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 0xab49be842963df00d15c110d5ea19a3c32cfe5a06836e4a5a9c1ca9e42e72c67. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/38301c82-c806-4784-b5a3-cc948792c85f.json and https://artists.proofprofile.net/proofs/artist/38301c82-c806-4784-b5a3-cc948792c85f.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Gaspar Cassadó, Carl Maria von Weber: Cellokonzerte
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 0x7d53e222780468ccc68bfeddca162fb53c0efc92b6c0ac74276f4b0469defefb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITD541400325 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb2c1e5a4131d4131a16efa6bccad1d5e7676994b83a1fe2799378a66e94595. 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/ITD541400328 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd86231c52c3068d18c08c7c6ec42bfb9ae1e2c8a2c697fe725dba388a3b134c8. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ITD541400333 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fb9b29c09b2c27ef95ee42617fd7454f327348433ccab61ace0a619a71d85a6. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ITD541400334 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde2288c64e14710f921ebd33fb1636d607230da5e3044e3598ea266fca2ddb2e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ITD541400335 — a six-check JSON result.
Der Schauspieldirektor, K. 486: Ouverture
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eedbf73da3cdcf1716e266b64d93670aa2189f87ac5cc2feced16d228800d49. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/ITD541400336 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7fa41fe9dc6aa15743efcb8f42c806fc83d471955b07ad8912079cb2729921d. 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/ITD541400337 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa458cae766e2b4e4fe5226e3b1b761d40a9a5a8ac38b6ad91f4ce81c30cdb97a. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ITD541400338 — a six-check JSON result.
Eine kleine Nachtmusik in G Major, K. 525: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcc359547bb3c946526b13091bee12d98d9d9bace05117ff23558fe8749457ab. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ITD541400329 — a six-check JSON result.
Eine kleine Nachtmusik in G Major, K. 525: II. Romanza. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a81698ccb677d22e558846bffdb574e148ae8f3344969be8f24e2a4424968f5. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ITD541400330 — a six-check JSON result.
Eine kleine Nachtmusik in G Major, K. 525: III. Minuetto. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a59c5b8842d84bfa60cb8f05f7d59c65bcc1c8e005c350a13a1fd6d310e2b2b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITD541400331 — a six-check JSON result.
Eine kleine Nachtmusik in G Major, K. 525: IV. Rondò. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cf66e313e8cea65142f72fe63d1ed5c76710e47bd3fabf3e7ab8a3fdccfc5c1. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ITD541400332 — a six-check JSON result.
Symphony No. 40 in G Minor, K. 550: I. Molto allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de4e05aa35535f195d05d959834c3735e1d7e047437d06ec264ebc8e5bd8e2c. 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/ITD541500702 — a six-check JSON result.
Symphony No. 40 in G Minor, K. 550: IV. Finale. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a40fcf76130c021ea0310651dc0600d9c314efd876cb9be0f4ef0cc6c55e7d3. 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/ITD541500058 — a six-check JSON result.
Violin Concerto No. 5 in A Major, K. 219: I. Allegro aperto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb746c711fbba5b00a2f98e631247ab1e4c7c2cd07b7aa5eb4eeb2b6d628e1902. 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/ITD541500092 — a six-check JSON result.
Divertimento in D Major, K. 251: II. Minuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc69b6a88a9e591af7eae18642e2ba87e471f40f8c993f1dcc57bf7e1dd210568. 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/ITD541500152 — a six-check JSON result.
Divertimento in D Major, K. 251: III. Andatino - Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43bd6094cc0b1e7e9b72df77ddc25fac56a310e74de83abca4f7402f769a2ceb. 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/ITD541500153 — a six-check JSON result.
Divertimento in D Major, K. 251: IV. Minuetto con variazione
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963452f30ff87aa0fcbce486bbfa1322e4245a796d8b618ffa901e1ff421c6a9. 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/ITD541500154 — a six-check JSON result.
Divertimento in D Major, K. 251: V. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40f2e4331aab486757a25af6e9d697d9ffa765a4818ad4f1c8cec83277eaf22e. 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/ITD541500155 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed2020fbeb64715f7a9f8b05bf159c34f3d3e1106cc5bbd6dd26d2dd3b84b96d. 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/ITD541501497 — a six-check JSON result.
Flute and Harp Concerto in C Major, K. 299: III. Rondò. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bd76a080f69081631d661246b278b0939856eed5fcfaa64bf1c47cf0bf97547. 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/ITD541400352 — a six-check JSON result.
Flute Concerto No. 1 in G Major, K. 313: III. Rondò - Minuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32c31c37919ee35d6f830fd549988911c158c0bfc3a43de41369b178f7353dc5. 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/ITD541400348 — a six-check JSON result.
Collana musica sinfonica e strumentale: Serenata, K. 525 e Ouvertures di Mozart
Gorecki Symphony No. 3 'Sorrowful Songs'
Symphony No 3 op. 36 Lento e largo - Tranquilissimo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8c70d4908dec12c618f67750205272ef31de866ade4ea581ab9973c3ca54cf1. 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/USSJ11002105 — a six-check JSON result.
Górecki: Symphony No. 3 - Barber: Symphony in One Movement - Penderecki: Song of Cherubim
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c667556b9999c49ee9987063a9699bb74165190c757e736da7e6d1c2f64b829. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/SEWSJ1651228 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0505c4d54b657ae752d0a69837d60caf9a562a3ab0a55ab5da5031712d9e357b. 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/SEWSJ1651232 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d98509eff9417efb24a99c64cc820c657e78f3b7424be09abd7c837e0e49971. 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/SEWSJ1651234 — a six-check JSON result.
Antonio Vivaldi: Die 4 Jahreszeiten op. 8 - Der Winter I. Allegro non molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcfe746238a9b3ab3aad312178d3ec322acad092eb49d980e3f6e073124fac07. 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/DEA540001429 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc23af60409a19fe0e9874cbd0055a08e2e8a0ed92a0f37057cca3d44dbbfcb07. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITD541401498 — a six-check JSON result.
Symphony No. 3, Op. 36 "Symphony of Sorrowful Songs": I. Lento - Sostenuto tranquillo ma cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457cdec20abd8baeb7024ba49a1198ef7e2ac815a0bb7908dfeb83f9c72ebc24. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/SEWDL0517801 — a six-check JSON result.
Symphony No. 3, Op. 36 "Symphony of Sorrowful Songs": II. Lento e Largo - Tranquillissimo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d4de8e874928c16b7993bddf9f286ff4cac5ce6c662ba1a9caaeb091022a38. 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/SEWDL0517802 — a six-check JSON result.