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 0xc65cdf918a3944c97e3ff092b1bccd534ee89b7ad6a3da77dc6d141e3d68878d. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/34769f4d-8762-452d-9fd9-120efd84b225.json and https://artists.proofprofile.net/proofs/artist/34769f4d-8762-452d-9fd9-120efd84b225.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Così fan tutte, K. 588: Act 1: Terzetto "La Mia Dorabella"
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 0xe47a0a6c76721ac54d63fd24b4066460e9f7982f1ee1235cc1693d406f5e666d. 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/FRZ149813020.
Così fan tutte, K. 588: Act 1: Recitativo "Fuor' la Spada"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b9bcc2ef32079a7488b049fce6cd070570ad6fda23b2f210a1a9bbb1e3f04d2. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/FRZ149813030.
Così fan tutte, K. 588: Act 1: Terzetto "È la Fede Delle Femmine" - Recitativo "Scioccherie Di Poeti!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3dfa3c93bf3283b4d96d49eeeec295994ec9a3c633353d428466545ac0ac46ae. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/FRZ149813040.
Così fan tutte, K. 588: Act 1: "Da Soldati D'onore" - Terzetto "Una Bella Serenata"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a2d14b0b55af9100e016aa769a2c925c0cbfece8d6dd0f79f216322a964d49c. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149813050.
Così fan tutte, K. 588: Act 1: Quintetto "Sento, O Dio"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99def561c6e56d51fbfb618c8cde344ffd99e785e15525946c3bb5ec8764d535. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149813080.
Così fan tutte, K. 588: Act 1: Recitativo "Non Pianger" - Duettino Guglielmo, Ferrando "Al Fato Dàn Legge" - Recitativo "La Commedia È Graziosa"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3eaaa236d76f44119ef926854ed53bd2602e09d82a50cd11db033d522d9358d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149813090.
Così fan tutte, K. 588: Act 1: Coro "Bella Vita Militar!" - Recitativo "Non V'è Più Tempo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0d884b2f99d6c7f398915bca2498fb4814ed20f3d89992cacf2a838a1e148a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149813100.
Così fan tutte, K. 588: Act 1: "Abbraciami, Idol Mio" - Quintetto "Di Scrivermi Ogni Giorno" - Coro "Bella Vita Militar!" / Sc. 6 - Recitativo "Dove Son?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcab1531d416d9ba1114241d417ecffe8c1572f6464b38bd7c38b04a32ad06df1. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/FRZ149813110.
Così fan tutte, K. 588: Act 1: Sestetto "Alla Bella Despinetta" - Recitativo "Che Sussurro!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75709a3e602bb8af101a62a11e38ccf337f3864ad1bae4862e7ba5ecaaa8dbf2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149813190.
Così fan tutte, K. 588: Act 1: "O Ciel! Mirate"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47ac523a9d30a77eea04bbc876f778c9e6f118c73c5666f7fc6bd1b0b5b0a422. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/FRZ149813200.
Così fan tutte, K. 588: Act 1: Recitativo "Ah, Non Partite!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3997ef4e46f5516863e28b6ffa46ee4e41fa30184a374300b52517c34cbdd116. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149813220.
Così fan tutte, K. 588: Act 1: Aria Guglielmo "Non Siate Ritrosi" - Terzetto "E Voi Ridete?" - Recitativo "Si Può Sapere"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678a6cf18fa2cd0080174cd712edfdae27d5a0b50cd94c968df53a644d4a0a12. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149814010.
Così fan tutte, K. 588: Act 1: "Cosa Serve?" - Aria Ferrando "Un'aura Amorosa"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56615c79cd89e4e3e06cdf673a0a38c0f9826383b7ac65405d8443bc0e77c539. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149814020.
Così fan tutte, K. 588: Act 1: Finale, Atto Primo "Ah, Che Tutta In un Momento" - "Si Mora"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97318117e31a3d2c5c07721f1b342820e75d632f97a66213840cebd4182f627a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149814040.
Così fan tutte, K. 588: Act 1: "Eccovi Il Medico"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45f3dbe50dd8218159fb5106022f7353c48770a416e20011c0e1f5d3f6c51fa5. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/FRZ149814050.
Così fan tutte, K. 588: Act 1: "Dove Son?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3927f9c61a97e00d346cbdef29508d3f7d10c825bd7862488f9430e7bb4f22b6. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149814060.
Così fan tutte, K. 588: Act 1: "Dammi un Bacio"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0de4fd589f2fedbf733ef1242ccc1d4b6d17876099ff218ddfca9c9b8c398b27. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149814070.
Così fan tutte, K. 588: Act 2: Duetto Con Coro Guglielmo, Ferrando "Secondate, Aurette Amiche" - Recitativo "Il Tutto Deponete"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3abb627a03ab9b7a5f4fbb969b9dc90c4241c07a7b8a60bd5ddcab18addeb52. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ149814120.