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 0x4b4abd9386bf58eb1401ce86e8fec008aabd62846e531d23ce9030f347ea408f. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/25c13ef6-3058-45cc-83ac-da813eaa8ddc.json and https://artists.proofprofile.net/proofs/artist/25c13ef6-3058-45cc-83ac-da813eaa8ddc.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Don Carlo*: Act V: Aria: Tu, che le vanita … Francia, nobile suol (Elisabeth)
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 0x707a7fcb3ea00e0987dd11776ea5b8f9d55cc5094396eaf52c07a9686ac1a3a1. 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/HKI190619819 — a six-check JSON result.
Psalm 146, WAB 37: I. Alleluja! Lobet den Herrn. Langsam (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60a96d69a4c92052c2a7581414c7725ea771f45e012df8459f3703f545dc40b. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/DEAD61605948 — a six-check JSON result.
Don Giovanni, K. 527: Don Giovanni, a cenar teco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0afef0235eb8f5eeae03071e5df1faebb1b83d3c79f57a961b3f5c394d06614b. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/USB8U1612272 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4787975c94b91e50c3335a81b872818c6507b67e19d0eaef230c2c587b31432. 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/FIABA2300037 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1819f739b93bf1db8e87bff5fa58e7218432fb1bebb306591ce3034a0ff2876b. 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/FIABA2300039 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9339e86b1ebc0c47b69467ceb195ed75c3cba39f02fcd897401c9ed4150409eb. 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/FIABA2300040 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7605666bd3ddd7dae8462ee5647198d38d5c016ebde56c049336f8a4d3023f90. 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/FIABA2300041 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c78d32201711f94abceb973f927e1fb46286f99f2aed96c2f2bf2d5755b2a64. 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/FIABA2300044 — a six-check JSON result.
Sweet Rapture & Heartache: Beloved Opera Arias for Soprano
Don Carlo*: Act I: Introduction and Chorus: Su, cacciator! (Hunters)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf631e749cb4c5e5f4ce1feac89f974acfd7186ccbefe50b694fa5932f22a7a01. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190238301 — a six-check JSON result.
Don Carlo*: Act I: Narrative: Fontainebleau! foresta immensa (Don Carlos)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba39e3e82d9c0558efd080970d88da246ea4e5db33ed21205dfda595065ea297. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190238302 — a six-check JSON result.
Don Carlo*: Act I: Romance: Io la vidi e al suo sorriso (Don Carlos)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd44e2fb4a1d1385ecfc7fe6dd1abf67e24880af26811745f045b440c65cc18. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190238303 — a six-check JSON result.
Don Carlo*: Act I: Scene: Il suon del corno (Don Carlos, Tebaldo, Elisabeth)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b60cc9a0dfaa6cea2781693bae794bce21a43323a73319dde15bc7986ca5481. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/HKI190238304 — a six-check JSON result.
Don Carlo*: Act I: Duet: Che mai fate voi? (Elisabeth, DOn Carlos)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x029df9131c447433b3cd64c3b1d8cb45061cf4899e3b3120e80682e720efaba0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190238305 — a six-check JSON result.
Don Carlo*: Act I: Di qual amor (Elisabeth, Don Carlos)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0597d3cf93ea0c08bc6734dc8ca05d5e2c145e6cba00a7cfd9fd554e1ff5b1ea. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190238306 — a six-check JSON result.
Don Carlo*: Act I: Scene: Al fedel ch'ora viene (Tebaldo, Elisabeth, Don Carlos)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c069b2e4c107970a7595d6a939cc13201f3bafc66d250bafdd7ed7249c4405f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190238307 — a six-check JSON result.
Don Carlo*: Act I: Finale: Inni di festa (Elisabeth, Don Carlos, Count of Lerma, People)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca2e0d5de2446da4779a2bc11f1a350633dca6280453cc7021940e922d7ca2a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190238308 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x341c158676e817036cdb278bce9ebe32e1f03c67b36293878e0b138cd4a29c37. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/HKI190238309 — a six-check JSON result.
Don Carlo*: Act II Scene 1: Scene and Prayer: Carlo, il sommo imperatore (Old Monk, Monks)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x618a31080a8aa1029a35b9f67e11ea6f82ba63a5790708de0225cd3bb5a24961. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/HKI190238310 — a six-check JSON result.
Don Carlo*: Act II Scene 1: Scene: Al chiostro di San Giusto (Don Carlos, Old Monk)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x620e5b3f9db6d137d5391a8c69e21ac05be1fb91e009ce3f1275f3cc3fdccd53. 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/HKI190238311 — a six-check JSON result.
Don Carlo*: Act II Scene 1: Duet: E lui! desso! l'infante (Rodrigo, Don Carlos)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18be923f82c775d765f829f5d0c85e3c19ab1893186422bac94cab91e41c6a3f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190238312 — a six-check JSON result.
Don Carlo*: Act II Scene 1: Dio, che nell'alma infondere (Don Carlos, Rodrigo, Old Monk, Monks)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5177b68ee544c6c615d4f9a2a6d61be3d27f25b47b6bd39b5a9984cbc51e8b17. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190238313 — a six-check JSON result.
Don Carlo*: Act II Scene 2: Chorus: Sotto ai folti (Ladies-in-waiting, Tebaldo, Princess Eboli)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x319165b2e1556b452eca712230791cfd26eee9863ab189fd011f8baf3c455a31. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/HKI190238314 — a six-check JSON result.
Don Carlo*: Act II Scene 2: Veil Song: Nel giardin del bello (Eboli, Tebaldo, Ladies)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1e80195e6158019d723bfb172edd9c0a094b718ff08dded201dab677d21789. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/HKI190238315 — a six-check JSON result.
Don Carlo*: Act II Scene 2: Scene: La regina (Eboli, Elisabeth, Tebaldo, Rodrigo, Ladies)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad99a17fc46afe9fcb6742a3dc92c04a40eefda6e76d96921939bbc45a966c9. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/HKI190238316 — a six-check JSON result.
Don Carlo*: Act II Scene 2: Romance: Carlo, ch'e sol il nostro amore (Rodrigo, Elisabeth, Eboli)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56c095b7bf967b0b62368b3f84c1a83981a03d6820eb5579e9d116273ed39842. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190238317 — a six-check JSON result.
Don Carlo*: Act II Scene 2: Duet: Io vengo a domandar (Don Carlos, Elisabeth)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7cc271dea4d2d2c6ef635017bc4c2c9b98fd1ba097d741d8aa62e5ff729dcb. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190238318 — a six-check JSON result.