{
  "manageEntity": {
    "action": "Save",
    "entityId": "210021",
    "entityType": "Track",
    "nonce": "0x844f92e4015a09b3264250a152041a6eb49a86bd838d2623b6fed0724aa7d761",
    "signature": "0x925806a5dfca9970db22820cccf1888ce3d6dd849c93cf0534b65d25b4b50e004a0a0e840585fa2db1ba7a2885ea28ef78346137751941a4f934a83664d84f721c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}