Gudrun Schröfel
type: MusicGroup
genre: choral
description: Gudrun Schröfel (born 1 February 1943) is a German choral conductor, conductor and academic teacher. She led choirs, namely the Mädchenchor Hannover, to competition successes and awards for recordings
popularity: 7
followers: 79
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x7c00e45f6c73627d501b54ad52664801e365943c53e5d23ca408871c909d2646
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954066
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954066
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/59b9e775-c086-42f0-8874-47fe9651578d.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/59b9e775-c086-42f0-8874-47fe9651578d.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/59b9e775-c086-42f0-8874-47fe9651578d
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-17T08:11:48Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0x7c00e45f6c73627d501b54ad52664801e365943c53e5d23ca408871c909d2646","name":"Gudrun Schröfel","registered_at":"2026-06-16T20:54:12Z","symbol":"NIM1172743","token_address":"0xbe5fc6d5f211951c4e20a4cc65a8d13ce80f6f0b","type":"artist","uuid":"59b9e775-c086-42f0-8874-47fe9651578d"}
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
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c00e45f6c73627d501b54ad52664801e365943c53e5d23ca408871c909d2646. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/59b9e775-c086-42f0-8874-47fe9651578d.json and https://artists.proofprofile.net/proofs/artist/59b9e775-c086-42f0-8874-47fe9651578d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T08:11:48Z
  text: {"copyright_id":"0x7c00e45f6c73627d501b54ad52664801e365943c53e5d23ca408871c909d2646","name":"Gudrun Schröfel","registered_at":"2026-06-16T20:54:12Z","symbol":"NIM1172743","token_address":"0xbe5fc6d5f211951c4e20a4cc65a8d13ce80f6f0b","type":"artist","uuid":"59b9e775-c086-42f0-8874-47fe9651578d"}
album: Andreas Tarkmann: Inka-Kantate Töchter der Sonne & Gustav Holst: Savitri
  type: MusicAlbum
  date published: 2019-03-01
album: Sacred Vocal Music from Wolfenbüttel (Verklingend und ewig)
  type: MusicAlbum
  date published: 2011-06-24
  track: Il secondo Libro de Madrigali a quattro voci (Das zweite Madrigalbuch): No. 5 o notte, o ciel', o mar', o piaggie, o monti!
    type: MusicRecording
    duration: PT1M26S
    duration ms: 86000
    explicit: false
    by artist: Maddalena Casulana
    by artist: Mädchenchor Hannover
    by artist: Gudrun Schröfel
    in album: Sacred Vocal Music from Wolfenbüttel (Verklingend und ewig)
      type: MusicAlbum
      date published: 2011-06-24
    popularity: 1
    genre: italian-renaissance
    isrc code: DEN421111005
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-30T15:07:06+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x0d9effe221932c9361fc92603a9bc6a0d3276ed110ff47d1cda09ac9b3b27a98
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 960273
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/960273
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN421111005
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-30T15:42:38Z
    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 0x0d9effe221932c9361fc92603a9bc6a0d3276ed110ff47d1cda09ac9b3b27a98. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/DEN421111005.
      date published: 2026-07-30T15:42:38Z
    audio: Il secondo Libro de Madrigali a quattro voci (Das zweite Madrigalbuch): No. 5 o notte, o ciel', o mar', o piaggie, o monti!
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 97.535
      additional property: Musical Key
        type: PropertyValue
        value: 9
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.274
      additional property: Energy
        type: PropertyValue
        value: 0.061
      additional property: Speechiness
        type: PropertyValue
        value: 0.039
      additional property: Acousticness
        type: PropertyValue
        value: 0.994
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.911
      additional property: Liveness
        type: PropertyValue
        value: 0.108
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.232
      additional property: Loudness (dB)
        type: PropertyValue
        value: -22.924
      additional property: Key Name
        type: PropertyValue
        value: A
      additional property: Mode Name
        type: PropertyValue
        value: Minor
album: Maria Xaveria Perucona & Chiara Margarita Cozzolani: Psalmen und Motetten aus italienischen Konventen (Gaude, Plaude!)
  type: MusicAlbum
  date published: 2008-09-12
album: Benjamin Britten: Children's Crusade / A Ceremony of Carols
  type: MusicAlbum
  date published: 2015-10-30
  track: A Ceremony of Carols, Op. 28 No. 1-12: No. 5 Balulalow
    type: MusicRecording
    duration: PT1M15S
    duration ms: 75120
    explicit: false
    by artist: Benjamin Britten
    by artist: Katharina Held
    by artist: Mädchenchor Hannover
    by artist: Birgit Bachhuber
    by artist: Gudrun Schröfel
    in album: Benjamin Britten: Children's Crusade / A Ceremony of Carols
      type: MusicAlbum
      date published: 2015-10-30
    popularity: 5
    isrc code: DEN421504005
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-31T16:39:02+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xf46d28668fa621821c30f727e4652e4443bd38a83676607adecbc1243c829291
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 960441
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/960441
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN421504005
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-31T17:29:52Z
    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 0xf46d28668fa621821c30f727e4652e4443bd38a83676607adecbc1243c829291. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEN421504005.
      date published: 2026-07-31T17:29:52Z
    audio: A Ceremony of Carols, Op. 28 No. 1-12: No. 5 Balulalow
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 109.276
      additional property: Musical Key
        type: PropertyValue
        value: 6
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.222
      additional property: Energy
      additional property: Speechiness
      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: Messen für Frauenchor
album: Andreas N. Tarkmann: Didos Geheimnis (Dido's secret)
album: André Caplet: Le Miroir de Jésus
album: Glaubenslieder: Neue Kantaten zum Kirchenjahr
album: Kaleidoskop
album: Jakobs Stern ist aufgegangen. Weihnachtliche Chormusik
album: Weihnachtliche Chormusik der Romantik (Arr. von Andreas N. Tarkmann)
album: Weihnachten - Stille, stille, lasst uns lauschen

Energy
type: PropertyValue
value: 0.029

Speechiness
type: PropertyValue
value: 0.055

Acousticness
type: PropertyValue
value: 0.979

Instrumentalness
type: PropertyValue
value: 0.005

Liveness
type: PropertyValue
value: 0.094

Valence (Positivity)
type: PropertyValue
value: 0.037

Loudness (dB)
type: PropertyValue
value: -30.507

Key Name
type: PropertyValue
value: F#

Mode Name
type: PropertyValue
value: Minor

Messen für Frauenchor
type: MusicAlbum
date published: 2013-12-01

Andreas N. Tarkmann: Didos Geheimnis (Dido's secret)
type: MusicAlbum
date published: 2013-06-10

André Caplet: Le Miroir de Jésus
type: MusicAlbum
date published: 2012-02-20

Glaubenslieder: Neue Kantaten zum Kirchenjahr
type: MusicAlbum
date published: 2009-12-01

Kaleidoskop
type: MusicAlbum
date published: 1993-01-01
track: Choral Hymns From The Rig Vega: III. Hymn To Vena
  type: MusicRecording
  duration: PT5M2S
  duration ms: 302293
  explicit: false
  by artist: Gustav Holst
  by artist: Mädchenchor Hannover
  by artist: Ludwig Rutt
  by artist: Gudrun Schröfel
  in album: Kaleidoskop
    type: MusicAlbum
    date published: 1993-01-01
  genre: classical
  genre: orchestra
  isrc code: DEC299217410
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-07T16:18:14+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x6790235233d54c05fd94696bab170515aabc8ea9003929e40108b426dd130e69
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 957124
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/957124
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEC299217410
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-08T03:53:27Z
  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 0x6790235233d54c05fd94696bab170515aabc8ea9003929e40108b426dd130e69. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEC299217410.
    date published: 2026-07-08T03:53:27Z
  audio: Choral Hymns From The Rig Vega: III. Hymn To Vena
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 102.297
    additional property: Musical Key
      type: PropertyValue
      value: 2
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 1
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.176
    additional property: Energy
      type: PropertyValue
      value: 0.042
    additional property: Speechiness
      type: PropertyValue
      value: 0.036
    additional property: Acousticness
      type: PropertyValue
      value: 0.98
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.052
    additional property: Liveness
      type: PropertyValue
      value: 0.077
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.034
    additional property: Loudness (dB)
      type: PropertyValue
      value: -27.192
    additional property: Key Name
      type: PropertyValue
      value: D
    additional property: Mode Name
      type: PropertyValue
      value: Major

Jakobs Stern ist aufgegangen. Weihnachtliche Chormusik
type: MusicAlbum
date published: 1992-08-01
track: Maria durch ein Dornwald ging
  type: MusicRecording
  duration: PT1M49S
  duration ms: 109000
  explicit: false
  by artist: Cesar Bresgen
  by artist: Katja Pieweck
  by artist: Karolina Huber
  by artist: Tanja Mertin
  by artist: Verena Grope
  by artist: Syrinx Ensemble
  by artist: Mädchenchor Hannover
  by artist: Ludwig Rutt
  by artist: Gudrun Schröfel
  in album: Jakobs Stern ist aufgegangen. Weihnachtliche Chormusik
    type: MusicAlbum
    date published: 1992-08-01
  popularity: 0
  isrc code: DEB119200112
  additional property: CopyrightID
  additional property: CopyrightStatus
    type: PropertyValue
    value: registered
  additional property: CopyrightRegisteredAt
    type: PropertyValue
    value: 2026-07-30T14:23:47+00:00
  additional property: CopyrightChainExplorerURL
    type: PropertyValue
    value: https://explorer.copyrightchains.com/tx/0x59d6ce6a8ef26dad6acba0916292ffc8891ba1a7eb59e855280602a51e9d3e6e
  additional property: OTSHash
  additional property: OTSBitcoinBlock
    type: PropertyValue
    value: 960266
  additional property: OTSBitcoinBlockVerifyURL
    type: PropertyValue
    value: https://blockstream.info/api/block-height/960266
  additional property: OTSVerificationAPI
    type: PropertyValue
    value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB119200112
  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-30T14:44:50Z
  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 0x59d6ce6a8ef26dad6acba0916292ffc8891ba1a7eb59e855280602a51e9d3e6e. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/DEB119200112.
    date published: 2026-07-30T14:44:50Z
  audio: Maria durch ein Dornwald ging
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 110.187
    additional property: Musical Key
      type: PropertyValue
      value: 7
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 0
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.289
    additional property: Energy
      type: PropertyValue
      value: 0.008
    additional property: Speechiness
      type: PropertyValue
      value: 0.05
    additional property: Acousticness
      type: PropertyValue
      value: 0.986
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.494
    additional property: Liveness
      type: PropertyValue
      value: 0.077
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.057
    additional property: Loudness (dB)
      type: PropertyValue
      value: -40.661
    additional property: Key Name
      type: PropertyValue
      value: G
    additional property: Mode Name
      type: PropertyValue
      value: Minor

Weihnachtliche Chormusik der Romantik (Arr. von Andreas N. Tarkmann)
type: MusicAlbum
date published: 2019-11-08

Weihnachten - Stille, stille, lasst uns lauschen
type: MusicAlbum
date published: 2017-11-17