The London String Quartet was a string quartet founded in London in 1908 which remained one of the leading English chamber groups into the 1930s, and made several well-known recordings.Woolf, Jonathan
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 0xd88f4122f14f8d2c0c18d6be6332e1cf7dd8ceab4118dcb0f2009f2b77092cb4. 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/bed41a59-5258-4b8a-8a71-cdaec237bd5c.json and https://artists.proofprofile.net/proofs/artist/bed41a59-5258-4b8a-8a71-cdaec237bd5c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Best of İdil Biret: Selections from the Complete Studio Recordings
Keyboard Suite No. 1 in B-Flat Major, HWV 434: IV. Minuet (Arr. W. Kempff for Piano)
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 0x03a88d9ea3759db29ebed9bbc4a1ad53d931338e49365f485ea68a026ef73d24. 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/HKI199113808.
The London String Quartet: 1917-1951 Recordings
Boccherini: Guitar Quintets Nos. 5 & 6 - Guastavino: Jeromita Linares
Quintet No. 5 in D Major for Guitar and Strings, G. 449: II. Menuetto - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15db8a54c1933b94c6644e2ed55181222ad0a949b7d39c7f382bee6003b41a7f. 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/USSM11105992.
Quintet for Guitar and Strings No. 6 in G Major, G. 450: IV. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7fab32890d582869299af498e50f06cdc252284155388d9a50fbdf171d954b1. 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/USSM11405627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3483c6586185a351639a07889faf83e27954a3117eeb490dbdc5223050adfd7. 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/HKI191002501.
The Clarinet: Historical Recordings, Vol. 2 (Recorded 1901-1940)
Vaughan Williams Anniversary Collector Edition