{
  "manageEntity": {
    "action": "Save",
    "entityId": "1023999289",
    "entityType": "Track",
    "nonce": "0x0691566ab7cd56d0e570a7ac396ebf96da6439bbf56119d69272660cc712b581",
    "signature": "0x7d187b6971452297b230772f4f40878a709c7c6901ac6a78e09c88270e74464227bcf80c5e6caae0a607e88f88c4e9ebe6d67e976f7fcd705d3f8892f75c0a531c",
    "signer": "0x1F9dC682fadBAc94c0Dd4ca2232a3f490704a737",
    "userId": "737872723"
  }
}