David Shifrin (born January 2, 1950) is an American classical clarinetist and artistic director. Biography David Shifrin received early musical training at the Interlochen Arts Academy in 1963. He at
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 0xac9f6dc03425743955110cb11391ec849ed6af349486ce00bde9f7dc49e68fe0. 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/2a738d94-a251-4d2f-af21-583b59e4ce58.json and https://artists.proofprofile.net/proofs/artist/2a738d94-a251-4d2f-af21-583b59e4ce58.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Nielsen: Clarinet Concerto & Chamber Music with Clarinet
Clarinet Concerto, Op. 57, FS 129 (Arr. R. Orth for Chamber Ensemble) [Live]
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 0x81147f6505eda9800232e242442f5daa77a887c13a6bdfa862656a38e5c2fb1a. 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/USASX1652701.
Mozart Collection - Clarinet Concerto and Miscelaneous
The Chamber Music Society Of Lincoln Center
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Clarinet Quintet in A Major, K. 581: I. Allegro
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Clarinet Quintet in A Major, K. 581: II. Larghetto
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Clarinet Quintet in A Major, K. 581: III. Menuetto
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Clarinet Quintet in A Major, K. 581: IV. Allegretto con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed01efc275986704b6716598c0c130b5f591471bb46355d706f05ba76eafef0c. 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/DEF059704674.
Clarinet Quintet in B Minor, Op. 115: I. Allegro
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Clarinet Quintet in B Minor, Op. 115: II. Adagio
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Clarinet Quintet in B Minor, Op. 115: III. Andantino - Presto non assai, ma con sentimento
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Clarinet Quintet in B Minor, Op. 115: IV. Con moto
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Weber, C.M. Von: Clarinet Music - Opp. 33, 34, 48
Poulenc: Sextet, FP. 100 & Milhaud: La Création du Monde, Op. 81b & Saint-Saens: Septet, Op. 65
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Brahms, J.: Clarinet Sonatas Nos. 1 and 2 / Schumann, R.: Fantasiestücke
Mozart, W.A.: Clarinet Concerto in A Major / Clarinet Quintet in A Major
Klarinettenkonzert A-Dur, K. 622: 2. Adagio (Jenseits von Afrika): I. Allegro
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Klarinettenkonzert A-Dur, K. 622: 2. Adagio (Jenseits von Afrika): II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95fafc28e164025b341dadaa9d016736f0fc41a0fa5e0b6ae0f35c589df083ed. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USASX0802002.
Klarinettenkonzert A-Dur, K. 622: 2. Adagio (Jenseits von Afrika): IIII. Rondo: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40fd2a535e6a8ffe9cb2aadf4cf7355e8c5922110e0208709a520ca59dad4aa. 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/USASX0802003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc857ea6828f4887f39527e50a8d7d0289d99bbea9549123d078896e21f75ca7c. 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/USASX0802004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9004e2b33591fae1a26205f796a7e1d24481b429f0f1feb57dfb48f8756dcbf6. 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/USASX0802005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92cba4c95a6b7fdaae5d1fd8103c2176bd73123cb99fb3a5bb34f8882f46b63a. 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/USASX0802006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9950d89d56d1dedba9b9291a373e81f79f026a169eea5098488104a53404041. 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/USASX0802007.
Bach, J.S.: Brandenburg Concertos Nos. 1-6
Brandenburg Concerto No. 1 in F Major, BWV 1046: II. Adagio
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Brandenburg Concerto No. 6 in B-Flat Major, BWV 1051: I. [Allegro]
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Brandenburg Concerto No. 6 in B-Flat Major, BWV 1051: III. Allegro
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Brandenburg Concerto No. 5 in D Major, BWV 1050: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587d78402b59f81c43d07a34f49ce7322d23ca1bf55c8760392e7ba700d05ea8. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/USASX0818514.
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
Brandenburg Concerto No. 2 in F Major, BWV 1047: III. Allegro assai
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Would That I Were Edna St. Vincent Millay
Milken Archive Digital, Vol. 4 Album 7: Cycle of Life in Synagogue & Home – Sabbath Eve, Pt. 2, Individual Settings, Pt. 1
72 Camerata of Highland Park Senior High School
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a47355a439ba43cbdc071d68a5dbdd7d228d78a35c6c90c1e6370e16761a112. 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/HKI190955469.