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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06969bdf0dd21e0b82384d033fdecb6ed171c41f0835b1ec7aac500fd1cc84cf. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/17a9b37a-4b51-41f5-bded-a7d6d8731b6a.json and https://artists.proofprofile.net/proofs/artist/17a9b37a-4b51-41f5-bded-a7d6d8731b6a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
El Orfeón Donostiarra en Su Centenario (Vol. I)
Die Zauberflöte, K. 620: "Der Vogelfänger bin ich ja"
Sudwestfunk Symphony Orchestra Baden-Baden
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdff590b491166dcf3ec597595a7321f8a2b23910da4c0effa3a90a3d1c283ed1. 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/FR3KD1505413.
Die Zauberflöte, K. 620: "Bei Männern, welche Liebe fühlen"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89d4d4c58b3eaf0649482e355ec3fae8fe15c09098909d2227d087ce9f57c2ce. 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/FR3KD1505414.
Die Zauberflöte, K. 620: "Ein Mädchen oder Weibchen wünscht Papageno sich"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487c29a8cc00bcff16f534a4f24801f66ff1d421e9e71b08e369710eb04bb312. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/FR3KD1505415.
Die Zauberflöte, K. 620: "O zittre nicht, mein lieber Sohn"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d959b6025f8a569602488acb0d6a2378400c8ef498228f69596a8b5c9da37a. Chain 2 (Bitcoin): anchored in block 957065 (2026-07-07T16:43:21Z), 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/FR3KD1505422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc78c7debf596c9ffff8038089bcd334765ff4a39b7c3b216fef213d16df9ae. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD1505474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13d3a0033d971617217c7c29fb32a8134bd06166aa8c1ff3d076305ff97fed7. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD1505475.
Cosi fan tutte, K. 588, Act I, Scene 1: "La mia Dorabella" (Ferrando, Guglielmo, Don Alfonso)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc948b654678e6cfbcb0000ff1a83d531db955e56cfad28c6921073dd1be26298. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD1505453.
Cosi fan tutte, K. 588, Act I, Scene 1: "Una bella serenata" (Ferrando, Guglielmo, Don Alfonso)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d712c74ca402e40f13bb1197a3cc310c5a4c5683bb95b5116a55f5c598e313. 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/FR3KD1505454.
Cosi fan tutte, K. 588, Act I, Scene 9: "Smanie implacabili" (Dorabella, Despina, Fiordiligi)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb775dbd83645224071b3baf0bba31d7bdec4704fa19864caf7d91233f9c5b00e. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/FR3KD1505457.
Cosi fan tutte, K. 588, Act I, Scene 11: "Non siate ritrosi" (Guglielmo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ef01ccad305a13cab82c23d791035e78926437bbb59f2c97dbb27c2babc1d9. 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/FR3KD1505458.
Cosi fan tutte, K. 588, Act I, Scene 12: "E voi ridete?" (Don Alfonso, Ferrando, Guglielmo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf50b0be3e57dd7c92ed5cd023852b8d2d21dec0b1601e64f6a5385d0097d6234. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD1505459.
Cosi fan tutte, K. 588, Act II, Scene 1: "Una donna a quindici anni" (Despina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b6195e495d19b82f723629f59e047613034073a633d0afa014e54f8b112e0c. 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/FR3KD1505461.
Cosi fan tutte, K. 588, Act II, Scene 8: "Donne mie, la fate a tanti" (Guglielmo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93cd3e3ef9d0916485c49e0e3ab2b8a9a18d222d841f1cf161d590cb759e73da. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD1505463.
Cosi fan tutte, K. 588, Act II, Scene 11: "È amore un ladroncello" (Dorabella)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8315a1cb3f08f9855141f3befa858911af40feb365d6327057cc7ce6b25a8dc. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD1505464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x129c7575052f2751bd58435d060dffd8da256020294328657673dd68c4940d39. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD1505465.
Don Giovanni, K. 527, Act II, Scene 2: "Il mio tesoro" (Ottavio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22085a83fd6ac6b887d805396c2ff284865142f3d2e692cf4fe156f2ea7e2ae1. 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/FR3KD1505467.
Don Giovanni, K. 527, Act II, Scene 17: "Meta di voi qua vadano" (Don Giovanni)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x646209fc73e2f8507ec347aeb60d158fbaea2512b584965e05951c6fc07ae9dd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD1505471.
Cosi fan tutte, K. 588, Act I, Scene 3: "Vorrei dir" (Don Alfonso, Fiordiligi, Dorabella)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f3dcc00311931d3fc13cdd8fd70ee41ece4cec172314e33d804ab2e807383b. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR3KD1505455.
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
Cosi fan tutte, K. 588, Act I, Scene 11: "Temerari, sortite… Come scoglio immoto resta" (Fiordiligi, Ferrando, Guglielmo, Dorabella, Don Alfonso)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f1367eb76b3744058cf55cb4a3cd5a180c7a55de393798c435b956de50ef316. 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/FR3KD1505460.
The 100 Best Classical Masterworks: Great Opera Moments
Mozart: Cosi fan tutte, K. 588 & Don Giovanni, K. 527
Dioses de la Música - Mozart - Don Giovanni