{
  "manageEntity": {
    "action": "Save",
    "entityId": "1390696618",
    "entityType": "Track",
    "nonce": "0xfb77c877d55fd27ce324b8ba081ec8f2362106fa67e78d7278fc19a074a3f063",
    "signature": "0x30248f7e3294980bbe5328fdd503f107002a1871ea603048cbd046a90b440b3e300c292ac91bab7cbee39d47a95dd4544b8d27401da2efaf44e97ec3a00955291c",
    "signer": "0xC35123bF05ca0B3A7B333c53E47bcd9f9DA864d4",
    "userId": "33896318"
  }
}