thumbnail|250px|Steinberg with Tiger Woods in 2014. Mark Steinberg is a sports agent who has been representing top golfers since 1992. He is a partner at Excel Sports Management. where he heads the pr
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 0xccbf8f4c7d19319d25cb6429e0378f3dbba8cbdb3dca09f28e51f134c462bbd4. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/575ea2cb-792f-4a33-acc0-bf924d7eae9a.json and https://artists.proofprofile.net/proofs/artist/575ea2cb-792f-4a33-acc0-bf924d7eae9a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sonata for Piano and Violin in F, K.377: 1. Allegro
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 0xa65e5cdc455f8acf867cbb3cbc239df701cb9e296b29debb538fa746b56e28fd. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0401681.
Sonata for Piano and Violin in F, K.377: 2. Tema (Andante) con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x948b887c3387b09a386f9932d4e1c4667e951c5616d7231ce2edf0d98cea300b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0401682.
Sonata for Piano and Violin in F, K.377: 3. Tempo di menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd069feaf18c45c586e6b995c5ff85b2b0642e9c26bd4538f76ac1df5c710b421. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0401683.
Sonata for Piano and Violin in C, K.303: 1. Adagio - Molto allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ff387c29f2a9b26d6c5cab59f3694de6e55bccfe82fa2f9048eb60d0378f53e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0401711.
Sonata for Piano and Violin in C, K.303: 2. Tempo di minuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147d5c4c8301faa53ca19db298ad9771eab8c05c13577d5dc1a463abc066bd22. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0401712.
Sonata for Piano and Violin in E minor, K.304: 1. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9dc11c92e2909e34a953695fa0720620533a68bf95fd26bb958f801f8900c86. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0401741.
Sonata for Piano and Violin in E minor, K.304: 2. Tempo di minuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x253ce723cb698044394f91d7302973e81cf0d42a3607003d6c0faa8e2bd0de2e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0401742.
Sonata for Piano and Violin in A, K.526: 1. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0750b226ccf2582d4ce77368efbd5659e72a849a8aec12ab857e34991d54a5c5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0401771.
Sonata for Piano and Violin in A, K.526: 2. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e9a9a193828d16b75c50405ce687b7a6243113014d4849e0cb68636840e37b. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0401772.
Schumann: A Schumann Salon Concert Performed on Period Instruments
Sonata for Keyboard and Violin in F Major, K. 30: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad5e428400f7a035cb495b847b7e7f75ebc8fc147d226365135e21c8186eb51f. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507400153.
Cowell: Homage To Iran / Piano Pieces / Set of Five / Six Casual Developments / Two Songs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x207c560956d49a41a3402cd3c1f1f18b36237de5fbc4e84174b5dd99013520dd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190351901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x434caad46836a09920df9eaab2d661929fac5285ceae5f6f17361f66618ebbb4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190351910.
Lecuona: Complete Piano Music (The), Vol. 5
Nancarrow: Pieces for Small Orchestra / Tango? / String Quartet No. 1
Symphony No. 40 in G Minor, K. 550: 1. Molto Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8a4d359bd5fc7d214b2d3d434f4fc2aa22a10330a64e2eddc93b9dab415658. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF058903156.
Mozart: Don Giovanni Medley, K.527 - Medley
Members of the Netherlands Wind Ensemble
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a4a4009ae932377153d5bf64f0d7fd5e8e92ffc681af87590ecc032b7e2573. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA507301340.
Eine kleine Nachtmusik (A Mozart Medley) - Instrumental
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6043857a077e20b7bf4cb5e3636cf0ce19db00a4161596d4bed859fd780b45. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEUM70903369.
Piano Concerto No. 21 in C Major, K. 467: 2. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e889846605b3966dd078410fc120599696059de206092f85e3c3c9a1e14099. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF056100245.
Sierra: New Music With A Caribbean Accent
Wuorinen: Ashberyana / Fenton Songs I and Ii / Josquiniana
Kirchner: Duo for Violin and Piano / Piano Trio / Piano Sonata / Triptych