Mr. Jeff
type: MusicGroup
description: Jeffery Christopher Klemm (born May 23, 1987), known professionally as Mr. Jeff and Jeff Klemm, is an American singer, songwriter, record producer, and content creator. He makes children's music, and
popularity: 9
followers: 175
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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 0x4901678a21058590d79e492fe1c28932fa0701baab5b4d7783b43ea3c81e23a7. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d95d049d-3392-40f0-8b39-75a4ac02e326.json and https://artists.proofprofile.net/proofs/artist/d95d049d-3392-40f0-8b39-75a4ac02e326.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-21T04:51:12Z
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album: Loud In the Library
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  date published: 2024-01-12
album: Wonderful Wonderful Wonderful!!!
  type: MusicAlbum
  date published: 2024-02-23
album: Playin' On the Playground
  type: MusicAlbum
  date published: 2024-03-15
album: Wonderful Wonderful Wonderful
  type: MusicAlbum
  date published: 2024-03-22
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    by artist: Mr. Jeff
    in album: Wonderful Wonderful Wonderful
      type: MusicAlbum
      date published: 2024-03-22
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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
    subject of: OpenTimestamps Proof of Existence
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      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6932a284a91ba60d73226d16f8483fd5dcf18171544ec6397fb9e82d70cb89. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T08:44:16Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QMAAK2357818.
      date published: 2026-07-22T08:44:16Z
    audio: Wonderful Wonderful Wonderful!!!
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      additional property: Tempo (BPM)
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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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  track: Drivin' In My Racecar
    type: MusicRecording
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    by artist: Mr. Jeff
    in album: Wonderful Wonderful Wonderful
      type: MusicAlbum
      date published: 2024-03-22
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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
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      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f22cda9b5e5bd16568a984d6c5bce24e4022e8b53a7d6d40fb257c737f56f21. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:09:03Z), 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/QMAAK2357822.
      date published: 2026-07-20T21:09:03Z
    audio: Drivin' In My Racecar
      type: AudioObject
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        type: PropertyValue
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        type: PropertyValue
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      additional property: Mode (Major/Minor)
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      additional property: Time Signature
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      additional property: Danceability
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      additional property: Speechiness
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      additional property: Instrumentalness
      additional property: Liveness
      additional property: Valence (Positivity)
      additional property: Loudness (dB)
      additional property: Key Name
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album: Poppin' Bubbles
album: Sleepover
album: Slumberful Slumberful Slumberful (Dreamy Piano Version)
album: Wonderful Christmastime
album: Dancing Like An Animal
album: Picasso
album: GirlDad
album: Big Kid Stuff

Instrumentalness
type: PropertyValue
value: 0

Liveness
type: PropertyValue
value: 0.101

Valence (Positivity)
type: PropertyValue
value: 0.633

Loudness (dB)
type: PropertyValue
value: -7.451

Key Name
type: PropertyValue
value: A

Mode Name
type: PropertyValue
value: Major

Poppin' Bubbles
type: MusicAlbum
date published: 2024-04-26

Sleepover
type: MusicAlbum
date published: 2024-07-12

Slumberful Slumberful Slumberful (Dreamy Piano Version)
type: MusicAlbum
date published: 2024-10-04

Wonderful Christmastime
type: MusicAlbum
date published: 2024-11-29

Dancing Like An Animal
type: MusicAlbum
date published: 2025-03-21

Picasso
type: MusicAlbum
date published: 2025-06-06

GirlDad
type: MusicAlbum
date published: 2025-07-25

Big Kid Stuff
type: MusicAlbum
date published: 2025-08-22