{
  "manageEntity": {
    "action": "Save",
    "entityId": "439389263",
    "entityType": "Track",
    "nonce": "0xff037e9e25dadafb5cb57f1f1008109483e184658e0b0e541657b2450197ba7c",
    "signature": "0xcd05f2cb125264d2ba829f4961aa8801872dd5d68253377133e96834bf78d5da0cd38b224d476c7a716d56d2bbcc91d865a25cc6af44923cf5793e846c0f0d961c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}