Carolus Hacquart
type: MusicGroup
description: Carolus Hacquart (the latinised form of his original name: Carel Hacquart) (c. 1640 - after 1686) was a Flemish composer and musician. He became one of the most important 17th-century composers in the
popularity: 8
followers: 143
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additional property: CopyrightChainExplorerURL
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additional property: OTSProofURL
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additional property: OTSVerificationAPI
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additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 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
subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f97f7c9a95ea86e7b0011ed0f78f94f0efd30c566ffd9aae4ce6a8039582571. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/522f20e5-e5a4-4fcc-83dc-2c54c7d8ed67.json and https://artists.proofprofile.net/proofs/artist/522f20e5-e5a4-4fcc-83dc-2c54c7d8ed67.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
  date published: 2026-06-17T08:10:43Z
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album: Carolus Hacquart: Le maistre de musique
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  date published: 2006-02-20
track: Sonata à 3 in D Minor, Op. 2 No. 6: I. Allegro
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  by artist: Carolus Hacquart
  by artist: London Baroque
  in album: Chamber Music: London Baroque - Rosenmuller, J. / Hacquart, C. / Buxtehude, D. / Biber, H. I. F. (The Trio Sonata in 17Th Century Germany)
    type: MusicAlbum
    date published: 2008-03-01
  popularity: 3
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  additional property: OTSVerificationAPI
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    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEP0845140
  additional property: OTSTimestamp
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    value: 2026-07-30T09:37:10Z
  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 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
  subject of: OpenTimestamps Proof of Existence
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    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf4bc515e35391f0ffb3bc2336b5e5ea38233ac023a46d1c941cf48b9b7eae6a. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEP0845140 — a six-check JSON result.
    date published: 2026-07-30T09:37:10Z
  audio: Sonata à 3 in D Minor, Op. 2 No. 6: I. Allegro
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track: Sonata à 3 in D Minor, Op. 2 No. 6: III. Adagio
  type: MusicRecording
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  by artist: Carolus Hacquart
  by artist: London Baroque
  in album: Chamber Music: London Baroque - Rosenmuller, J. / Hacquart, C. / Buxtehude, D. / Biber, H. I. F. (The Trio Sonata in 17Th Century Germany)
    type: MusicAlbum
    date published: 2008-03-01
  popularity: 3
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  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-08T03:20:19Z
  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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f25960588ee6caccd2f81635699e17f499517efd3e6c6a741f2d628930e4d0. 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/SEAEP0845160 — a six-check JSON result.
    date published: 2026-07-08T03:20:19Z
  audio: Sonata à 3 in D Minor, Op. 2 No. 6: III. Adagio
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track: Sonata à 3 in D Minor, Op. 2 No. 6: VI. Canzona. Vivace - Adagio
track: Sonata à 3 in D Minor, Op. 2 No. 6: II. Adagio
track: Sonata à 3 in D Minor, Op. 2 No. 6: IV. Adagio
track: Sonata à 3 in D Minor, Op. 2 No. 6: V. Grave - Allegro
track: Sonata à 3 in D Minor, Op. 2 No. 6: VII. Aria. Vivace

Valence (Positivity)
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value: 0.144

Loudness (dB)
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value: -21.343

Key Name
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value: C#

Mode Name
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value: Minor

Sonata à 3 in D Minor, Op. 2 No. 6: VI. Canzona. Vivace - Adagio
type: MusicRecording
duration: PT2M17S
duration ms: 137840
explicit: false
by artist: Carolus Hacquart
by artist: London Baroque
in album: Chamber Music: London Baroque - Rosenmuller, J. / Hacquart, C. / Buxtehude, D. / Biber, H. I. F. (The Trio Sonata in 17Th Century Germany)
  type: MusicAlbum
  date published: 2008-03-01
popularity: 3
isrc code: SEAEP0845190
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: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEP0845190
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T07:28:30Z
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ea514e2abfb80488b96d376442153119aee7314515a8fda34d256dc9baaf31. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEP0845190 — a six-check JSON result.
  date published: 2026-07-30T07:28:30Z
audio: Sonata à 3 in D Minor, Op. 2 No. 6: VI. Canzona. Vivace - Adagio
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  additional property: Danceability
    type: PropertyValue
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  additional property: Speechiness
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    type: PropertyValue
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  additional property: Valence (Positivity)
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Sonata à 3 in D Minor, Op. 2 No. 6: II. Adagio
type: MusicRecording
duration: PT1M42S
duration ms: 102493
explicit: false
by artist: Carolus Hacquart
by artist: London Baroque
in album: Chamber Music: London Baroque - Rosenmuller, J. / Hacquart, C. / Buxtehude, D. / Biber, H. I. F. (The Trio Sonata in 17Th Century Germany)
  type: MusicAlbum
  date published: 2008-03-01
popularity: 2
isrc code: SEAEP0845150
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-30T21:25:46+00:00
additional property: CopyrightChainExplorerURL
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  value: https://explorer.copyrightchains.com/tx/0xd9ba5be2acf383c85a83285bbaa2f9d16f7b3e5e7c39f86bcc86f6ff1c258c67
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/SEAEP0845150
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-30T22:27:30Z
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ba5be2acf383c85a83285bbaa2f9d16f7b3e5e7c39f86bcc86f6ff1c258c67. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEP0845150 — a six-check JSON result.
  date published: 2026-07-30T22:27:30Z
audio: Sonata à 3 in D Minor, Op. 2 No. 6: II. Adagio
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Sonata à 3 in D Minor, Op. 2 No. 6: IV. Adagio
type: MusicRecording
duration: PT1M53S
duration ms: 113386
explicit: false
by artist: Carolus Hacquart
by artist: London Baroque
in album: Chamber Music: London Baroque - Rosenmuller, J. / Hacquart, C. / Buxtehude, D. / Biber, H. I. F. (The Trio Sonata in 17Th Century Germany)
  type: MusicAlbum
  date published: 2008-03-01
popularity: 2
isrc code: SEAEP0845170
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-07T01:02:09+00:00
additional property: CopyrightChainExplorerURL
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  value: https://explorer.copyrightchains.com/tx/0x391ecce79e6b7ac327aac540e14c417d7198c81d497caf98e8c55d2871fff9e6
additional property: OTSHash
additional property: OTSBitcoinBlock
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  value: 957118
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/957118
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEP0845170
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-07-08T03:20:19Z
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
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x391ecce79e6b7ac327aac540e14c417d7198c81d497caf98e8c55d2871fff9e6. 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/SEAEP0845170 — a six-check JSON result.
  date published: 2026-07-08T03:20:19Z
audio: Sonata à 3 in D Minor, Op. 2 No. 6: IV. Adagio
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Sonata à 3 in D Minor, Op. 2 No. 6: V. Grave - Allegro
type: MusicRecording
duration: PT0M43S
duration ms: 43360
explicit: false
by artist: Carolus Hacquart
by artist: London Baroque
in album: Chamber Music: London Baroque - Rosenmuller, J. / Hacquart, C. / Buxtehude, D. / Biber, H. I. F. (The Trio Sonata in 17Th Century Germany)
  type: MusicAlbum
  date published: 2008-03-01
popularity: 2
isrc code: SEAEP0845180
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
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additional property: OTSVerificationAPI
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audio: Sonata à 3 in D Minor, Op. 2 No. 6: V. Grave - Allegro
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Sonata à 3 in D Minor, Op. 2 No. 6: VII. Aria. Vivace
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by artist: Carolus Hacquart
by artist: London Baroque
in album: Chamber Music: London Baroque - Rosenmuller, J. / Hacquart, C. / Buxtehude, D. / Biber, H. I. F. (The Trio Sonata in 17Th Century Germany)
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subject of: OpenTimestamps Proof of Existence
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