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 0x4a54864c2c4b0bdef41882c770fb42b6ab23341e2f7d183ab067400d98667c22. Chain 2 (Bitcoin): anchored in block 953612 (2026-06-14T08:22:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1670f46f-ba15-44d0-8407-e8fbdd7732b1.json and https://artists.proofprofile.net/proofs/artist/1670f46f-ba15-44d0-8407-e8fbdd7732b1.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Il pittore parigino (The Parisian Painter): Act I Scene 9: Aria: Sul mio core invan presume (Eurilla)
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 0x388c04ea34cf7f3adab22b0d83ca651f9fd1723082cfca9845811b2631e130cf. 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/HUA251297212 — a six-check JSON result.
Haydn, M.: Missa Sancti Francisci / Requiem
Missa Subtitulo S. Francisci Seraphici, "St. Francis Mass": Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00d7fbd610d5160f9a94757690076a17abc9992c2bcc4fd993c0924fc6727c3b. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/HUA253102201 — a six-check JSON result.
Missa Subtitulo S. Francisci Seraphici, "St. Francis Mass": Gloria: Gloria in excelsis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe554fe411b0be5f2e6ccfab9169893547340cedf615805c01a96b60ab9620887. 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/HUA253102202 — a six-check JSON result.
Missa Subtitulo S. Francisci Seraphici, "St. Francis Mass": Gloria: Domine Deus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ca91515279f73c3c10722fec5c57174603f231dde4511cc37029ee38dd4a45a. 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/HUA253102203 — a six-check JSON result.
Missa Subtitulo S. Francisci Seraphici, "St. Francis Mass": Gloria: Quoniam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec242bcac5612e084da486b794fcc9dccabbcf289c8bd811d5b6712d93dbeb7. 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/HUA253102204 — a six-check JSON result.
Missa Subtitulo S. Francisci Seraphici, "St. Francis Mass": Credo: Credo in unum Deum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16d91bcaf9611a1eeb058c80c6398891224f302154d49cfff4263d0400ccb8e0. 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/HUA253102205 — a six-check JSON result.
Missa Subtitulo S. Francisci Seraphici, "St. Francis Mass": Credo: Et incarnatus est
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc244c9cabc6b87aa3ec200153e43bea91bc407666949c44aba473eef24b1e96e. 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/HUA253102206 — a six-check JSON result.
Missa Subtitulo S. Francisci Seraphici, "St. Francis Mass": Credo: Et resurrexit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3359087ad8a07a6d40f8b95c8c6bdb48f53a1ecc63a96c32efe2ce7c30203ae4. 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/HUA253102207 — a six-check JSON result.
Missa Subtitulo S. Francisci Seraphici, "St. Francis Mass": Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc1f9be851d50ddde564451cd6272d6b005c3ae6a3a84242374f0ed9dd1e23f. 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/HUA253102208 — a six-check JSON result.
Missa Subtitulo S. Francisci Seraphici, "St. Francis Mass": Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69120d74a88d16e1755b63868709d19487cf155f8d26cc6d2696075c9babcc85. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HUA253102209 — a six-check JSON result.
Missa Subtitulo S. Francisci Seraphici, "St. Francis Mass": Agnus Dei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37f9379c75025ac74ed96823200919cb89ec4b3278155a9f75421df54b4b5016. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HUA253102210 — a six-check JSON result.
Missa Subtitulo S. Francisci Seraphici, "St. Francis Mass": Agnus Dei: Dona nobis pacem
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x845fae181ba56dd91f61b2e435f5d7f920213f655fe877ea271cff43c605f811. 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/HUA253102211 — a six-check JSON result.
Missa pro defuncto Archiepiscopo Sigismundo, "Mass for the death of Archbishop Sigismund": Introitus et Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0152edb3c2e6d85d9128f7a81fc287ea51dddb80a0aa061207e6907b4b16266. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/HUA253102212 — a six-check JSON result.
Missa pro defuncto Archiepiscopo Sigismundo, "Mass for the death of Archbishop Sigismund": Sequentia: Dies irae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a0416850eb3d7e12516fa293778835d22d2f3d31b976c5ccdc4875ee9c8b4bd. 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/HUA253102213 — a six-check JSON result.
Missa pro defuncto Archiepiscopo Sigismundo, "Mass for the death of Archbishop Sigismund": Offertorium: Domine Jesu
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd0960081ffd4ce945040e4d46b339a9fd37b4fb99a8377e88b2a2b6d8b67cd. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HUA253102214 — a six-check JSON result.
Missa pro defuncto Archiepiscopo Sigismundo, "Mass for the death of Archbishop Sigismund": Hostias
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb4134b7f799d35271916b094eea9c146035616e495cd2c74c352c13c7a13e4d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HUA253102215 — a six-check JSON result.
Missa pro defuncto Archiepiscopo Sigismundo, "Mass for the death of Archbishop Sigismund": Sanctus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b1053f53e2f428f615d5d797f64bf02de198e9254a9b8ebf69489d598e26b79. 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/HUA253102216 — a six-check JSON result.
Missa pro defuncto Archiepiscopo Sigismundo, "Mass for the death of Archbishop Sigismund": Benedictus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6902a31c7866edbd3c723a7ed68a5f4e91c4ea6f3cc7ff0af26af6e4c8a05b9. 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/HUA253102217 — a six-check JSON result.
Missa pro defuncto Archiepiscopo Sigismundo, "Mass for the death of Archbishop Sigismund": Agnus Dei et Communio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56df8d85395e59104f5ad0b7f610eeab13fdd42e54e0fc08179e5ce6e3a9ac8. 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/HUA253102218 — a six-check JSON result.