{
  "manageEntity": {
    "action": "Save",
    "entityId": "1513749875",
    "entityType": "Track",
    "nonce": "0xcdf723e0068c28b311fb052733ed5b3cf67d9424a8110d4ea73c8e4c61bddc7b",
    "signature": "0x0bf8709fba9b7e6dbccb38ae2552fd8158559949f5e9e9d65b1ccd7d4a24793042ce03510d771563fb562b4195159b996248d3cd87e497fe01fee63451f6513e1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}