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 0xc1aefc9cb957b160633fabdcf4d51ba2b1cecf1b33c34ec4ea73814833699975. Chain 2 (Bitcoin): anchored in block 953620 (2026-06-14T09:36:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e61609c-80c0-4298-8878-f9c8fdf21b68.json and https://artists.proofprofile.net/proofs/artist/1e61609c-80c0-4298-8878-f9c8fdf21b68.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Violin Sonata No. 1 in D Major, Op. 2: I. Adagio (18th c.)
Meditation Music: Meditative Music Across Ten Centuries
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 0x88c700ea5a85b8c16dc597db027ae3b4f8836cbe4f11091c33b362834cc8f743. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/ES7141500245 — a six-check JSON result.
Violin Sonata No. 10 in F Minor, Op. 2, RV 21: I. Preludio. Andante (18th c.)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd563f89d43857695694147d69bef650f9995a2e34642fa05537a4aa39115840. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/ES7141500247 — a six-check JSON result.
Violin Sonata No. 7 in A Major, Op. 1: IV. Largo (18th c.)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd14579d1c3a587788bd293d9f028269cee7aed04cb68dc30c57bfc727301ae4e. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ES7141500250 — a six-check JSON result.
Violin Sonata No. 4 in E Minor, Op. 1, K. 304: II. Tempo di menuetto (18th c.)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b2d9eb81f3bdd80d75383616c6f294a4ebf1375e2f6a845abe7dc10aca4412. 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/ES7141500252 — a six-check JSON result.
Violin Sonata in D Major, Op. 2 No. 1: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x429d3291a418b889e38d60497e96a931f6e0391a02a1c75282906286a86a0434. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/MX2831000152 — a six-check JSON result.
Violin Sonata in D Major, Op. 2 No. 1: II. Corrente. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x262951fe9a2307ed8ef40682289b27ef4fa2344fbb8713c7937eb994d8f13c42. 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/MX2831000153 — a six-check JSON result.
Violin Sonata in D Major, Op. 2 No. 1: III. Sarabande. Un poco andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x877c354f450306adcce9252958590e1c08d5702f0cd3b188ac2381dd969b5dad. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/MX2831000154 — a six-check JSON result.
Violin Sonata in D Major, Op. 2 No. 1: IV. Allemande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa29ef1cde8c0a2221ef412d656faed6c42266064c3aa93796216a2754aa32a97. 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/MX2831000155 — a six-check JSON result.
Violin Sonata in D Major, Op. 2 No. 1: V. Aria. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc5a55abbde32e7fc48ee4807ab0229c36a6ff66a292ec94ec7b208ba7e2f58c. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/MX2831000156 — a six-check JSON result.
Violin Sonata in D Minor, Op. 2 No. 2: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe329cc43c45fb9e199cdd377d05bec12b4d5a87fa00668cd6af5e4b75b4620fb. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/MX2831000157 — a six-check JSON result.
Violin Sonata in D Minor, Op. 2 No. 2: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ea3dbc8382c6d360062da68025fe3e602a697763dd71617b71be057cf1ff73. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/MX2831000158 — a six-check JSON result.
Violin Sonata in D Minor, Op. 2 No. 2: III. Largo e affettuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab45f66abd611657c5205c9c978b05bb2c13d428612f8de3d60585e90dedf4d5. 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/MX2831000159 — a six-check JSON result.
Violin Sonata in D Minor, Op. 2 No. 2: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7b294ec3bea04cfb81c2c0dc3eac7ea0cd2e61b4805458a89ea2a407bd8cc4. 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/MX2831000160 — a six-check JSON result.
Violin Sonata in G Minor, Op. 2 No. 3: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03dc30e2cc2594db8279b3a3cd6787979a4f009e0fc4581ab9dce49298300dc. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/MX2831000161 — a six-check JSON result.
Violin Sonata in G Minor, Op. 2 No. 3: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c5a62fec9f1bf1bdb5d5a020e6a25f04077fa42ef880d4968557380fc000643. 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/MX2831000162 — a six-check JSON result.
Violin Sonata in G Minor, Op. 2 No. 3: III. Corrente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02abcf6acc5e00fdb61316b2952bfeebc2b025dcb1fd470f974b255a3538296f. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/MX2831000163 — a six-check JSON result.
Violin Sonata in G Minor, Op. 2 No. 3: IV. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dbf63cb9711fc9e2743e77629c71ab71d60270b58356ff3a6e83295aa9f0dee. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/MX2831000164 — a six-check JSON result.
Violin Sonata in G Minor, Op. 2 No. 3: V. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a462e937a018dbac99f0a151df1402137b7e3a6bca283dd756b768153ce340a. 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/MX2831000165 — a six-check JSON result.
Violin Sonata in B-Flat Major, Op. 2 No. 4: I. Allemanda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14da645528ee55e1cafcae5b2683a92577b3887d1a15767d30b49aca580d3e33. 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/MX2831000166 — a six-check JSON result.
Violin Sonata in B-Flat Major, Op. 2 No. 4: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f1c4915f614c656d031bb50d5ee2ccff299e5c81c3e07285d3141a66a98d4f0. 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/MX2831000167 — a six-check JSON result.