{
  "manageEntity": {
    "action": "Save",
    "entityId": "450117",
    "entityType": "Track",
    "nonce": "0x44789a1193eb42f9852532b353a478d5075be4cd29bd3dbbe97bf04a686b470a",
    "signature": "0x452a11723bf9154a907d791756af8e73164cd4a13636898e70c129eaadbd49f9540a76567de4dc5ecaa9a46645a56347cbd63b8dadde3685502b5c6b8c0fda4d1b",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}