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 0x00e574625a72138641d1de93c3ebe3d1bfa165bf21d45748bef252dd869e3979. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7b8d8b4e-f24c-42af-8cea-037fae1baaaf.json and https://artists.proofprofile.net/proofs/artist/7b8d8b4e-f24c-42af-8cea-037fae1baaaf.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Cavalieri: Rappresentatione di anima et di corpo
Rappresentatione di anima et di corpo: Sinfonia
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 0x1e7ae663a8e3c96d01a2099422f487e0394264f8f929c08fee95a8fe5a08bfa5. 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/FRZ141407010 — a six-check JSON result.
Rappresentatione di anima et di corpo: O Signor santo e vero (Choro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x838a7d4a4d2a58b213f93dd9d1a915b658d5c9357a5bed6cc517aba3a462a190. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/FRZ141407020 — a six-check JSON result.
Rappresentatione di anima et di corpo, Atto I Scena 1: "Il tempo, il tempo fugge" (Tempo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x166e194226708e9bf155844686b5ac10c8c233e7819f7a09eecfafbdba83d652. 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/FRZ141407040 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7eb804cd75b57e688ac506745c7c4272b4c0d48c5bbff1a584e042c970b2931. 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/DEN962530101 — a six-check JSON result.
The Passenger, Act I Scene 1: Das Ufer in der Ferne ist nicht mehr zu sehn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aac08db204c8861a4b395107bd3177a518fbe64902a9eb783fff1e8e1500c57. 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/DEN962530102 — a six-check JSON result.
The Passenger, Act I Scene 1: Drei Jahre sind im Nu vorbei
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f6886e3f4c9949256e980ffc14a993c4e340f3413e218bef8b76f808489e03c. 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/DEN962530103 — a six-check JSON result.
The Passenger, Act I Scene 1: Was ist los mit Ihnen, Aufseherin Franz?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1fba8c706e17593c8ca4be73c019535b7ad8fb95709f4ea3a97477c1636cec9. 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/DEN962530104 — a six-check JSON result.
The Passenger, Act I Scene 1: Marta? Kann das Marta sein?
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x710fa859ca044f7b38bf2c781b6f0ad90509d9ae1ff4d06708a455eaa687bb79. 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/DEN962530105 — a six-check JSON result.
The Passenger, Act I Scene 1: Negro paredón
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe42518f8752ce88f29ea7488dbc66d79d975354603f37d9108c1721085615945. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/DEN962530106 — a six-check JSON result.
The Passenger, Act I Scene 1: Das ist alles Unsinn!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb549cdd3cd6c5f47d6afac2c0ef558aad388778c3419064521c105e737c4f1c8. 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/DEN962530107 — a six-check JSON result.
The Passenger, Act I Scene 1: Sei still, sei still
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547628453163006114341ec1bbf0dac74b83ecf13fb7b89b06d45fd4bbfecb04. 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/DEN962530108 — a six-check JSON result.
The Passenger, Act I Scene 1: Angst hat mir nachts die Kehle zugeschnürt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5126e0be09d47f738d67be1e09f9899ce21de7f831fb6f706d680b6cb1343619. 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/DEN962530109 — a six-check JSON result.
The Passenger, Act I Scene 1: Für ein schweres Vergehen, da kam sie in den "Todesblock"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ca0fd75e622589cd476b98e71419009cae7bada450bec9cf5ec3f76880d633. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/DEN962530110 — a six-check JSON result.
The Passenger, Act I Scene 1: Fort, Gespenster der Vergangenheit!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed58ba307cbd67caa34a9857a919399d576122ccccbdebb404408eeed777b13. 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/DEN962530111 — a six-check JSON result.
The Passenger, Act I Scene 2: Wie langweilig ist’s hier, Hans!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130493398a4d2800a545a1e4b851564cae042cd7c79dba3db011b96e2cd5416c. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DEN962530113 — a six-check JSON result.
The Passenger, Act I Scene 2: Ty ukryt ot nyeba reshyotkoy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe99812206dd015f91440ceae199accdb5dd047e9557a4e5e8f8a7e8fe43812. 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/DEN962530114 — a six-check JSON result.
The Passenger, Act I Scene 3: Další den minul, uplynul
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbde46d527599d6171bd23307b9182964cf9d8ed40a40d42717c83487ecdfd46. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/DEN962530120 — a six-check JSON result.
The Passenger, Act II Scene 6: Jeśliby zawezwał mnie do siebie Bóg
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cae4a2dba07d9164a181cbdd39baef398c306c3c4ce97ec0029ce261fea78ba. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/DEN962530133 — a six-check JSON result.
The Passenger, Act II Scene 7: Your Good Health, Sir
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15aea9ec983f262f726764edd2dfb450ed7de464a8ab8252f1306ff9755b22d7. 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/DEN962530142 — a six-check JSON result.
Kodaly, Z.: Complete Songs for Voice and Piano
Kodaly, Z.: Vocal Music (Complete Edition - Art Songs)