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description: thumb|Jansen (2010) Maarten Evert Reinoud Gerard Nicolaas Jansen (born 4 October 1952 in Zeist) is a Dutch academic and professor of Mesoamerican archaeology and history. As of 2007 Jansen holds the p
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track: Violin Concerto No. 2 in E Major, BWV 1042: I. Allegro
track: Violin Concerto No. 2 in E Major, BWV 1042: II. Adagio
track: Violin Concerto No. 2 in E Major, BWV 1042: III. Allegro assai
track: Violin Concerto No. 1 in A Minor, BWV 1041: I. [Allegro moderato]
track: Violin Concerto No. 1 in A Minor, BWV 1041: II. Andante
track: Violin Concerto No. 1 in A Minor, BWV 1041: III. Allegro assai
track: Concerto for Violin and Oboe in C Minor, BWV 1060R: I. Allegro
track: Concerto for Violin and Oboe in C Minor, BWV 1060R: II. Adagio
track: Concerto for Violin and Oboe in C Minor, BWV 1060R: III. Allegro
track: Violin Concerto No. 1 in E Major, RV 269 "La primavera": I. Allegro
track: Violin Concerto No. 1 in E Major, RV 269 "La primavera": II. Largo
track: Violin Concerto No. 1 in E Major, RV 269 "La primavera": III. Allegro
track: Violin Concerto No. 2 in G Minor, RV 315 "L'estate": I. Allegro non molto
track: Violin Concerto No. 2 in G Minor, RV 315 "L'estate": II. Adagio - Presto
track: Violin Concerto No. 2 in G Minor, RV 315 "L'estate": III. Presto
track: Violin Concerto No. 3 in F Major, RV 293 "L'autunno": I. Allegro
track: Violin Concerto No. 3 in F Major, RV 293 "L'autunno": II. Adagio molto
track: Violin Concerto No. 3 in F Major, RV 293 "L'autunno": III. Allegro
track: Violin Concerto No. 4 in F Minor, RV 297 "L'inverno": I. Allegro non molto

Violin Concerto No. 2 in E Major, BWV 1042: I. Allegro
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audio: Violin Concerto No. 2 in E Major, BWV 1042: I. Allegro
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Violin Concerto No. 2 in E Major, BWV 1042: II. Adagio
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audio: Violin Concerto No. 2 in E Major, BWV 1042: II. Adagio
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Violin Concerto No. 2 in E Major, BWV 1042: III. Allegro assai
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Violin Concerto No. 1 in A Minor, BWV 1041: I. [Allegro moderato]
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Violin Concerto No. 1 in A Minor, BWV 1041: II. Andante
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Violin Concerto No. 1 in A Minor, BWV 1041: III. Allegro assai
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Concerto for Violin and Oboe in C Minor, BWV 1060R: I. Allegro
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Concerto for Violin and Oboe in C Minor, BWV 1060R: II. Adagio
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Concerto for Violin and Oboe in C Minor, BWV 1060R: III. Allegro
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Violin Concerto No. 1 in E Major, RV 269 "La primavera": I. Allegro
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Violin Concerto No. 1 in E Major, RV 269 "La primavera": II. Largo
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-06-13T12:47:07Z
audio: Violin Concerto No. 1 in E Major, RV 269 "La primavera": II. Largo
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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Violin Concerto No. 1 in E Major, RV 269 "La primavera": III. Allegro
type: MusicRecording
duration: PT3M55S
duration ms: 235000
explicit: false
by artist: Antonio Vivaldi
by artist: Janine Jansen
by artist: Candida Thompson
by artist: Henk Rubingh
by artist: Julian Rachlin
by artist: Maarten Jansen
by artist: Stacey Watton
by artist: Liz Kenny
by artist: Jan Jansen
in album: Vivaldi: The Four Seasons
  type: MusicAlbum
  date published: 2004-08-01
isrc code: GBBBA0441730
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
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additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-13T12:47:07Z
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
additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: BitcoinTime
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-06-13T12:47:07Z
audio: Violin Concerto No. 1 in E Major, RV 269 "La primavera": III. Allegro
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Violin Concerto No. 2 in G Minor, RV 315 "L'estate": I. Allegro non molto
type: MusicRecording
duration: PT5M15S
duration ms: 315413
explicit: false
by artist: Antonio Vivaldi
by artist: Janine Jansen
by artist: Candida Thompson
by artist: Henk Rubingh
by artist: Julian Rachlin
by artist: Maarten Jansen
by artist: Stacey Watton
by artist: Liz Kenny
by artist: Jan Jansen
in album: Vivaldi: The Four Seasons
  type: MusicAlbum
  date published: 2004-08-01
isrc code: GBBBA0441740
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0441740
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-13T12:53:06Z
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
additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: ContentHash
additional property: BitcoinBlock
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additional property: BitcoinTime
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-06-13T12:53:06Z
audio: Violin Concerto No. 2 in G Minor, RV 315 "L'estate": I. Allegro non molto
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  additional property: Danceability
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  additional property: Energy
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  additional property: Speechiness
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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  additional property: Key Name
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  additional property: Mode Name
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Violin Concerto No. 2 in G Minor, RV 315 "L'estate": II. Adagio - Presto
type: MusicRecording
duration: PT2M12S
duration ms: 132173
explicit: false
by artist: Antonio Vivaldi
by artist: Janine Jansen
by artist: Candida Thompson
by artist: Henk Rubingh
by artist: Julian Rachlin
by artist: Maarten Jansen
by artist: Stacey Watton
by artist: Liz Kenny
by artist: Jan Jansen
in album: Vivaldi: The Four Seasons
  type: MusicAlbum
  date published: 2004-08-01
isrc code: GBBBA0441750
additional property: CopyrightID
additional property: CopyrightStatus
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additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
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  value: https://blockstream.info/api/block-height/953520
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0441750
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-13T13:32:09+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
additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: ContentHash
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additional property: BitcoinTime
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subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10dc3d25624af1d467b4d1ba4ffff333bb607f522b5a4d9f893c34a9d6304c28. 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/GBBBA0441750.
  date published: 2026-06-13T17:25:41Z
audio: Violin Concerto No. 2 in G Minor, RV 315 "L'estate": II. Adagio - Presto
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Violin Concerto No. 2 in G Minor, RV 315 "L'estate": III. Presto
type: MusicRecording
duration: PT2M42S
duration ms: 162040
explicit: false
by artist: Antonio Vivaldi
by artist: Janine Jansen
by artist: Candida Thompson
by artist: Henk Rubingh
by artist: Julian Rachlin
by artist: Maarten Jansen
by artist: Stacey Watton
by artist: Liz Kenny
by artist: Jan Jansen
in album: Vivaldi: The Four Seasons
  type: MusicAlbum
  date published: 2004-08-01
isrc code: GBBBA0441760
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
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additional property: CopyrightChainExplorerURL
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additional property: OTSHash
additional property: OTSBitcoinBlock
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additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953513
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0441760
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-13T12:47:07Z
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
additional property: ProofProfileEvidenceStatus
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additional property: TokenDeploymentConfirmed
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additional property: ContentHash
additional property: BitcoinBlock
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additional property: BitcoinTime
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subject of: OpenTimestamps Proof of Existence
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  date published: 2026-06-13T12:47:07Z
audio: Violin Concerto No. 2 in G Minor, RV 315 "L'estate": III. Presto
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  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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  additional property: Time Signature
    type: PropertyValue
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  additional property: Danceability
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  additional property: Energy
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  additional property: Liveness
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  additional property: Valence (Positivity)
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  additional property: Loudness (dB)
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  additional property: Key Name
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Violin Concerto No. 3 in F Major, RV 293 "L'autunno": I. Allegro
type: MusicRecording
duration: PT5M1S
duration ms: 301720
explicit: false
by artist: Antonio Vivaldi
by artist: Janine Jansen
by artist: Candida Thompson
by artist: Henk Rubingh
by artist: Julian Rachlin
by artist: Maarten Jansen
by artist: Stacey Watton
by artist: Liz Kenny
by artist: Jan Jansen
in album: Vivaldi: The Four Seasons
  type: MusicAlbum
  date published: 2004-08-01
isrc code: GBBBA0441770
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-06-04T10:18:51+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x93113edf3f21fa61ff9f5a0e9d7179d05b85c444a0cbe47d67cf0a539e93763a
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953513
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953513
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0441770
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-13T12:47:07+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
additional property: ProofProfileEvidenceStatus
  type: PropertyValue
  value: verified-cc-db-prod
additional property: TokenDeploymentConfirmed
  type: PropertyValue
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additional property: ContentHash
additional property: BitcoinBlock
  type: PropertyValue
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additional property: BitcoinTime
  type: PropertyValue
  value: 2026-06-13T12:47:07+00:00
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93113edf3f21fa61ff9f5a0e9d7179d05b85c444a0cbe47d67cf0a539e93763a. 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/GBBBA0441770.
  date published: 2026-06-13T15:41:10Z
audio: Violin Concerto No. 3 in F Major, RV 293 "L'autunno": I. Allegro
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  additional property: Musical Key
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  additional property: Mode (Major/Minor)
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  additional property: Time Signature
    type: PropertyValue
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  additional property: Danceability
    type: PropertyValue
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  additional property: Energy
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  additional property: Speechiness
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  additional property: Acousticness
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  additional property: Instrumentalness
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  additional property: Liveness
    type: PropertyValue
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  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.222
  additional property: Loudness (dB)
    type: PropertyValue
    value: -17.165
  additional property: Key Name
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  additional property: Mode Name
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Violin Concerto No. 3 in F Major, RV 293 "L'autunno": II. Adagio molto
type: MusicRecording
duration: PT2M44S
duration ms: 164506
explicit: false
by artist: Antonio Vivaldi
by artist: Janine Jansen
by artist: Candida Thompson
by artist: Henk Rubingh
by artist: Julian Rachlin
by artist: Maarten Jansen
by artist: Stacey Watton
by artist: Liz Kenny
by artist: Jan Jansen
in album: Vivaldi: The Four Seasons
  type: MusicAlbum
  date published: 2004-08-01
isrc code: GBBBA0441780
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
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additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x48720c5844c06428991d7d313942fe44e9340e6b24aa13149ad41f331354925d
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 953528
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/953528
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBBBA0441780
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-13T15:41:10Z
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
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: 953528
additional property: BitcoinTime
  type: PropertyValue
  value: 2026-06-13T15:41:10+00:00
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
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Violin Concerto No. 4 in F Minor, RV 297 "L'inverno": I. Allegro non molto
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  date published: 2026-06-13T15:41:10Z
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