{
  "manageEntity": {
    "action": "Save",
    "entityId": "1375811128",
    "entityType": "Track",
    "nonce": "0x8915851b8a8abe73885d918ad179b3fa9ba7169a95852ec148b35601b78a1f80",
    "signature": "0x60b3a2ef09bbff05ec1298e4ecf19845891b7d7ffcea523e550e2056232362d10dcca94cd621f2d771c11c329c443ffc1e7b15d8f89eec0becc1b876478ab8be1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}