{
  "manageEntity": {
    "action": "Save",
    "entityId": "956857320",
    "entityType": "Track",
    "nonce": "0x6573ff23f5d26a13685801bc80b99bccefe966680c426dcebfbefd6a59a8a7db",
    "signature": "0x3c15f7e7e370ef658480fb70576418dda3e0c031530f3d3e6ce2ef786e097d620af711a46e071a9a61d9862d21d323efd8c9eedacff062a63123ecc4a39402b01c",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}