{
  "manageEntity": {
    "action": "Save",
    "entityId": "458283808",
    "entityType": "Track",
    "nonce": "0x40744c5d21ef1e1f9b64a0d0f7c91cd8c2af5e37508fdf2a5bbeff8f67b92195",
    "signature": "0xacfd28a800b24e0176b3ab89a8db5fefd5b989df8008f73aab205a08c649d4ea6ee1acd1235da74db8d2b6040a996308f31e8ef809b2e61de0e5c1845238d75e1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}