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 0x1a39426e7c4fb9393516432793e3000b589f6028e3c41206e4a17a4a5e34dd76. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/af3fabe2-9e2e-422c-9528-e72640c4d585.json and https://artists.proofprofile.net/proofs/artist/af3fabe2-9e2e-422c-9528-e72640c4d585.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Frizzante: Celebrating Vocal Music Celebration
Un ballo in maschera, Act I: Preludio (Live)
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 0x885b6678255f7691235a4103f7249a86665b0834200146fb6dfdbf5922607ed1. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DEB951998028 — a six-check JSON result.
Un ballo in maschera, Act I Scene 1: Posa in pace (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b500b855ab81cc1013b9f06151276ac4cf98e9565fa2906c0c759017ea7fc1. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEB951998029 — a six-check JSON result.
Un ballo in maschera, Act I Scene 1: Amici miei, soldati (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2f02b27c8230fb6b3133fe7d2e982e4aa85c80a4cc61e4f8aa03bd81d5c487. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DEB951998030 — a six-check JSON result.
Un ballo in maschera, Act I Scene 1: Il cenno mio di lá con essi attendi (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3db1c58f3e38b5aab77bd4d1759e525d63e58c6a3e74e3be5acedf0b17422561. 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/DEB951998031 — a six-check JSON result.
Un ballo in maschera, Act I Scene 1: Alla vita che t'arride (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d40233ede81b5df1d58a3d274abca2c81836a0bb6bb3a3b62807f37b0e4af5. 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/DEB951998032 — a six-check JSON result.
Un ballo in maschera, Act I Scene 1: Il primo giudice (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8e86994826045085280718cd7d4528f9765e33be444674b69bfcc2c79dcaac. 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/DEB951998033 — a six-check JSON result.
Un ballo in maschera, Act I Scene 2: Zitti, l'incanto non dèssi turbare (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe595dce4272103fe5046496202cce4b57be5078296e2dd38a08edec867d70639. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEB951998034 — a six-check JSON result.
Un ballo in maschera, Act I Scene 2: Arrivo il primo! (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe497e371aa539a0a24f420fcd6e8831f3ba6bfa1486de838afb58221f619234d. 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/DEB951998035 — a six-check JSON result.
Un ballo in maschera, Act I Scene 2: Che v'agita così? (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec105e3d2cd03817d5542e3465d8df194dc728c6da34a901b5114031c3ddafb. 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/DEB951998037 — a six-check JSON result.
Un ballo in maschera, Act I Scene 2: Su, profetessa (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x049ea92c0edce52f31453c95373415ddef5f7e63b762087715cab1140185ef58. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB951998038 — a six-check JSON result.
Un ballo in maschera, Act I Scene 2: Finisici il vaticinio (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1534e981be144bab1ceb99786f329611fa051708f43257f8d6e84d761ea4d7bf. 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/DEB951998040 — a six-check JSON result.
La Bohème / Act I: "O soave fanciulla" - Live At Metropolitan Opera House, New York / 2011
Anna Netrebko - Live at the Metropolitan Opera
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ecdf07b91664efa755dc33877c795e4cf827982ed2be7f27a9b37d4eb18d2d. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEUM71102733 — a six-check JSON result.
Meine Lippen sie küssen so heiss - Operetta's Greatest Hits
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9a41e6738b8b930154d264af0ab0f805f106af5cb131807e227bb9f6ed20f17. 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/DEN960800270 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9a41e6738b8b930154d264af0ab0f805f106af5cb131807e227bb9f6ed20f17. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960800270 — a six-check JSON result.