{
  "manageEntity": {
    "action": "Save",
    "entityId": "399191494",
    "entityType": "Track",
    "nonce": "0x40ace0bbde894ef01eb67d6b90c5e3152270a8c822a8d47787cfcdc20b920bbb",
    "signature": "0xd249b16827e471c954db72f107f51109e3f956c6196e33295ca2c6115984235f46ae344af0d02c3f5a54d67c9ddb56dc1604ad78f4296b99a5fb6d20450957ac1c",
    "signer": "0x482e2A094d66508c2cB0BFE5a5C7535F11846145",
    "userId": "218853"
  }
}