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 0x9f6c131153136b7fdb408aa48a96b19d27bd79ae14f1466ad3b82f7026c387a2. 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/2661a7be-bd8e-43c4-bcfe-25cbc6fbad2e.json and https://artists.proofprofile.net/proofs/artist/2661a7be-bd8e-43c4-bcfe-25cbc6fbad2e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mozart: Le Nozze Di Figaro, ‘the Marriage Of Figaro’ (Highlights)
Le Nozze di Figaro (The Marriage of Figaro), K. 492: Overture
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 0x03768401ededc01b226f30a88e5ef50cbfd6be05f2c1cdbc1ce9622ff7f25365. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736801.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act I Scene 1: Duettino - Cinque, Dieci...
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d2f19fc95d8e7a407813bcdb78af02c5cdd845740217c24b618fd7e37d21e00. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736802.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act I Scene 2: Recitativo - Bravo, Signor Padrone!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdccf6244df031849363b52934c25b6691ca4ee018b1ed70aa27974d080241157. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736803.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act I Scene 2: Cavatina - Se Vuol Ballare, Signor Contino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa15703b2ee085e8061ef16a76185aa083ed965e2f94e39b8e2efbf615f304729. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736804.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act I Scene 3: Aria - La Vendetta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5b84a6fa97941682a7887f7972ee12b07dce50f7592f18aff014dcf12136d9. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736805.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act I Scene 4: Aria - Nos So Piu Cosa Son
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86cc0abcc752ab152d6e11be4bf62f56a896792c1fc09797d7cecabbc1293974. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736806.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act I Scene 8: Aria - Non Piu Andrai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb34e52c66c934d3a3af5f90ad56cf01ff5c9b4c412482f01b3e08adbfe8cf55. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736807.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act II Scene 1: Cavatina - Porgi Amor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7618bd51f2d686f6e637694c7210b4dfab0adfb38ed637b00fb5bcb55864fe8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736808.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act II Scene 3: Canzona - Voi, Che Sapete
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf30e58d91b385cea930cf29ac9629eefa3807b97d6de4dcdb1cba62ce996a1f3. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736809.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act II Scene 3: Aria - Venite, Inginocchiatevi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36b67ab55284ffa45ad68bd0574be631b0a5ec10a1aff4f799df0f5c1e82a76d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736810.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act II Scene 6: Terzetto - Susanna, Or Via Sortite?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cfe6d84c1eda89e08ef130dabde3182993bbac63ead49fb2bec3513658efd31. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736811.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act III Scene 4: Recitativo - Hai Gia Vinta Causa!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc203b2c644f51daf58eabfd8f89771b974c8bdbfaabf865ccd84847db2c9883e. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736812.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act III Scene 4: Aria - Vedro, Menter'io Sospiro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcca37f31129b01fbe16b1c51338a204edb72931f297bac33e1098d8cf76063cf. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736813.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act III Scene 5: Sestetto - Riconosci In Questo Amplesso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x153131d05f6beabc7b99004fac86cf05f03139d50f86d404053647e385692331. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736814.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act III Scene 8: Recitativo - E Susanna Non Vien!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fa286d343b2bace705560ae7056011e6ccb1c31f9b03374eb6f70d38f211b4f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736815.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act III Scene 8: Aria - Dove Sono I Bei Momenti?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7e61422abb3fc38744888543307bea50d340e99356a1e300b0dbc33dae4aef. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736816.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act III Scene 10: Duettino - Sull'aria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaace1b7a6593ec59efc7c2adf3d7dceaa18ce97c43ae818864449b0923b90dfd. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736817.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act IV Scene 8: Recitativo - Tutto E Disposto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dc7d69642c08cff27e7045486d64e26a0f875fc84a789aee172c535bb0a7667. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736818.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act IV Scene 8: Aria - Aprite Un Po' Quegl'occhi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a5a1adcffa02a3df350e1ef729a3945d84b1a71611b712ebeb866610d8cee36. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736819.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act IV Scene 10: Recitativo - Giunse Al Fin Il Momento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ee843c4482818c174ead1fa4e8e04c8d66946476af3ba1b057a5244e9c0dfb. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736820.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act IV Scene 10: Aria - Deh Vieni Non Tardar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5420490c36439b79b2d89f412a328fd686802472575fe47f3b30c1aadf70b42b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736821.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Act IV Scene 11: Finale - ... Pace, Pace, Mio Dolce Tesoro!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1937675f5b30b9fe5bf99279598ca076adfb1cc7d6d176e42b132159197764e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736822.
Le Nozze Di Figaro (The Marriage Of Figaro), K. 492: Final Scene: Gente! Gente!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e407e9f47a12198897c7395296509557559e33964104e1b1d19bfc9ee0446c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199736823.
La traviata / Act 1: "Libiamo ne'lieti calici" (Brindisi)
Orchestra del Maggio Musicale Fiorentino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d95be7f9344c778f2d9f5f80952b244ed45e4578e4f6dd0e9cd467ac526a1f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA509104303.