{
  "manageEntity": {
    "action": "Save",
    "entityId": "452955909",
    "entityType": "Track",
    "nonce": "0x5346f54d524e4a6a35a8d9031518ee7fd58106e6cab3f4d329bdc02ffefb421e",
    "signature": "0x54c92e1b0c3bd55511bba09130b7ba92f2e2462ee85851539b6744b068b0cdc8611dc42067c2002bbe79cb60973459279e219295de9a06cd6d95a29755f199641b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}