{
  "manageEntity": {
    "action": "Save",
    "entityId": "666138",
    "entityType": "Track",
    "nonce": "0xb1b7b1c9d20ef94db186c802aa1fc8d0e8e4453aa466445efb8836da5cd1d325",
    "signature": "0x7caaf1a0247b6a168818a0d35f6d648c6de0172650fa1c46211d23fdb00a3dc131ca81348b72edae254dc4b3fea61f7fed9c31f5ba17f8d495d078fdf8830def1b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}