Herbert Kefer
type: MusicGroup
popularity: 4
followers: 19
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0xae4d905d2c13039d104b2d63f1976fe44eb531f4dce11f0d4b8ab41caba7ca41
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  value: 954533
additional property: OTSBitcoinBlockVerifyURL
  type: PropertyValue
  value: https://blockstream.info/api/block-height/954533
additional property: OTSProofURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/a652ac1a-82ab-4c38-9e51-772a86b979f4.ots
additional property: OTSRecordURL
  type: PropertyValue
  value: https://artists.proofprofile.net/proofs/artist/a652ac1a-82ab-4c38-9e51-772a86b979f4.json
additional property: OTSVerificationAPI
  type: PropertyValue
  value: https://artists.proofprofile.net/api/v1/bot/ots/verify/artist/a652ac1a-82ab-4c38-9e51-772a86b979f4
additional property: OTSTimestamp
  type: PropertyValue
  value: 2026-06-20T08:57:02Z
additional property: OTSCanonicalRecord
  type: PropertyValue
  value: {"copyright_id":"0xae4d905d2c13039d104b2d63f1976fe44eb531f4dce11f0d4b8ab41caba7ca41","name":"Herbert Kefer","registered_at":"2026-06-20T07:40:22Z","symbol":"NIM1557217","token_address":"0x6fe7da6b8f61e4b5c5b2ca09972d8febd1646252","type":"artist","uuid":"a652ac1a-82ab-4c38-9e51-772a86b979f4"}
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 0xae4d905d2c13039d104b2d63f1976fe44eb531f4dce11f0d4b8ab41caba7ca41. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a652ac1a-82ab-4c38-9e51-772a86b979f4.json and https://artists.proofprofile.net/proofs/artist/a652ac1a-82ab-4c38-9e51-772a86b979f4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-20T08:57:02Z
  text: {"copyright_id":"0xae4d905d2c13039d104b2d63f1976fe44eb531f4dce11f0d4b8ab41caba7ca41","name":"Herbert Kefer","registered_at":"2026-06-20T07:40:22Z","symbol":"NIM1557217","token_address":"0x6fe7da6b8f61e4b5c5b2ca09972d8febd1646252","type":"artist","uuid":"a652ac1a-82ab-4c38-9e51-772a86b979f4"}
album: Telemann, Weber, Baksa & Bruch: Viola Concertos
  type: MusicAlbum
  date published: 2017-02-03
  track: Andante e rondo ongarese in C Minor, Op. 35: I. Andante
    type: MusicRecording
    duration: PT4M37S
    duration ms: 277320
    explicit: false
    by artist: Herbert Kefer
    in album: Telemann, Weber, Baksa & Bruch: Viola Concertos
      type: MusicAlbum
      date published: 2017-02-03
    isrc code: GBAJU1700114
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-31T18:58:05+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0x6a7c5ed5324ac4b147ca21a845c8b641e33c2bb744d45d6626b990872e0f61e7
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      value: 960455
    additional property: OTSBitcoinBlockVerifyURL
      type: PropertyValue
      value: https://blockstream.info/api/block-height/960455
    additional property: OTSVerificationAPI
      type: PropertyValue
      value: https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAJU1700114
    additional property: OTSTimestamp
      type: PropertyValue
      value: 2026-07-31T19:53:13Z
    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 0x6a7c5ed5324ac4b147ca21a845c8b641e33c2bb744d45d6626b990872e0f61e7. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/GBAJU1700114.
      date published: 2026-07-31T19:53:13Z
    audio: Andante e rondo ongarese in C Minor, Op. 35: I. Andante
      type: AudioObject
      additional property: Tempo (BPM)
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        value: 121.265
      additional property: Musical Key
        type: PropertyValue
        value: 8
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.392
      additional property: Energy
        type: PropertyValue
        value: 0.06
      additional property: Speechiness
        type: PropertyValue
        value: 0.043
      additional property: Acousticness
        type: PropertyValue
        value: 0.99
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.68
      additional property: Liveness
        type: PropertyValue
        value: 0.058
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.299
      additional property: Loudness (dB)
        type: PropertyValue
        value: -25.499
      additional property: Key Name
        type: PropertyValue
        value: Ab
      additional property: Mode Name
        type: PropertyValue
        value: Major
  track: Andante e rondo ongarese in C Minor, Op. 35: II. Rondo ongarese
    type: MusicRecording
    duration: PT6M0S
    duration ms: 360080
    explicit: false
    by artist: Herbert Kefer
    in album: Telemann, Weber, Baksa & Bruch: Viola Concertos
      type: MusicAlbum
      date published: 2017-02-03
    isrc code: GBAJU1700115
    additional property: CopyrightID
    additional property: CopyrightStatus
      type: PropertyValue
      value: registered
    additional property: CopyrightRegisteredAt
      type: PropertyValue
      value: 2026-07-07T13:10:57+00:00
    additional property: CopyrightChainExplorerURL
      type: PropertyValue
      value: https://explorer.copyrightchains.com/tx/0xfdd078a10d81304f4a620f72d670eae01c62f10845d128a993e99e37158cf53b
    additional property: OTSHash
    additional property: OTSBitcoinBlock
      type: PropertyValue
      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/GBAJU1700115
    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 0xfdd078a10d81304f4a620f72d670eae01c62f10845d128a993e99e37158cf53b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAJU1700115.
      date published: 2026-07-08T03:20:19Z
    audio: Andante e rondo ongarese in C Minor, Op. 35: II. Rondo ongarese
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 110.927
      additional property: Musical Key
        type: PropertyValue
        value: 0
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 1
      additional property: Time Signature
        type: PropertyValue
        value: 5
      additional property: Danceability
        type: PropertyValue
        value: 0.554
      additional property: Energy
        type: PropertyValue
        value: 0.095
      additional property: Speechiness
        type: PropertyValue
        value: 0.05
      additional property: Acousticness
        type: PropertyValue
        value: 0.984
      additional property: Instrumentalness
        type: PropertyValue
        value: 0.766
      additional property: Liveness
        type: PropertyValue
        value: 0.08
      additional property: Valence (Positivity)
        type: PropertyValue
        value: 0.57
      additional property: Loudness (dB)
        type: PropertyValue
        value: -21.6
      additional property: Key Name
      additional property: Mode Name
  track: Romanze for Viola and Orchestra in F Major, Op. 85

Key Name
type: PropertyValue
value: C

Mode Name
type: PropertyValue
value: Major

Romanze for Viola and Orchestra in F Major, Op. 85
type: MusicRecording
duration: PT8M18S
duration ms: 498986
explicit: false
by artist: Herbert Kefer
in album: Telemann, Weber, Baksa & Bruch: Viola Concertos
  type: MusicAlbum
  date published: 2017-02-03
isrc code: GBAJU1700119
additional property: CopyrightID
additional property: CopyrightStatus
  type: PropertyValue
  value: registered
additional property: CopyrightRegisteredAt
  type: PropertyValue
  value: 2026-07-06T20:14:08+00:00
additional property: CopyrightChainExplorerURL
  type: PropertyValue
  value: https://explorer.copyrightchains.com/tx/0x21da0174d4a6d8f29e6d921e445a3ff017003089d1395e882fe5de6889168b29
additional property: OTSHash
additional property: OTSBitcoinBlock
  type: PropertyValue
  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/GBAJU1700119
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 0x21da0174d4a6d8f29e6d921e445a3ff017003089d1395e882fe5de6889168b29. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAJU1700119.
  date published: 2026-07-08T03:20:19Z
audio: Romanze for Viola and Orchestra in F Major, Op. 85
  type: AudioObject
  additional property: Tempo (BPM)
    type: PropertyValue
    value: 104.425
  additional property: Musical Key
    type: PropertyValue
    value: 5
  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: 0.095
  additional property: Speechiness
    type: PropertyValue
    value: 0.041
  additional property: Acousticness
    type: PropertyValue
    value: 0.988
  additional property: Instrumentalness
    type: PropertyValue
    value: 0.895
  additional property: Liveness
    type: PropertyValue
    value: 0.089
  additional property: Valence (Positivity)
    type: PropertyValue
    value: 0.075
  additional property: Loudness (dB)
    type: PropertyValue
    value: -24.49
  additional property: Key Name
    type: PropertyValue
    value: F
  additional property: Mode Name
    type: PropertyValue
    value: Major