{
  "manageEntity": {
    "action": "Save",
    "entityId": "2100177453",
    "entityType": "Track",
    "nonce": "0xc9db20a290cad4a5c99b9ebd09870d7eee085fafe482c96f5e9ffd2455e4f21f",
    "signature": "0x9139a6f76c75790425900139ec2410b412b8dadf7ea6f921fde552c2b38e991c7598c2d48c2e9f4df3d3d3456c257eef4a8b66618421d3ab7e1165f0a4770f611b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}