{
  "manageEntity": {
    "action": "Save",
    "entityId": "665723386",
    "entityType": "Track",
    "nonce": "0xa381095365a4b71c3103725a45e6589e071bb698dfc3938bdd0c7e433ef47e9a",
    "signature": "0x51ffb7c98380841e6b26d1e5c3fecc03d9912920a6f4b685480aa62187f964c26f10e4c4c1996272f75412c617615158904b0e84eb87b822906d7bbb2ae321661b",
    "signer": "0x14fa63A530B7d9254d20B110AAc25ABF49fbfa9d",
    "userId": "182428"
  }
}