{
  "manageEntity": {
    "action": "Save",
    "entityId": "333901",
    "entityType": "Track",
    "nonce": "0x299467152cec1398d1c394a0fbb3624a2dc01cd48601c314c08902635b325029",
    "signature": "0x9b1d75af2eb85d072a8ebe809d86c2fc53ea8cb68e5eb9287a52b6bbc9a15be4105b0bdd74c9935a9dac4b08600951e3d9cf8e4f8dbec6b12e38d9d34828f0681c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}