{
  "manageEntity": {
    "action": "Save",
    "entityId": "420927904",
    "entityType": "Track",
    "nonce": "0x966e0ca2871000dd1806e42e81c935c9440b03a57fe9d99b5ea9460b716aa1eb",
    "signature": "0x0f3714a0ac47753c0146c38ff263c322fd104d7ed1bcf00b1063e3a54e0481773eb1ec86bd15babfd62ab8eaf7d602025439ee9be90af230ae5470199bf11a731b",
    "signer": "0xd85E4A094e4C057572A9D525C9737051A17ab609",
    "userId": "696716320"
  }
}