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 0x6a4312d3e2974c2bd038d11d11b5953db19bcf792f9269848f7e83bbd2e91404. 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/1fd5fad3-2b52-4e9e-8836-5aafa624005e.json and https://artists.proofprofile.net/proofs/artist/1fd5fad3-2b52-4e9e-8836-5aafa624005e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Nocturne (Arr. for Violin and Orchestra by Matthias Spindler)
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 0xd58315dda42fc4104e4a7533c27b76c0607200201c0cb9710331567a5d0d9128. 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/USSM12305343 — a six-check JSON result.
Violin Concerto No. 1 in E Major, RV 269 "Spring": Violin Concerto No. 1 in E Major, RV 269 "Spring"/I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cb348f8016369fd285b6da704d76737eee221bb9cc884b6388ce4c9b897074c. 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/USSM12305335 — a six-check JSON result.
Violin Concerto No. 1 in E Major, RV 269 "Spring": II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973c942c1fcb4f81b80c2d9be48f7c839ba049c4a7e3307091eb9d9b357bf9a9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12305336 — a six-check JSON result.
Violin Concerto No. 1 in E Major, RV 269 "Spring": III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6386d3a7682d43eeedf2e68a6576832a524855537ca03150d0235f9f83a4cfe4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12305337 — a six-check JSON result.
El Cant dels Ocells (Arr. for Violin and Orchestra by Matthias Spindler)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc990d2e6c4007318b1b1a07fe7d195fe0cab31995737289b4f081313d131435f. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/USSM12305338 — a six-check JSON result.
Violin Concerto No. 2 in G Minor, RV 315 "Summer": I. Allegro non molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17342f7a3e0271fabf21d3005bfd4b66ad4258ec7a44536be10fb4bcad9612ce. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12305340 — a six-check JSON result.
Violin Concerto No. 2 in G Minor, RV 315 "Summer": II. Adagio - Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27dd21f70809775eb851c065430fbdeb913a3a52998c07b1a83cbf31ded214df. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12305341 — a six-check JSON result.
Violin Concerto No. 2 in G Minor, RV 315 "Summer": III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f4747d3d64ae2e13f96d306f3d516b81b762133fcd78bb95599dab42a6eb075. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12305342 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58315dda42fc4104e4a7533c27b76c0607200201c0cb9710331567a5d0d9128. 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/USSM12305343 — a six-check JSON result.
Violin Concerto No. 3 in F Major, RV 293 "Autumn": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11150a5454afa39c8c4e6a48b1abc5efedfddb82b3f6cb12a89c6b47e8b86fb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12305345 — a six-check JSON result.
Violin Concerto No. 3 in F Major, RV 293 "Autumn": II. Adagio molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac2caeed5015e7c5bc0e9dce3ca76a600a16fec3bfaff76870f19fd496c4e67. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12305346 — a six-check JSON result.
Violin Concerto No. 3 in F Major, RV 293 "Autumn": III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ff75f43ed35d98926ecd50efa762bf4b147d6f1cf173c4e879901462db1168. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12305347 — a six-check JSON result.
The Seasons, Op. 37b: X. October "Autumn Song" (Arr. for Violin and Orchestra by Matthias Spindler)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7a568aab476add435ebb4a32ea84cb044ab71b6805ba14b2c423085b0d7d2b4. 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/USSM12305348 — a six-check JSON result.
Violin Concerto No. 4 in F Minor, RV 297 "Winter": I. Allegro non molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc93028f10cc9bb393b2d20ff0f0df28ce1ddf05415901f6e8de1dbc2efa4046. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12305350 — a six-check JSON result.
Violin Concerto No. 4 in F Minor, RV 297 "Winter": II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf705e8baf5e1e7e1399fde502ab8e41e52ef2ebc996e174be69dc87537d585e9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12305351 — a six-check JSON result.
Violin Concerto No. 4 in F Minor, RV 297 "Winter": III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec7b6f8cf22346786ab7f658411a43370c1c28b1a9b1a41d7e5cc57490ad558. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USSM12305352 — a six-check JSON result.
Violin Concerto No. 2 in G Minor, RV 315 "Summer"/III. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f4747d3d64ae2e13f96d306f3d516b81b762133fcd78bb95599dab42a6eb075. 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/USSM12305342 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7a568aab476add435ebb4a32ea84cb044ab71b6805ba14b2c423085b0d7d2b4. 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/USSM12305348 — a six-check JSON result.
Violin Concerto No. 1 in E Major, RV 269 "Spring"/I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cb348f8016369fd285b6da704d76737eee221bb9cc884b6388ce4c9b897074c. 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/USSM12305335 — a six-check JSON result.