{
  "manageEntity": {
    "action": "Save",
    "entityId": "476370043",
    "entityType": "Track",
    "nonce": "0xbe906af30bb6146f62e32030b783711eaedcf04cbfd2a03828c7ef83c595a1d6",
    "signature": "0xec96acae98e357fc702d0b504b672340f0d9bea859b8731ee7e70a2446d505fe54a2cdf80d3556eefbcadcf27f5eec9e81264f9a5094e422f190ed48faea59f71b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}