Sung in Italian) [Live]
Mozart: Le nozze di Figaro, K. 492: Sinfonia. Presto
Philharmonia Orchestra & Carlo Maria Giulini
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 0x11f16bc9d54a980a2996ce197cf35c942d6c6d11cb9bb5a3c424431663d88b63. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/GBAYC8900797 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act II, Scene 10: "Conoscete, signor Figaro" (Conte, Figaro, Susanna, Contessa) - "Ah signor" (Antonio, Conte, Susanna, Contessa, Figaro)
Giuseppe Taddei/Anna Moffo/Eberhard Waechter/Elisabeth Schwarzkopf/Ivo Vinco/Dora Gatta/Renato Ercolani/Philharmonia Orchestra/Carlo Maria Giulini
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7279572619088f22cbbc86accdeb351534fafdb1ad0db5495b06ab3e2c4d64c5. 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/GBAYC8900831 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act I, Scene 1: No. 1, Duettino. "Cinque" - "Dieci" - "Venti" - Recitativo. "Cosa stai misurando" (Susanna, Figaro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3873a4fdaf915a5c1648a3cd578c2dc1381d9acdfd59c0a00a8d6d60e056b952. 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/GBAYC8900799 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act II, Scene 12: "Voi signor, che giusto siete" (Marcellina, Basilio, Bartolo, Conte, Contessa, Figaro, Susanna)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd062f2538e9aadeb53b1511889afca582e1432abffafac7d6985d77b25c9c68e. 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/GBAYC8900832 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act I, Scene 1: No. 2, Duettino. "Se a caso madama" (Figaro, Susanna)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9d60af6aa3c88cc5f9e56364c88f7a89b8c83ebb4d65a031bb626c9abdf4451. 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/GBAYC8900800 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act I, Scene 1: Recitativo. "Or bene, ascolta e taci" - Recitativo. "Bravo, signor padrone!" (Susanna, Figaro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf8d04f92fcbcf4f169d152b5d5b0320208bd6d37e7ef8db11e162b8e2cf9a73. 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/GBAYC8900801 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act I, Scene 2: No. 3, Cavatina. "Se vuol ballare, signor contino" (Figaro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe58aa79c2bb661d5bfbe4727923b60ad2a2bba717bb051f07fe5cd443cd1b247. Chain 2 (Bitcoin): anchored in block 960430 (2026-07-31T16:09:41Z), 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/GBAYC8900802 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act I, Scene 3: Recitativo. "Ed aspettaste il giorno" (Bartolo, Marcellina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b7a641a72ac7e336771c298080b9b382c8cf48fbe785d5672b9ecf9c1cdf86. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/GBAYC8900803 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act III, Scene 4: No. 17, Recitativo ed Aria. "Hai già vinta la causa! … Vedrò mentre io sospiro" (Conte)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb03c2d266618110a8d88f353ac7c13a6b0483bd796a1e3b43f9334538257b5c8. 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/GBAYC8900837 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act I, Scene 3: No. 4, Aria. "La vendetta, oh, la vendetta" (Bartolo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7549f26d92be0b8c4064a73db39fdfcfb77fcd8d86a3ec8bde0a0928e7173db3. 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/GBAYC8900804 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act I, Scene 4: No. 5, Duettino. "Via, resti servita, madame brillante" (Marcellina, Susanna)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0a846b5f82b797ef859ed68c02332a0a024782df0a9c4a536f446adc48d4eb. 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/GBAYC8900806 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act I, Scene 5: Recitativo. "Va là, veochia pedante" (Susanna, Cherubino)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4bfaf4f60451cb2bfc6d670d9a3adba0fc7cffc5784142c419e7e78ee0bb410. 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/GBAYC8900807 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act 3: Recitativo. "E Susanna non vien!" - Aria. "Dove sono i bei momenti" (Contessa)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928c3ab0f95026955034f2c0da86948bb4ba030ebd896ea33f506bf9dc3a1a36. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/GBAYC8900841 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act I, Scene 5: No. 6, Aria. "Non so più cosa son, cos faccio" (Cherubino)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51cafed569798bc393d54abf3f3b2be755ad3987c6b92c1c42d5881d985e366. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/GBAYC8900808 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act I, Scene 6: Recitativo. "Ah! son perduto!" - "Susanna, il ciel vi salvi" (Cherubino, Susanna, Conte, Basilio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f07f8c8745aea650509418469c0ae6d67dc7ca4e26580c0d065c748f646277e. 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/GBAYC8900809 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act 3: Duettino. "Sull'aria..." - Recitativo. "Piegato è il foglio" (Susanna, Contessa)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26887d5916722bfda58345d7020036b8497dacc7bae86acf356a51fa899a7c01. 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/GBAYC8900843 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act I, Scene 7: No. 7, Terzetto. "Cosa sento! Tosto andate" (Conte, Basilio, Susanna)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58da98c86b0f2fadcf67b604472d3cd64c13e56a90e0f40b54b941e68b82e65c. 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/GBAYC8900810 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act IV, Scene 8: No. 26, Recitativo ed Aria. "Tutto è disposto" - "Aprite un po' quelgli occhi" (Figaro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c08a21449ef57e6b75a674a55453268d4d047be92a05c488ea25bc960646a4e. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBAYC8900848 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act I, Scene 8: No. 9, Aria. "Non più andrai, farfallone amoroso" (Figaro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e37d801f9f3c7ccce9d5e0c5b4bab7ba36689d85cc31f2cf6b789ec819254f2. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/GBAYC8900815 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act IV, Scene 10: No. 27, Recitativo ed Aria. "Giunse alfin il momento … Deh vieni, non tardar" (Susanna)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76950c4e7980f990fdd308d3f30d73b15450dd2a866799112f0330c94ca87aa. 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/GBAYC8900850 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act 2: Cavatina. "Porgi, amor" (Contessa)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cc72c4ecea25e242bf57c5578972dc7d61771b61df4147a8ba446b6a05bc77b. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBAYC8900817 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act II, Scene 3: Recitativo. "Quando duolmi, Susanna" (Contessa, Susanna, Cherubino)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa015a95e7752dcba66019ab2845ea6c34b3a7b9809397580bad4bbe62234a447. 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/GBAYC8900819 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act 2: Terzetto. "Susanna, or via sortite" (Conte, Contessa, Susanna)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ef196733a48244e6b80a3bdd84125d73c7a9ab7d14ba66870cfe306a0b9e0bb. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/GBAYC8900825 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act II, Scene 7: No. 14, Duettino. "Aprite, presto, aprite" (Susanna, Cherubino) - Recitativo, "Oh guarda il demonietto" (Susanna)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfff3c41020b61a6071a6d886fedd2d63a7d1351bcf248d777da3a41053b4398b. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBAYC8900827 — a six-check JSON result.
Mozart: Le nozze di Figaro, K. 492, Act II, Scene 9: "Signore! cos'è quel stupore?" (Susanna, Conte, Contessa) - "Signori, di fuori son già i suonatori" (Figaro, Conte, Susanna, Contessa)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c75ae712aea6fd1be6e20e6ec9c6382705720df010e5b1111c95951b10a6b9b. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/GBAYC8900830 — a six-check JSON result.
Mozart: Le nozze di Figaro (Stereo Version)
Cimarosa: L'impresario in angustie (Recorded 1963)
Mozart: Le nozze di Figaro (Mono Version)
Monteverdi: II Combattimento di Tancredi e Clorinda, Il Lamento di Arianna & Se i languidi miei sguardi