{
  "manageEntity": {
    "action": "Save",
    "entityId": "496685",
    "entityType": "Track",
    "nonce": "0x0574a25edb2266ed3afd535b01dfced733a8481a2283b3301cc6291b318508bc",
    "signature": "0x1c155814b0a3eb8adef9b4fe7646630333a5364fd055eb61d2bd3d680b377311092b6b7cd6a0bba4fa50750dc9360f7cb0402bf0a66234d598c2fb44d9ec5ae71c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}