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 0x3809697b10817e7946781e7e9c6bd2a540b1383fd6d3c402c1248cff0f579f00. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/666da9cd-2622-4bb3-9ad2-7e007972e464.json and https://artists.proofprofile.net/proofs/artist/666da9cd-2622-4bb3-9ad2-7e007972e464.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Farrenc: Piano Trios Nos. 2 & 4, Opp. 34 & 45, Variations concertantes sur un air suisse, Op. 20 & Violin Sonata, Op. 37
Piano Trio No. 4 in E Minor, Op. 45 (Version for Flute, Cello & Piano): I. Allegro deciso - Più moderato ed espressivo
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 0xb29f62e7a9c45ca5e771932da72a1a42e54a9f068fa652e770698088dd43b0bb. 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/DEB202253805.
Serenade No. 1 in D Major, Op. 11 (Original Version for Chamber Orchestra Reconstructed J. Rotter): I. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0bab4656898ef87342fa0114dd5823c329be2ee410ff7c4aa9be4e9e980fce0. 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/DEB262200101.
Serenade No. 1 in D Major, Op. 11 (Original Version for Chamber Orchestra Reconstructed J. Rotter): IIi. Scherzo. Allegro non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc52f59be78249f1d91a71879499add6fe8778b441f6601d347f7310b36715f7. 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/DEB262200102.
Bertini: Nonetto in D Major, Op. 107 & Piano Trio in A Minor, Op. 43 "Grand"
Piano Trio in A Minor, Op. 43 "Grand": IV. Rondo. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2153aad709fd9f580bf052b266b37bb63e3cbbca8b315fcc32a2d89688329c3. 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/DEB202036308.
Schoenberg: Chamber Symphony No. 1 - Zemlinsky: 6 Gesänge - Busoni: Berceuse élégiaque
Reger: Violin Concerto in A Major, Op. 101
Mahler: Das Lied von der Erde (Arr. A. Schoenberg & R. Riehn for Voice & Chamber Ensemble)
Mahler: Kindertotenlieder - Berg: Violin Concerto - 5 Altenberglieder
Schubert: Octet - Piano Trios Nos. 1 & 2
Farrenc, L.: Piano Trio, Op. 33 / Clarinet Trio, Op. 44 / Sextet, Op. 40
POULENC, F.: Sextet / Trio for Oboe, Bassoon and Piano / FRANCAIX, J.: Octet / Dixtuor (Linos Ensemble)
Haydn, F.J.: Divertimenti - Hob.Ii:41-43, 46, F7
Reinecke: Piano Quartets & Piano Quintet
Webern, A.: 6 Pieces, Op. 6 / Reger, M.: Eine Romantische Suite / Schoenberg, A.: 6 Orchester-Lieder
Mahler, G.: Symphony No. 4 / Lieder Eines Fahrenden Gesellen
Dvorak, A.: Serenade, Op, 44 / String Quintet, Op. 77
Prokofiev, S.: Oboe Quintet, Op. 39 / Overture On Hebrew Themes / Janacek, L.: Youth Suite
Haydn, J.: Cassation in F Major / Divertissement in B-Flat Major / Flute Quartet in A Major / Notturno No. 1 in C Major
Mozart, W.A.: Serenade No. 10, "Gran Partita" / Divertimento in E-Flat Major, K. 252
Mozart, W.A.: Zauberflöte (Die) / Così Fan Tutte (Arr. for Wind Ensemble)
Mozart, W.A.: Zauberflote (Die) / Cosi Fan Tutte (Arr. for Wind Ensemble)
Mozart, W.A.: Nozze Di Figaro (Le) (Arr. for Wind Ensemble)
Mozart, W.A.: Don Giovanni (Arr. for Wind Ensemble)
Spohr, L.: Nonet, Op. 31 / Beethoven, L. Van: Septet, Op. 20
Strauss Ii: Waltz Arrangements by Arnold Schoenberg, Anton Webern and Alban Berg
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1eee75452514a7681478336a444cc21e30325f8dfc9c25d3366c29fcad452f0. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/US2TL0932804.
Piano Sonata No. 16 in C Major, K. 545 "Sonata facile": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8db01bec7b443f599945670193cfccc88fcb2a018ef9c9cccb2b5757214f1a75. 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/US2TL0932822.
Classic Moods - Albinoni, T.G. / Handel, G.F. / Marcello, A. / Vivaldi, A. / Bach, J.S. / Mozart, W.A. / Beethoven, L. Van / Haydn, F.J.
The 4 Seasons: Violin Concerto in F Major, Op. 8, No. 3, RV 293, "L'autunno" (Autumn): II. Adagio molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x318febf1f5e8c59954f3b936fee694f8e85f856598eaec5d1c975a01b14ffb57. 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/US2TL0925504.
Classic Moods - Handel, G.F. / Bach, J.S. / Mozart, W.A. / Boccherini, L. / Telemann, G.P. / Besard, J.-.B. / Fasch, J.F.
Flute Sonata in E-Flat Major, BWV 1031: II. Siciliano (arr. for flute and harp)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c23e0d744747ddd21ec5041323de045cfc980d9f09766043a2b40436eb25873. 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/US2TL0926010.
Flute Trio No. 15 in G Major, Hob.XV:15: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e0ed558655e2928f5fa414d9fc48e9555a5589f6339b2386bb098082292ac71. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/US2TL0926804.
String Quartet in F Major, Op. 3, No. 5, Hob.III:17, "Serenade": II. Serenade: Andante cantabile (attrib. to Hoffstetter)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c738f8320fe4d6fc73445a76a13ddb371332fc98868152125ff31939125f3f. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/US2TL0926806.
String Quartet No. 62 in C Major, Op. 76, No. 3, Hob.III:77, "Emperor": II. Poco adagio, cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b495c5e0897f5e7828f934713233814a89563813425d79f54daca6be577b7f5. 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/US2TL0926810.
Rosen aus dem Suden, Op. 388 (arr. A. Schoenberg)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7585808811c33627554f4761bb91550f800607eb3a63f673e45f05e111242d97. 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/DEB260900082.
Mozart: Die Zauberflöte, Le nozze di Figaro, Don Giovanni, Cosi fan tutte & Die Entführung aus dem Serail