{
  "manageEntity": {
    "action": "Save",
    "entityId": "264199",
    "entityType": "Track",
    "nonce": "0xfcb95b8edfcb7290d1ce56f2aa44176742c1c8ee62bdf6c8c105e6f3cd727006",
    "signature": "0x9a8736ba44e33e5fd37c9e43183bf7fcc9d7a7d89a957f6f8c8b03a2cba44c955d7b3d50b09634b2627ec4364d4a72cdbf056822230428a48d148ca914bb3a071b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}