{
  "manageEntity": {
    "action": "Save",
    "entityId": "1612918640",
    "entityType": "Track",
    "nonce": "0x1535de8a2b7c94b7390ae53499908bae919ebd6b93367fd4f389ce7d87149247",
    "signature": "0x4f93df1b3c4e76fadf7cb1d606ab83952463379573f34d61e0f408130d500aae3840e0c072e99effbfcc7aaaba64b13450b8f23febf91a641fb564071f17cb241b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}