{
  "manageEntity": {
    "action": "Save",
    "entityId": "973926869",
    "entityType": "Track",
    "nonce": "0xdf98559f5379dbd96b394b866fd1596d4b06365e10cb6f69d49ca1f532f4865d",
    "signature": "0xeab5092aca8552a72d474423ca1f5ce72822a08f9f04945ac55136214bb8f7d34aae7c447f2acf8c5ba3e248903997d95525fd2f17c20c406f7776f6dc66be241b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}