{
  "manageEntity": {
    "action": "Save",
    "entityId": "1812012811",
    "entityType": "Track",
    "nonce": "0x648af7a70c3b15e87b114c704a6b1e515166ee5520759adff8474cc06920b63e",
    "signature": "0x15811dfc78546650afa26b5a4cb934ed91bacd560380069d2ac27058a62482cc77a377defc6e6e08adc044e69ecbe4f85db588dd83f07ddd24a62eb3b430086d1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}