{
  "manageEntity": {
    "action": "Save",
    "entityId": "439563010",
    "entityType": "Track",
    "nonce": "0x5ffe12d535c13c9610a04681279f45b58f229ad4b73b510d8ce922c3715291a1",
    "signature": "0xc7848ddab9dc195fac2985ff9c47d3a8fa9f1aa570be812ecb106a039f4febac31bda71921365433007234b13155771fdae448002fc4f27e6803ad4f11b0e0de1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}