{
  "manageEntity": {
    "action": "Save",
    "entityId": "1490260307",
    "entityType": "Track",
    "nonce": "0x63ae9c75b0961a176fcc79f8bb5874eb471232512e97b4824cbcf88c96ea170e",
    "signature": "0x11d577f635852c3bdcf4cbd9382b537d40aece953463759117f7761afaa940c11ff6c1c0c25c97a5aeb4008ee940527933613a10ad822f8235041dba77e972af1c",
    "signer": "0x399A86aB5cb2d59C2C1608739db566ef39E2A50f",
    "userId": "39437"
  }
}