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 0x0f71498b364a0f8a26a55529f3939a8d0956ee21aeacfe933e8132eaaba24f2d. Chain 2 (Bitcoin): anchored in block 953807 (2026-06-15T16:39:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f344b259-3dcf-4b68-b25d-94413ab9a6e3.json and https://artists.proofprofile.net/proofs/artist/f344b259-3dcf-4b68-b25d-94413ab9a6e3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Cosi fan tutte, K. 588, Act I, Scene 1: "La mia Dorabella" (Ferrando, Guglielmo, Don Alfonso)
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 0xc948b654678e6cfbcb0000ff1a83d531db955e56cfad28c6921073dd1be26298. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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 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.
Cosi fan tutte, K. 588, Act I, Scene 9: "In uomini, in soldati" (Despina)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b2756da5c1abf944023486f46d9264fee80755eb093a073b5f31c6115b9b22. 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/FR3KD1505456.
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 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/FR3KD1505459.
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.
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 I, Scene 12: "Un'aura amorosa" (Ferrando)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9204e95dd3b07874c75dff10ecaf3bfbc0d8e8631651f3f0b1d883a6d05b99b1. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/FR3KD1505462.
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 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/FR3KD1505463.