Jeff Rolka
type: MusicGroup
popularity: 7
followers: 999
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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 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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  date published: 2026-06-21T07:29:20Z
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album: These Days
  type: MusicAlbum
  date published: 1967
album: Dear Prudence / Eclipse
  type: MusicAlbum
  date published: 1968
album: Somewhere in the Fade
  type: MusicAlbum
  date published: 2006-01-01
album: I'm Only Sleeping
  type: MusicAlbum
  date published: 2007-12-30
album: The Atlanticean
  type: MusicAlbum
  date published: 2012-06-30
album: Jeff Rolka Live At the Berkeley Piano Club
  type: MusicAlbum
  date published: 2012-10-01
album: Jeff Rolka Live At the Berkeley Piano Club
  type: MusicAlbum
  date published: 2012-10-01
album: The First Noel
  type: MusicAlbum
  date published: 2013-09-27
album: Voice Lessons: Warm Up! with Jeff Rolka
  type: MusicAlbum
  date published: 2013-10-23
  track: Warm Up -: Tenor
    type: MusicRecording
    duration: PT19M53S
    duration ms: 1193082
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    by artist: Jeff Rolka
    in album: Voice Lessons: Warm Up! with Jeff Rolka
      type: MusicAlbum
      date published: 2013-10-23
    isrc code: QMFMG1375218
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    additional property: OTSTimestamp
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      value: 2026-07-21T22:32:59Z
    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 0x9335a3223ec587d89805bdaa1acd15b17ffd2e9f18a8556e86409245ff759fa0. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QMFMG1375218 — a six-check JSON result.
      date published: 2026-07-21T22:32:59Z
    audio: Warm Up -: Tenor
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      additional property: Tempo (BPM)
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        value: 135.716
      additional property: Musical Key
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        value: 11
      additional property: Mode (Major/Minor)
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        value: 4
      additional property: Danceability
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      additional property: Valence (Positivity)
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        value: 0.497
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        value: -19.788
      additional property: Key Name
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        value: B
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        value: Major
  track: Warm Up -: Baritone
    type: MusicRecording
    duration: PT15M16S
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    by artist: Jeff Rolka
    in album: Voice Lessons: Warm Up! with Jeff Rolka
      type: MusicAlbum
      date published: 2013-10-23
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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
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc97f91ada6df185f83d6c0bd937f0e9461ab78014ef755421fb3f308f9f34f29. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QMFMG1375219 — a six-check JSON result.
      date published: 2026-07-21T23:25:37Z
    audio: Warm Up -: Baritone
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      additional property: Tempo (BPM)
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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
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      additional property: Danceability
      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: Voice Lessons: Resonance with Jeff Rolka
album: Iowa (Ensemble Version)
album: Funeral
album: If You Want Me To
album: Iowa
album: Gentle Warm up - September 2020
album: Baritenor Full Range Singing Warm Up
album: Good Enough

Danceability
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value: 0.692

Energy
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value: 0.055

Speechiness
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value: 0.467

Acousticness
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value: 0.85

Instrumentalness
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value: 0

Liveness
type: PropertyValue
value: 0.154

Valence (Positivity)
type: PropertyValue
value: 0.337

Loudness (dB)
type: PropertyValue
value: -20.305

Key Name
type: PropertyValue
value: D

Mode Name
type: PropertyValue
value: Major

Voice Lessons: Resonance with Jeff Rolka
type: MusicAlbum
date published: 2013-11-22

Iowa (Ensemble Version)
type: MusicAlbum
date published: 2014

Funeral
type: MusicAlbum
date published: 2017

If You Want Me To
type: MusicAlbum
date published: 2018-06-20

Iowa
type: MusicAlbum
date published: 2018-07-31

Gentle Warm up - September 2020
type: MusicAlbum
date published: 2020-09-26

Baritenor Full Range Singing Warm Up
type: MusicAlbum
date published: 2022-01-29

Good Enough
type: MusicAlbum
date published: 2025-10-01