99% Fault Tolerant Consensus Observers

[K-Ho]

Create a script for section 2.3 to implement the attack described in https://vitalik.ca/general/2018/08/07/99_fault_tolerant.html

Create an observer client that just checks the timestamp and rebroadcasts messages (doesn't sign)

"In the case where one node is honest, can we guarantee that passive observers (ie. non-consensus-participating nodes that care about knowing the outcome) can also see the outcome, even if we require them to be watching the process the whole time? With the scheme as written, there’s a problem. Suppose that a commander and some subset of k (malicious) validators produce a message v : i[1] : .... : i[k], and broadcast it directly to some “victims” just before time T + k * D. The victims see the message as being “on time”, but when they rebroadcast it, it only reaches all honest consensus-participating nodes after T + k * D, and so all honest consensus-participating nodes reject it."