Alexander Vasilievich Ivashkin (), (17 August 1948 – 31 January 2014) was a Russian cellist, writer, academic and conductor. He was a professor of music and the Chair of Performance Studies at Goldsmi
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 0x541a9ed6130c21ff5fe531c1a33b5b22897cc49ccae66d548727242b959a74ae. Chain 2 (Bitcoin): anchored in block 954638 (2026-06-21T03:45:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3bce896-00bb-49bd-8d33-1542f1926637.json and https://artists.proofprofile.net/proofs/artist/d3bce896-00bb-49bd-8d33-1542f1926637.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Britten: Complete Music for Cello Solo and Cello and Piano
Shostakovich: Cello Concertos Nos. 1 & 2
Schnittke: Symphony No. 6 & Concerto Grosso No. 2
Rachmaninoff: Complete Works for Cello and Piano
Prokofiev: Complete Works for Piano and Cello
Oboe Concerto in A minor, RV. 461 : I. Allegro
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 0x3c0353e77f5cf385028767c5a72836d8358b938007af5bcbe75af270304197e8. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V81085756 — a six-check JSON result.
Oboe Concerto in A minor, RV. 461 : III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50294543d957703b018b4dad48c3a1fd0a036503c4630c6637ed972baa16b66b. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V81085758 — a six-check JSON result.
Oboe Concerto in C minor : I. Introduction
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c059aa671ed9812a154a63ca6d12111fa377099c9d7837870a5c968aa0d659c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V81085759 — a six-check JSON result.
Oboe Concerto in C minor : III. Siciliana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32bfda04d3ec4cc903afd59823e5724c73cf69ff86d7cbcfe03a3588ae6d02a4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V81085761 — a six-check JSON result.
Boccherini, Haydn: Cello Concertos & Divertimento
Cello Concerto in B-Flat Major : II. Adagio non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3efa73fa914f86ef684760a62d342f51600b9899bbb1c72af1fe913ea3fd799. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V81080662 — a six-check JSON result.
Cello Concerto in B-Flat Major : III. Rondo, Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5bf937d5ae19fab27c9fef8206f5f8b47915f27d6ac28268e891ce4593df9a5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V81080663 — a six-check JSON result.
Myaskovsky: Symphony No. 27 & Cello Concerto
Symphony No. 27 in C Minor, Op. 85: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe964f947edd12f3e4ace7acca69960be162d10d15334846e3e4cdafbea1ae7c0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD0209002 — a six-check JSON result.
Prokofiev: Symphony-Concerto & Symphony No. 2
Gubaidulina: In croce, Ten Preludes & Quaternion
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x652d0ddef8900cf57f5dc8b12815b83cab076015c5e6bd5aaf2db4057740db87. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD0111511 — a six-check JSON result.
Prokofiev: Cello Concerto in E Minor & Concertino in G Minor
Alexander Ivashkin plays Prokofiev Cello Concertos & Sonatas
Cello Concerto in E Minor, Op. 58: I. Andante
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Roslavets: Cello Sonata Nos. 1 and 2, Meditation, Five Preludes & Dance of the White Maidens
Schnittke: Symphony No. 7 & Cello Concerto No. 1
Shostakovich: Overture, Two Preludes & Orchestrations of Tishcenko: Cello Concerto No. 1, Schumann: Cello Concerto
Tcherepnin: Complete Music for Cello & Piano
Under the Southern Cross: New Music for Solo Cello by Australian and New Zealand Composers
Schnittke: Cello Sonatas Nos. 1 & 2, Musica nostalgica & Epilogue from Peer Gynt
Grechaninov: Symphony No. 4, Cello Concerto & Missa festiva
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f468f7679d41ce23f88afa875ed3eff6521de9a4832f51163380e623db25c3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD9709409 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef06f05aaae17d17c6fbce2ef1890221cc4a254c36ae9feea1f394d82b54031f. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD9709410 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x217e41d366c99322ed35cbb1a62c2d977809ec25645b0765e024e1fe766f0577. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD9709411 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe29b200d74172ee46a6cf1d2d18911471f446fa9008f5c9aca59fa6d3b49833. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD9709412 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06f0ae3bf156ae800b7f3b27febc5b03e34add16c42dd8628eba8cd639ca4e58. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD9709413 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde33b474ca90893759551810bc38aa273c14f76082f5714de7938f259eda6e2d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD9709414 — a six-check JSON result.
Shostakovich: Concertos for Cello and Orchestra Nos. 1 & 2
Prokofiev: Complete Music for Cello and Piano
Schnittke: Piano Quintet / String Trio / Stille Musik
The Best of Baroque, Vol. 1 (50 Golden Moments of Classical Music)
The Best of Baroque, Vol. 2 (50 Golden Moments of Classical Music)
Classical Composers Collections: 50 Best of Mozart
100 Favorite Classical New Year Concerts