{
  "manageEntity": {
    "action": "Save",
    "entityId": "336524",
    "entityType": "Track",
    "nonce": "0x0400f714c0d07c1af16aaa829677f57f7a5a1b1969f5f68095c704c3dacfb7dc",
    "signature": "0xcc072f1049deb1e2942e395ad029ec2f3a250a24267aa44c4af6a4195345603814e85c762bbdd339b1d97712258006095d69f922cc087de72ab1e5a19e623b9a1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}