{
  "manageEntity": {
    "action": "Save",
    "entityId": "1890801652",
    "entityType": "Track",
    "nonce": "0x0b4b780372dca334a8757a6819a0e6c2f1e821c50286e2830008fc80509c78cf",
    "signature": "0x82f32c61ed4c142afc8d9b63c703c755ef1112d43a2a09e9b8e6b67cebd4232c16af6d027c092dd685bfdddf173299e175ba9637b641492c20468adb21488b361c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}