{
  "manageEntity": {
    "action": "Save",
    "entityId": "713529373",
    "entityType": "Track",
    "nonce": "0x1307f408a691a083d1510a0a793101c7446044dac01b8663e577da203606c398",
    "signature": "0xcf0da09b0a44fef6db247edbb4392abd7d50728ed92d485c56fc3804f070d0d96d08c0cf9c1a1060840469a0aaf6ff2e409429da8aa99b802bec8fa4b67046811c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}