{
  "manageEntity": {
    "action": "Save",
    "entityId": "338132758",
    "entityType": "Track",
    "nonce": "0xf49476cdd20f54a48d5ab621838e62aa30f18100febff049af2410a222f1bac2",
    "signature": "0x2d13300b0766954284423396f3029ea30b6080867a353c12963a2edb03ef8df70a6c40dbc944f5aa0a89256c9ab10d46c20f95589fdce986f8c5bbe98a7f93cb1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}