{
  "manageEntity": {
    "action": "Save",
    "entityId": "453990557",
    "entityType": "Track",
    "nonce": "0x83457ea6991a4245cf5c4ce516e40b1bfcb6abb78f6849f04d29a6f49592efd5",
    "signature": "0xcb53923a34f7f9d2c76d5ef0b4503ce254a255e887219b1ac834b434bcff897a61d4d8acc862df5ae99f4a89955bf84677b4b73514d9aee425e9df530c8ee7371b",
    "signer": "0xAD70397544Ee4e82a6AB7EA8365282a449a99DBD",
    "userId": "640375784"
  }
}