The Cypress String Quartet was a professional classical chamber music ensemble founded in San Francisco, California, in 1996. At the time of its disbanding in June 2016, the quartet's members were: C
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 0x05b81da03f75ac2c1a6ebb6197906441352ba4bc5f9abff02b820ef7d45cfc7b. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de859eaa-de52-4baa-9a38-fa655f46abd8.json and https://artists.proofprofile.net/proofs/artist/de859eaa-de52-4baa-9a38-fa655f46abd8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Daniel Asia: String Quartets Nos. 1, 2 and 3
Beethoven: The Early String Quartets, Op. 18
Beethoven: The Middle String Quartets, Opp. 59, 74, & 95
Schubert: String Quintet, D.956; Quartettsatz, D.703
String Quartet No. 12 in F Major, Op. 96 "American": II. Lento
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 0x491851f316582cb932e551a7b95022de8525470d42b8bd8834028873b481b5a0. 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/GBELX1304887.
String Quartet in B Minor, Op. 11: II. Molto adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d0a3090844d1911a6e3a16362f475b41502504aca6bfad7a9840d772f95975. 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/GBELX1304894.
Dvořák: Cypresses for String Quartet; String Quartet No. 13, Op. 106
Cypřiše (Cypresses), B152: No. 1: Já vím, že v sladké naději [I know that on my love]: Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x610c7ce84617e7e76a763c54f4c2a3293ca6d501f89cc48f36d3263db4bec99d. 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/GBELX1304575.
Cypřiše (Cypresses), B152: No. 2: V tak mnohém srdci mrtvo jest [Death reigns]: Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6c4ed3af3ad656efd55963aa3758c770e235847c69a69c9932fbc865df8b5d7. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBELX1304576.
Cypřiše (Cypresses), B152: No. 3: V té sladké moci očí tvých [When thy sweet glances]: Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26f97642735d1de47ace69d747a2ebb4bcc63f4e0493c2ac44cad96c7bbc7049. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GBELX1304577.
Cypřiše (Cypresses), B152: No. 4: Ó, naší lásce nekvete to vytoužené štěstí [Never will Love lead us]: Poco adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a7dfb637d92013b0df90212019e19d4c71fb724e625e5bd8e09d6675a1e0546. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GBELX1304578.
Cypřiše (Cypresses), B152: No. 5: Zde hledím na tvůj drahý list [The Old Letter]: Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29326e1e57b2d5a0df1941ccd99f7618b13eb5a623da460eeada6a6dfe44744b. 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/GBELX1304579.
Cypřiše (Cypresses), B152: No. 6: Ó, zlatá růže spanilá [You are my glorious rose]: Andante moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3df8d4c4fed77eb61046641bdc63682f39a3a5383e6c7732c9a935f137c3df. 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/GBELX1304580.
Cypřiše (Cypresses), B152: No. 7: Kol domu se teď potácím [I wander oft past yonder house]: Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c61aeec06c7692346f8a3a5eedf331784a02eb1b58d1efd40843a0c4a831c88. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/GBELX1304581.
Cypřiše (Cypresses), B152: No. 8: Zde v lese u potoka [In deepest forest glade]: Lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d06e726ad8c38ab98d81e5051fd0ddc64a0c5c20c612578d63f38e977296ee. 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/GBELX1304582.
Cypřiše (Cypresses), B152: No. 9: Ó duše drahá jedinká [Thou only dear one]: Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x840d3a16ef786ab21802fd76283d31941d2cab3e8051c4aa7d2ad4f22d4f6927. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GBELX1304583.
Cypřiše (Cypresses), B152: No. 11: Nad krajem vévodí lehký spánek [Nature lies peaceful]: Allegro scherzando
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25323f98674829871f27a630404575ff506f065bb881d65d4fad64dcea4ead23. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBELX1304585.
How She Danced: String Quartets of Elena Ruehr
Lees, B.: String Quartets Nos. 1, 5 and 6
Higdon: Piano Trio / Voices / Impressions
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce3342bd3e031ae59fc8beccbfef381ff65e3cfe8444ac381e6430c99b47d20. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/HKI190604001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22520ea5ae091f4c48a945bce9de8d0272b236db80c3a99f2755c8ea591a7c08. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/HKI190604002.
Cypress String Quartet: Debussy, Suk, Cotton
Power to the Women: The Best of Female Classical Composers
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x983638838843d382e248b4b157128663b9906a080e54689b086b3769c8cd61e4. 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/HKI191090201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8013fe5add18f9683b6326f701fb03070495c89f1d69130fc5fdfc87ebb6dc53. 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/HKI199612801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eddfb5caa17a98b3feebce909369bf779f6f1f6173ba0ee1f4ff1ce716ce4ea. 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/HKI199295204.