{
  "manageEntity": {
    "action": "Save",
    "entityId": "214775",
    "entityType": "Track",
    "nonce": "0x151e031af8b2fe5aa0aaf450a49ef50821a3a543728f073e6cf14d4a45bc5013",
    "signature": "0x1973b32a3d1cde1665a9d89b316a75525757ce33a88c03ac9609d5d35a9bf19b4fd2a36b88942cad7cbf6bf98523c85030c07ca8ba38c50221bc40ad0af2730c1b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}