Leonid Kogan
type: MusicGroup
genre: chamber music
description: Leonid Borisovich Kogan (; ; 14 November 1924 – 17 December 1982)Boris Schwarz and Margaret Campbell. "Kogan, Leonid." Grove Music Online. Oxford Music Online. Oxford University Press, accessed Novemb
popularity: 19
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album: Mendelssohn & Beethoven: Violin Concertos
  type: MusicAlbum
  date published: 2018-05-25
album: Tchaikovsky: Trio pour piano, violon et violoncelle & Quatuor à cordes No. 3 (Les indispensables de Diapason)
  type: MusicAlbum
  date published: 2016-10-28
album: The Art of Leonid Kogan: Chamber Music
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  date published: 2024-12-12
  track: Telemann: Canon-Sonata for Two Violins in G Major, TWV 40:118: I. Vivace
  track: Telemann: Canon-Sonata for Two Violins in G Major, TWV 40:118: II. Adagio
  track: Telemann: Canon-Sonata for Two Violins in G Major, TWV 40:118: III. Allegro
  track: Brahms: Violin Sonata No. 1 in G Major, Op. 78: II. Adagio
  track: Leclair: Sonata for Two Violins in G Major, Op. 3 No. 1: I. Allegro
  track: Leclair: Sonata for Two Violins in G Major, Op. 3 No. 1: III. Allegro
  track: Locatelli / Arr. Ysaÿe: Violin Sonata in F Minor, Op. 6 No. 7 "At the Tomb": III. Lento
  track: Leclair: Sonata for Two Violins in C Major, Op. 3 No. 3: III. Allegro
  track: Brahms: Violin Sonata No. 2 in A Major, Op. 100: II. Andante tranquillo - Vivace
  track: Ysaÿe: Sonata for Two Violins in A Minor: I. Poco lento maestoso - Quasi moderato
  track: Bach: Violin Partita No. 1 in B Minor, BWV 1002: V. Sarabande
  track: Paganini: Cantabile for Violin and Piano in D Major, Op. 17
  track: Brahms: Violin Sonata No. 1 in G Major, Op. 78: I. Vivace ma non troppo
  track: Brahms: Violin Sonata No. 1 in G Major, Op. 78: III. Allegro molto moderato
  track: Leclair: Sonata for Two Violins in G Major, Op. 3 No. 1: II. Allegro ma poco
  track: Locatelli / Arr. Ysaÿe: Violin Sonata in F Minor, Op. 6 No. 7 "At the Tomb": I. Lento assai e mesto
  track: Locatelli / Arr. Ysaÿe: Violin Sonata in F Minor, Op. 6 No. 7 "At the Tomb": II. Allegro
  track: Locatelli / Arr. Ysaÿe: Violin Sonata in F Minor, Op. 6 No. 7 "At the Tomb": IV. Tempo moderato
  track: Leclair: Sonata for Two Violins in C Major, Op. 3 No. 3: I. Adagio - Vivace
  track: Leclair: Sonata for Two Violins in C Major, Op. 3 No. 3: II. Adagio
  track: Ysaÿe: Sonata for Two Violins in A Minor: II. Allegretto poco lento
  track: Ysaÿe: Sonata for Two Violins in A Minor: III. Allegro vivo e con fuoco - Moderato amabile
album: The Italian and Spanish Music
  type: MusicAlbum
  date published: 2012-01-01

Telemann: Canon-Sonata for Two Violins in G Major, TWV 40:118: I. Vivace
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Telemann: Canon-Sonata for Two Violins in G Major, TWV 40:118: II. Adagio
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Telemann: Canon-Sonata for Two Violins in G Major, TWV 40:118: III. Allegro
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  date published: 2026-07-08T03:22:41Z
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Brahms: Violin Sonata No. 1 in G Major, Op. 78: II. Adagio
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Leclair: Sonata for Two Violins in G Major, Op. 3 No. 1: I. Allegro
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Leclair: Sonata for Two Violins in G Major, Op. 3 No. 1: III. Allegro
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Locatelli / Arr. Ysaÿe: Violin Sonata in F Minor, Op. 6 No. 7 "At the Tomb": III. Lento
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  date published: 2026-07-08T03:20:19Z
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Leclair: Sonata for Two Violins in C Major, Op. 3 No. 3: III. Allegro
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  date published: 2026-07-08T03:53:27Z
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Brahms: Violin Sonata No. 2 in A Major, Op. 100: II. Andante tranquillo - Vivace
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  date published: 2026-07-08T03:53:27Z
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Ysaÿe: Sonata for Two Violins in A Minor: I. Poco lento maestoso - Quasi moderato
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Bach: Violin Partita No. 1 in B Minor, BWV 1002: V. Sarabande
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  value: 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

Paganini: Cantabile for Violin and Piano in D Major, Op. 17
type: MusicRecording
duration: PT4M10S
duration ms: 250960
explicit: false
by artist: Niccolò Paganini
by artist: Leonid Kogan
by artist: Andrei Mytnik
in album: The Art of Leonid Kogan: Chamber Music
  type: MusicAlbum
  date published: 2024-12-12
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f2a8019c9c8d6ec1f092caee6f751692e600c6681919e85a2f288fed5d12c3. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/FRZ111200530.
  date published: 2026-07-30T15:42:38Z
audio: Paganini: Cantabile for Violin and Piano in D Major, Op. 17
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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

Brahms: Violin Sonata No. 1 in G Major, Op. 78: I. Vivace ma non troppo
type: MusicRecording
duration: PT9M22S
duration ms: 562373
explicit: false
by artist: Johannes Brahms
by artist: Leonid Kogan
by artist: Andrei Mytnik
in album: The Art of Leonid Kogan: Chamber Music
  type: MusicAlbum
  date published: 2024-12-12
genre: classical
genre: german-romanticism
genre: late-romantic-era
subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x411ad443cce6a5c4ade994ff80e8d1e83cc2e8abf448103ae3c38320c0bee17e. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/GBAYC0502038.
  date published: 2026-07-30T19:42:40Z
audio: Brahms: Violin Sonata No. 1 in G Major, Op. 78: I. Vivace ma non troppo
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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

Brahms: Violin Sonata No. 1 in G Major, Op. 78: III. Allegro molto moderato
type: MusicRecording
duration: PT8M16S
duration ms: 496560
explicit: false
by artist: Johannes Brahms
by artist: Leonid Kogan
by artist: Andrei Mytnik
in album: The Art of Leonid Kogan: Chamber Music
  type: MusicAlbum
  date published: 2024-12-12
genre: classical
genre: german-romanticism
genre: late-romantic-era
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x968f44724453f6938a633fc502b90a9b344ea1c234df9c6be6b515846fbe6160. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBAYC0502040.
  date published: 2026-07-31T19:53:13Z
audio: Brahms: Violin Sonata No. 1 in G Major, Op. 78: III. Allegro molto moderato
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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

Leclair: Sonata for Two Violins in G Major, Op. 3 No. 1: II. Allegro ma poco
type: MusicRecording
duration: PT4M28S
duration ms: 268666
explicit: false
by artist: Jean-Marie Leclair
by artist: Leonid Kogan
by artist: Elizaveta Gilels
in album: The Art of Leonid Kogan: Chamber Music
  type: MusicAlbum
  date published: 2024-12-12
subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29f95f4e1c94748539cac0e301a09c0cb8bc3404ff61a1b29eaf19206cee004. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FRZ111400361.
  date published: 2026-07-31T15:20:15Z
audio: Leclair: Sonata for Two Violins in G Major, Op. 3 No. 1: II. Allegro ma poco
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additional property: CopyrightID
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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

Locatelli / Arr. Ysaÿe: Violin Sonata in F Minor, Op. 6 No. 7 "At the Tomb": I. Lento assai e mesto
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duration: PT3M59S
duration ms: 239666
explicit: false
by artist: Pietro Locatelli
by artist: Leonid Kogan
by artist: Andrei Mytnik
in album: The Art of Leonid Kogan: Chamber Music
  type: MusicAlbum
  date published: 2024-12-12
genre: baroque
genre: concerto
subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9961b0facf5bf90f3c892c838eadebf46d90b853f7bf1dc01c659d4066820b86. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ111400353.
  date published: 2026-07-31T17:29:52Z
audio: Locatelli / Arr. Ysaÿe: Violin Sonata in F Minor, Op. 6 No. 7 "At the Tomb": I. Lento assai e mesto
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  additional property: Speechiness
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  additional property: Acousticness
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  additional property: Valence (Positivity)
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additional property: CopyrightID
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additional property: OTSVerificationAPI
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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

Locatelli / Arr. Ysaÿe: Violin Sonata in F Minor, Op. 6 No. 7 "At the Tomb": II. Allegro
type: MusicRecording
duration: PT1M55S
duration ms: 115466
explicit: false
by artist: Pietro Locatelli
by artist: Leonid Kogan
by artist: Andrei Mytnik
in album: The Art of Leonid Kogan: Chamber Music
  type: MusicAlbum
  date published: 2024-12-12
genre: baroque
genre: concerto
subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67045bba37d3c3e99facce01df1f67f1c930f2f4b231c1ba84852fe2bbf55e64. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FRZ111400354.
  date published: 2026-07-31T19:53:13Z
audio: Locatelli / Arr. Ysaÿe: Violin Sonata in F Minor, Op. 6 No. 7 "At the Tomb": II. Allegro
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additional property: CopyrightID
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
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additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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

Locatelli / Arr. Ysaÿe: Violin Sonata in F Minor, Op. 6 No. 7 "At the Tomb": IV. Tempo moderato
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duration: PT4M7S
duration ms: 247306
explicit: false
by artist: Pietro Locatelli
by artist: Leonid Kogan
by artist: Andrei Mytnik
in album: The Art of Leonid Kogan: Chamber Music
  type: MusicAlbum
  date published: 2024-12-12
genre: baroque
genre: concerto
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa5e2ad3d3b518e3e7cfd5446daf2141e57b21cae7c1881fbb6bde9a2474320. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/FRZ111400356.
  date published: 2026-07-31T20:22:46Z
audio: Locatelli / Arr. Ysaÿe: Violin Sonata in F Minor, Op. 6 No. 7 "At the Tomb": IV. Tempo moderato
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  additional property: Mode (Major/Minor)
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  additional property: Speechiness
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  additional property: Loudness (dB)
    type: PropertyValue
    value: -14.838
  additional property: Key Name
    type: PropertyValue
    value: F
  additional property: Mode Name
    type: PropertyValue
    value: Minor
isrc code: FRZ111400356
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
  value: true
additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 960459
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-31T20:22:46+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ111400356
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960459
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960459
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T20:22:46+00:00
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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

Leclair: Sonata for Two Violins in C Major, Op. 3 No. 3: I. Adagio - Vivace
type: MusicRecording
duration: PT5M17S
duration ms: 317773
explicit: false
by artist: Jean-Marie Leclair
by artist: Leonid Kogan
by artist: Elizaveta Gilels
in album: The Art of Leonid Kogan: Chamber Music
  type: MusicAlbum
  date published: 2024-12-12
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccaa3a3da5fd55dad37af72edc0c30272a4475798ab0f903fb3127572f9ec9dc. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FRZ111400357.
  date published: 2026-07-31T15:20:15Z
audio: Leclair: Sonata for Two Violins in C Major, Op. 3 No. 3: I. Adagio - Vivace
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 133.093
  additional property: Musical Key
    type: PropertyValue
    value: 0
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.443
  additional property: Energy
    type: PropertyValue
    value: 0.192
  additional property: Speechiness
    type: PropertyValue
    value: 0.042
  additional property: Acousticness
    type: PropertyValue
    value: 0.987
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.068
  additional property: Liveness
    type: PropertyValue
    value: 0.124
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.665
  additional property: Loudness (dB)
    type: PropertyValue
    value: -18.691
  additional property: Key Name
    type: PropertyValue
    value: C
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: FRZ111400357
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
  value: true
additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 960418
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-31T15:20:15+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ111400357
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960418
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960418
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T15:20:15+00:00
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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

Leclair: Sonata for Two Violins in C Major, Op. 3 No. 3: II. Adagio
type: MusicRecording
duration: PT3M50S
duration ms: 230493
explicit: false
by artist: Jean-Marie Leclair
by artist: Leonid Kogan
by artist: Elizaveta Gilels
in album: The Art of Leonid Kogan: Chamber Music
  type: MusicAlbum
  date published: 2024-12-12
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cb77b247cb16693740c146db49682124a0a30417b78b1c06aedf18261a0aeb6. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/FRZ111400358.
  date published: 2026-07-30T12:45:34Z
audio: Leclair: Sonata for Two Violins in C Major, Op. 3 No. 3: II. Adagio
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 95.132
  additional property: Musical Key
    type: PropertyValue
    value: 9
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.119
  additional property: Energy
    type: PropertyValue
    value: 0.051
  additional property: Speechiness
    type: PropertyValue
    value: 0.055
  additional property: Acousticness
    type: PropertyValue
    value: 0.984
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.065
  additional property: Liveness
    type: PropertyValue
    value: 0.187
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.129
  additional property: Loudness (dB)
    type: PropertyValue
    value: -25.564
  additional property: Key Name
    type: PropertyValue
    value: A
  additional property: Mode Name
    type: PropertyValue
    value: Minor
isrc code: FRZ111400358
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
  value: true
additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 960258
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-30T12:45:34+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ111400358
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960258
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960258
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T12:45:34+00:00
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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

Ysaÿe: Sonata for Two Violins in A Minor: II. Allegretto poco lento
type: MusicRecording
duration: PT4M57S
duration ms: 297600
explicit: false
by artist: Eugène Ysaÿe
by artist: Leonid Kogan
by artist: Elizaveta Gilels
in album: The Art of Leonid Kogan: Chamber Music
  type: MusicAlbum
  date published: 2024-12-12
genre: late-romantic-era
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46bd980d1210952b0a307bc3cec6ae340002aca28865551a614d8ed5973eb1c6. 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/FRZ111400367.
  date published: 2026-07-31T18:48:12Z
audio: Ysaÿe: Sonata for Two Violins in A Minor: II. Allegretto poco lento
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 125.613
  additional property: Musical Key
    type: PropertyValue
    value: 7
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 0
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.258
  additional property: Energy
    type: PropertyValue
    value: 0.063
  additional property: Speechiness
    type: PropertyValue
    value: 0.044
  additional property: Acousticness
    type: PropertyValue
    value: 0.981
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.056
  additional property: Liveness
    type: PropertyValue
    value: 0.149
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.073
  additional property: Loudness (dB)
    type: PropertyValue
    value: -21.553
  additional property: Key Name
    type: PropertyValue
    value: G
  additional property: Mode Name
    type: PropertyValue
    value: Minor
isrc code: FRZ111400367
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
  value: true
additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 960448
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-31T18:48:12+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ111400367
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960448
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960448
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T18:48:12+00:00
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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

Ysaÿe: Sonata for Two Violins in A Minor: III. Allegro vivo e con fuoco - Moderato amabile
type: MusicRecording
duration: PT9M40S
duration ms: 580266
explicit: false
by artist: Eugène Ysaÿe
by artist: Leonid Kogan
by artist: Elizaveta Gilels
in album: The Art of Leonid Kogan: Chamber Music
  type: MusicAlbum
  date published: 2024-12-12
genre: late-romantic-era
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8207d231d96d95b89a5bbc57c69f5533ab5c228fb5ce79775a886be492ad950a. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FRZ111400368.
  date published: 2026-07-31T19:53:13Z
audio: Ysaÿe: Sonata for Two Violins in A Minor: III. Allegro vivo e con fuoco - Moderato amabile
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 132.679
  additional property: Musical Key
    type: PropertyValue
    value: 2
  additional property: Mode (Major/Minor)
    type: PropertyValue
    value: 1
  additional property: Time Signature
    type: PropertyValue
    value: 5
  additional property: Danceability
    type: PropertyValue
    value: 0.364
  additional property: Energy
    type: PropertyValue
    value: 0.091
  additional property: Speechiness
    type: PropertyValue
    value: 0.045
  additional property: Acousticness
    type: PropertyValue
    value: 0.974
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.284
  additional property: Liveness
    type: PropertyValue
    value: 0.088
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.256
  additional property: Loudness (dB)
    type: PropertyValue
    value: -21.047
  additional property: Key Name
    type: PropertyValue
    value: D
  additional property: Mode Name
    type: PropertyValue
    value: Major
isrc code: FRZ111400368
additional property: CopyrightID
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
  value: true
additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
  value: 960455
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-07-31T19:53:13+00:00
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ111400368
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 960455
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/960455
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-31T19:53:13+00:00
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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