{
  "manageEntity": {
    "action": "Save",
    "entityId": "397965",
    "entityType": "Track",
    "nonce": "0x89bc00dfeb22c30f15f8340cad426eb299d13502dffe324cee1b1a5e50c4a7a8",
    "signature": "0xd0e5c66319a2c7cbb43a685f60443e785fb919a7f4d033f59bb8809cb3de02d02d70a893b7708077b29a9ea3f8aa07eaa01d550d26e9d3515d72c5dcb816c67c1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}