{
  "manageEntity": {
    "action": "Save",
    "entityId": "773574059",
    "entityType": "Track",
    "nonce": "0xd7f0eef378768f22bcdd83ed192c6b448e6b58587a7356fb599a4c9cc724db04",
    "signature": "0xfb7a300dafda3b417c60336a37173b3df5da80f2e05883924ae28d4000b6c21d456349007a47852032f86e967cadf5a009978f9b473eeee08071c0c61d4173101b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}