{
  "manageEntity": {
    "action": "Save",
    "entityId": "323877822",
    "entityType": "Track",
    "nonce": "0x8057e51fbf4b128777f38affa9b375c853ec0e8c833c768b153fb84cd9072d2e",
    "signature": "0x9d994341f1f212f4af4eda1f28cba9cc619c525682f5fc456d466f234adb2c5d70fb7b59cf485bebbc4f452b8f3fed621798a362aaffcd9267fbfddf47de3fdc1c",
    "signer": "0x2D566E1DaC6fc148a694abe846B32e39B6584aa5",
    "userId": "890889753"
  }
}