{
  "manageEntity": {
    "action": "Save",
    "entityId": "1332725329",
    "entityType": "Track",
    "nonce": "0x83d464cb540ac409c92aecc99a7abfd6ce9d624cc8902c5515ee55c6b0a3c015",
    "signature": "0xd7b0895e6fce5d81b6135c79deab2f6ace93e81083bb8bd9aefeca07b36f95255f86e4c731cf9eb8e6fb3cf45e81477bb2c40b6012828a8fc6df78e212dba3e41b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}