{
  "manageEntity": {
    "action": "Save",
    "entityId": "1620284955",
    "entityType": "Track",
    "nonce": "0x83a8942fc4f10bbfd0d9d1ac10bf2867b28f82a1ddcccf4872c7b4924f55381f",
    "signature": "0x9032b9c5b641a2f1405e85d033c637918f6ef848033a643bf23275f7307dd84464f662e14fb6acae7b46a36c8d55a5f9f4dbc4c5bcd98f0734ee2c685a4599dc1b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}