{
  "manageEntity": {
    "action": "Save",
    "entityId": "671563544",
    "entityType": "Track",
    "nonce": "0x1753b5fcfdf068e7c150e334c6be04de6b3389fdf15fb51a25f3b3b117a59022",
    "signature": "0xcb2a3d1340086c19e13ef9d42c51646220a19ab554cf685e724f4f7399e0ea743f584cc1ef52f635edbebf617634409cb87b23d5a79b0e31b37b1cbca32767a61b",
    "signer": "0x775bA7FB8a4FF9354c099465ca493BA949FdAca6",
    "userId": "597677270"
  }
}