{
  "manageEntity": {
    "action": "Save",
    "entityId": "780484927",
    "entityType": "Track",
    "nonce": "0xa15509a61863bcb0c57a982573c6f976454cc7a41c65a81f70605895530e19d1",
    "signature": "0x7a40ca90ccc1f9eeb68aa2998c560fc7b19e439d19b3b5c4b8f5a75ddbc84b8e490ba02f09c288d19d8daaf6848adb319df95be684d146db65fdf777bfd420a61b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}