This is exactly what is done! This was known about and discussed in 2013: https://bitcointalk.org/index.php?topic=285142 https://bitcointalk.org/index.php?topic

This is exactly what is done! This was known about and discussed in 2013: https://bitcointalk.org/index.php?topic=285142 https://bitcointalk.org/index.php?topic=285142 At the end of the day nothing can be achieved if you don't have a trusted device to compare your untrusted device against. Bitcoin's threat model assumes that the client device is trusted.