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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7066cb34964722dc691de3dd99f644e3b54604deb9ce35542a03ee528f154d02. Chain 2 (Bitcoin): anchored in block 953877 (2026-06-16T02:39:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/053395c7-1d6a-4dfb-9d07-6ff2921f7698.json and https://artists.proofprofile.net/proofs/artist/053395c7-1d6a-4dfb-9d07-6ff2921f7698.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Piano Trio in A Minor, Op. 50: II. Tema con variazioni: Tema (Andante con moto)
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b997697fb62c33d672816ad5048a69b8836a7cfe94f9ae86c5fce7904970c0. 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/GBYDS2300342.
Piano Trio in A Minor, Op. 50: II. Variation 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7bbece4d7f2af8a5c938f9dbd7e9ae1428fc3b09fa91a421da5c80da4390ccf. 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/GBYDS2300344.
Piano Trio in A Minor, Op. 50: II. Variation 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e372594abba3efe478420b4b9c6dd4dd1e47003a544897fe49c589b59d3fea. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBYDS2300345.
Piano Trio in A Minor, Op. 50: II. Variation 10
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce7c43d6798a0d416a3764e8b4764e1ff92ad21788464a4c0254be5bd992076e. 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/GBYDS2300352.
Piano Trio in A Minor, Op. 50: II. Variazioni Finale e coda
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc86bdfcb4b7c5934a703a223dc8aeb77e998806daf80fab2808dadb440b4da9. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBYDS2300354.
Piano Trio in A Minor, Op. 50: I. Pezzo elegiaco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e35f061b3880d35162e51c3261f7b6d43df90f3ad92f94ad5f754856ba0cd3c. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBYDS2300341.
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
Piano Trio in A Minor, Op. 50: II. Variation 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf93f199c3d9d68e67302f40e9b8bec8248f5703fb1a670e9dd8fe35a2d0ab57. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBYDS2300343.
Piano Trio in A Minor, Op. 50: II. Variation 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52559aff9fb31014014dc1916c10c5cfd0e328390533a1a68e1c740fde610d7b. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/GBYDS2300346.
Piano Trio in A Minor, Op. 50: II. Variation 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8d08694c5a05db3610b6f89e5e06a537812d06173d93db0d5892e039c8b1c6a. 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/GBYDS2300348.
Piano Trio in A Minor, Op. 50: II. Variation 7
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ec2892af17f4a9048b7b4413a4cb39c12f8fa339b8f7db221600dabae40ff50. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBYDS2300349.
Piano Trio in A Minor, Op. 50: II. Variation 8
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb242f934871fe339c6a6884e358b757626727e3febe30099d7bb51aa0563d97. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBYDS2300350.
Piano Trio in A Minor, Op. 50: II. Variation 9
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7bd88ec82ed3618dad2a44f537150d9a593059103e8d90fe1db3bca1aa7fbe3. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBYDS2300351.
Piano Trio in A Minor, Op. 50: II. Variation 11
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x439748b97edbfbbbdb60088d91ad40c3574b33a3608097f9f98c99142db077f2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBYDS2300353.
Chaconne in G Minor (Arr. for Violin & Piano by Ferdinand David) - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75e07a6cb218523a67c6641054812b189de61fe86e016f343128cb91ddf3fe1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBYDS2300233.
Memories - Russian Album for Violin and Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c3dc40364852bed2fadeaa705aeac785d3a9106b0f85759821683765cb43985. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC9802354.
Caledonian Market (Excerpts): No. 6, Musical Box
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd64e3de32ebe4ee499cfdd28dec71d50c89c8e360c59ce30c9a3b3e9cec28b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBYDS2200098.