{
  "manageEntity": {
    "action": "Save",
    "entityId": "999972",
    "entityType": "Track",
    "nonce": "0x3f8d392ab69b8c7ec1cb9beaec1f026449d4bc92002c08829038d4acf5bcec33",
    "signature": "0xb21537216eb7db5cce388e7d7e79ea1b474b49f75711b730ce4a47d3498c150c59383fd44d13aac675e3ff51b72421dd97719f9db0a290eb3843d5ab9867196d1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}