{
  "manageEntity": {
    "action": "Save",
    "entityId": "1358040147",
    "entityType": "Track",
    "nonce": "0x66c8ce65525df448486826069b8c4a872bb6e982099aa94a2f3e034405b6749a",
    "signature": "0xd6a078ac31a2331c5a86d55f185230c955c11574c5668cf5c19d04a50591ff38764db9ac05aa7f2fe05a745ab5670c0cf2497f24c6e47600ae5c217b792bb5be1c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}