thumb|Willem de Fesch Willem de Fesch (; 1687 in Alkmaar – 3 January 1761) was a virtuoso Dutch violinist and composer. The pupil of Karel Rosier, who was a Vice-Kapellmeister at Bonn, de Fesch late
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 0xaaf4eed99f9dbb370dfb01f4712cf56cef3db23998e0324609954341aae8ea8d. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/067c5fca-b829-41d9-9d05-fb4dc6741d93.json and https://artists.proofprofile.net/proofs/artist/067c5fca-b829-41d9-9d05-fb4dc6741d93.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto Grosso I in G Minor, Op. 3: IV. Presto
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 0x6f9eb293dd35380c34b024e1eadb3b7ac4d71ec40dedca1878aa7922afe01078. 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/NLY332100547.
Concerto Grosso III in F Major, Op. 3: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84d9a9c93abae2ee8dc36019cb9863f75b371e472dbf7d5e06cd3fb87f86ba3. 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/NLY332100554.
Concerto Grosso III in F Major, Op. 3: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75fc9304be78982f2bfd406d19cde56a71656a9636947d8473a420e4a345b4cc. 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/NLY332100555.
Concerto Grosso IV in E-Flat Major, Op. 3: II. Alle Breve
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92b14af14729b9a6611506d9a457950698b9854a132b462614bafde8817d105. 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/NLY332100560.
Concerto Grosso V in D Major, Op. 3: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ebe16a770de8dc9043daecafd8b7933d84b9d17ea975ecb6fe73caa5d1b2ed. 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/NLY332100564.
Concerto Grosso V in D Major, Op. 3: V. March
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16b454f9f92fdadd16ef4f8ec10e156429323dfc673f414553bff945ab658349. 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/NLY332100568.
Concerto Grosso Vi in F Major, Op. 3: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2178c084f4f8d87d5db88ff89c331aed25dfb56aa737845bbd0097087ace8cb0. 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/NLY332100569.
Concerto Grosso Vi in F Major, Op. 3: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffbfd5cacde62e054e637f322e171d2d5bb6a6b3b17a1483b184c66283e2e937. 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/NLY332100571.
Concerto II in B-Flat Major: II. Da Capella. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3bb22c3f83e7bc550aaaaf52cf97030be6f70d91a58486ac8432284befa9875. 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/NLY332100578.
Concerto II in B-Flat Major: III. Largo Affettuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5499f0dd24ea2684226e7c753b2ee42533190647b98b7ba7730492a3814dee21. 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/NLY332100579.
Concerto II in B-Flat Major: IV. Allegro Moderato Staccato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e4a0807ed8890732afc8544b19a86d19a77f097ca0ba7e9974afaf020f58190. 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/NLY332100580.
Concerto II in B-Flat Major: II. Largo Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f8080ffb6ffca460826d2818d0ca542457b3b3b237a9ed1bfbf6cee7ef1ee19. 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/NLY332100582.
Concerto IV in G Major: III. Largo Affettuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1104cdeba714fd2ca5c93f9ef69c0c56278ec01f854a04987750ff450ca18c6. 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/NLY332100586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xead6f9b12b01225ae66e1ee0773af24bc604997754234ba22b0f1044c154ffe8. 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/NLY332100587.
Concerto V in F Minor: IV. A Tempo Giusto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd48b70de1eb12d465a9f72b74ca716ba901eb8034dae429426c75d584e02606f. 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/NLY332100591.
Concerto Vi in E-Flat Major: I. Affettuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cdd337ee799de17705b45e17fa844678a2f2d2de948b98163fcbbf139621c8f. 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/NLY332100592.
Teleman, Loeillet & Others: Recorder Works
Han de Vries: The Almost Last Recordings
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x185fecf691eb5081d10f7a13e15a86c3401f28c5b048b169d06c6ba8974993ee. 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/NL3UC2301862.
A Cavalier's Tour (Through Baroque Europe)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79fd3a32fa798cc31cd4c9a58c6961c9a73b9ab29cdedefb85de03a6c11efeec. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/DES380020610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf84d3b44d0637b9662e7f3bcb8306fb45f2a7dac7d2831e14f8333184014cc9a. 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/DES380020620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac8a8151ab5db8e3d4045c651fe006a5e9a40aae7607ec482c085668b49f3ac. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DES380020635.
Een Muzikale Anthologie Der Noordelijke Nederlanden
A Musical Anthology of the Northern Netherlands
Orpheus with His Lute: Music for Shakespeare from Purcell to Arne (English Orpheus 50)
Willem De Fesch: VI Concerti Opera Quinta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebe50888dbd605d45bd05e5d12fbb1cb5299f3df8d90fb95ec30d6a609ca08e2. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DECP69006001.
Cello Sonata in E Minor, RV 40: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f241c3ceb5141f7a03e56dc6f785b60821592d4579940770cfda674287cdf71. 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/DECP69111002.
Cello Sonata No. 1 in G Minor: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f1438044c540d42a1615527ee187ff886c9c8e04ca1958170d34f0fca04d3e. 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/DECP69006003.
Cello Sonata in E Minor, RV 40: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00876d981ac45addcfc375294cd2ba9bee7fb24be992db13a787ee07f078f9c9. 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/DECP69111003.
Cello Sonata in E Minor, RV 40: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7acafa74afbf475e1bc7bda8f0cc224446d6873c89020dee1acf40d4fe4ae1b. 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/DECP69111004.
Cello Sonata No. 1 in G Minor: VI. Ricercar II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657448974609739e95e0bd1307dd59a8e8e5f75492da64bd01b764b5a5e227b7. 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/DECP69006006.
Cello Sonata No. 1 in G Minor: VII. Canon à due violoncelli, uno entra una battuta doppo l‘altro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabf5988051d4590ab41fea9c1b65539763a20cf40d6f81902ccb6981c099c98c. 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/DECP69006007.
Cello Sonata in C Major, Op. 5 No. 3, H. 105: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c2948b9836ead33df2ef12204c2e469454b23eb0dbdf99ea14faf935d4cb229. 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/DECP69111013.
Cello Sonata No. 2 in A Major: IV. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc4a93def76e30cddbb61ad3eb5b49a6e4b5c939a42685ee028987218b889f8. 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/DECP69006014.
Cello Sonata No. 2 in A Major: VI. Ricercar V
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e27bb4b18d088f9881da7b9315a29b1f746df42c1e9b4a7a291163c5e71df5a. 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/DECP69006016.
Cello Sonata in G Minor, Op. 1 No. 4: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f7208f5f2ae3b3d2f12bd1a60d2471d0c1bb0a149ca9abca825dfe5fa387d8. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DECP69006017.
Cello Sonata in D Minor, Op. 5 No. 2, H. 104: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90dd673643793ff4461dd1651c58839ba2b105da3c51a38737202b57a1165fd7. 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/DECP69111017.
Cello Sonata in G Minor, Op. 1 No. 4: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3bef4012709ceec15e4631e4a8647d208978fe7236eeef8ebd129be1dbff65c. 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/DECP69006018.
Cello Sonata in D Minor, Op. 5 No. 2, H. 104: II. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf11959d65d9c1b7d9408e0bc7a496c4614b9ef9be785fa4c3158172faebace. 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/DECP69111018.
Cello Sonata in G Minor, Op. 1 No. 4: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f4acb70f6d38fb2293c5065dcbc3e7d5e124f61a6151737122e122f54b2e52a. 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/DECP69006019.
Cello Sonata in A Minor: III. Minuettos I & II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf20bbc848d0ed8c5fb200ec59eabab8b75161dcc0f96f6dc2e77d0edd23a4a22. 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/DECP69006023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13bf13671b26b31da04a6e82e8c3f7cccb49e3dc5ff06cfbfd707e380cd0ebcf. 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/DECP69006024.
Cello Sonata No. 1 in D Minor: IV. A tempo guisto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2aaa5eec71389a634a515e0dc52fdb104cfceb2797b4bde16d97f0c192d88d5. 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/DECP69006027.
Cello Sonata in A Minor, Op. 13 No. 6: II. Alla breve
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85cb6fae415043d6e850e353df6472134e19fa6e31e4b635502951b814e6de5d. 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/DECP69006029.
Cello Sonata in A Minor, Op. 13 No. 6: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b62b8baac9bbbdd2f285c1ce1f3f38b2e25b442ad2e54b44804dcc1d27944b1. 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/DECP69006030.
Cello Sonata in A Minor, Op. 13 No. 6: I. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0626f9ed6e45d157617a227b59f30586a445db1fb241b71397b618f2b55de8f. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/DECP69006028.
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
Cello Music - Gabrielli, D. / Bononcini, G. / Scarlatti, A. / Fesch, W.
Willem de Fesch: Concerti Grossi & Violin Concertos
Concerto Grosso in C Major, Op. 3: No. 1
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Concerto Grosso in D Major, Op. 10: No. 4
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Concerto Grosso in E Minor, Op. 3: No. 5
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Violin Concerto in C Minor, Op. 5: No. 5
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Willem de Fesch: Seis Sonatas para Violoncello y Clavecín
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Bachianas Brasileiras: No. 5, Aria for Cello and Guitar
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Sicilienne (Transcribed for Cello & Piano)
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Les Folies d'Espagne (Transcribed for Cello & Harpsichord)
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Détail pour violoncelle baroque et clavecin
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Sicilienne pour violoncelle baroque et clavecin
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Music for the Moment: Classical Relaxation
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Amazing Duo II: The Berlin Philharmonic Duo
Lully, De Fesch, Mozart, Bach, Rameau, Rosenmüller, Viviani, Vitali: Airs de trompette (17th and 18th Century Music for Trumpet, Trombone and Organ)
Concert pour deux violoncelles (Mono Version)