Matt Kaff
type: MusicGroup
genre: lo-fi
genre: lo-fi beats
popularity: 20
followers: 222
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additional property: CopyrightChainExplorerURL
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additional property: OTSVerifyInstructions
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  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
subject of: OpenTimestamps Proof of Existence
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  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6acfa9b1f051d6376dad88a574cdb8017c5b6c61d87075ae9c1daf675a75f3ea. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/430470a8-de66-4a97-baf3-b1646463b54b.json and https://artists.proofprofile.net/proofs/artist/430470a8-de66-4a97-baf3-b1646463b54b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-14T15:20:52Z
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album: Feel Jolly
  type: MusicAlbum
  date published: 2021-09-24
  track: Feel Jolly
    type: MusicRecording
    duration: PT2M52S
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    by artist: Matt Kaff
    in album: Feel Jolly
      type: MusicAlbum
      date published: 2021-09-24
    genre: lo-fi
    genre: lo-fi beats
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    additional property: CopyrightID
    additional property: CopyrightStatus
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    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-05T04:47:21Z
    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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
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      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67baa97ca6a71f7db33f2bbe2b3d6075992457174558bd249e1c9d71547bbb55. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US66W2101328.
      date published: 2026-07-05T04:47:21Z
    audio: Feel Jolly
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 70.005
      additional property: Musical Key
        type: PropertyValue
        value: 10
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        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.638
      additional property: Energy
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      additional property: Speechiness
        type: PropertyValue
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      additional property: Acousticness
        type: PropertyValue
        value: 0.496
      additional property: Instrumentalness
        type: PropertyValue
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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: -13.141
      additional property: Key Name
        type: PropertyValue
        value: Bb
      additional property: Mode Name
        type: PropertyValue
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album: On Repeat
  type: MusicAlbum
  date published: 2021-10-08
album: Livin' Is Strong
  type: MusicAlbum
  date published: 2022-06-10
album: Care For Lads
  type: MusicAlbum
  date published: 2022-06-24
  track: Care For Lads
    type: MusicRecording
    duration: PT2M51S
    duration ms: 171664
    explicit: false
    by artist: Matt Kaff
    in album: Care For Lads
      type: MusicAlbum
      date published: 2022-06-24
    genre: lo-fi
    genre: lo-fi beats
    isrc code: US66W2200626
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    additional property: CopyrightStatus
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    additional property: OTSVerificationAPI
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    additional property: OTSTimestamp
      type: PropertyValue
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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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f164743fc7d5b83098be0926b1ab4d49047a32c81ef2d6c806d49f7fe129f49. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/US66W2200626.
      date published: 2026-07-03T19:59:51Z
    audio: Care For Lads
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 69.993
      additional property: Musical Key
        type: PropertyValue
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      additional property: Mode (Major/Minor)
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        type: PropertyValue
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      additional property: Danceability
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      additional property: Energy
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      additional property: Acousticness
      additional property: Instrumentalness
      additional property: Liveness
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
      additional property: Mode Name
album: Grain of Pepper
album: PIMO
album: Around The World
album: Rising From The Ground
album: Strike A Pose
album: True or False
album: This Nonesense
album: Just the Rhythm
album: Slow and Free

Acousticness
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value: 0.974

Instrumentalness
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Liveness
type: PropertyValue
value: 0.127

Valence (Positivity)
type: PropertyValue
value: 0.138

Loudness (dB)
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value: -20.866

Key Name
type: PropertyValue
value: C

Mode Name
type: PropertyValue
value: Major

Grain of Pepper
type: MusicAlbum
date published: 2022-08-05
track: Grain of Pepper
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  duration: PT2M52S
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  by artist: Matt Kaff
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    type: MusicAlbum
    date published: 2022-08-05
  genre: lo-fi
  genre: lo-fi beats
  isrc code: US66W2201002
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  additional property: OTSHash
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  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US66W2201002
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-19T12:24:55Z
  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
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17418db6b105e10b79a3d82a74f6fcc732ec9e7977c389c97c74dc3b3877cbf. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/US66W2201002.
    date published: 2026-07-19T12:24:55Z
  audio: Grain of Pepper
    type: AudioObject
    additional property: Tempo (BPM)
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    additional property: Musical Key
      type: PropertyValue
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    additional property: Mode (Major/Minor)
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    additional property: Time Signature
      type: PropertyValue
      value: 4
    additional property: Danceability
      type: PropertyValue
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    additional property: Energy
      type: PropertyValue
      value: 0.057
    additional property: Speechiness
      type: PropertyValue
      value: 0.041
    additional property: Acousticness
      type: PropertyValue
      value: 0.95
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.963
    additional property: Liveness
      type: PropertyValue
      value: 0.109
    additional property: Valence (Positivity)
      type: PropertyValue
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    additional property: Loudness (dB)
      type: PropertyValue
      value: -21.209
    additional property: Key Name
      type: PropertyValue
      value: C
    additional property: Mode Name
      type: PropertyValue
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PIMO
type: MusicAlbum
date published: 2022-08-26

Around The World
type: MusicAlbum
date published: 2022-12-09

Rising From The Ground
type: MusicAlbum
date published: 2023-04-21

Strike A Pose
type: MusicAlbum
date published: 2023-05-05

True or False
type: MusicAlbum
date published: 2024-08-16

This Nonesense
type: MusicAlbum
date published: 2024-08-30

Just the Rhythm
type: MusicAlbum
date published: 2025-03-21

Slow and Free
type: MusicAlbum
date published: 2025-03-28