{
  "manageEntity": {
    "action": "Save",
    "entityId": "140000649",
    "entityType": "Track",
    "nonce": "0x30f321d8b486e718db1ed7e9abbde1682a2b941751ed9b01711426762b3b1906",
    "signature": "0xacfafbe0ca69fa81592f510c4ebf2b470d94c36ca7754b6a3af4b1d6dc3736ef11e225fe7f9b46f28051820db3d036d738a656da948dfbb92539c20f85305f821b",
    "signer": "0x571CC6D512D6f6fe43A3EDFE62123a52785d36fA",
    "userId": "388520"
  }
}