Specification of ForceMove to exhibit safety. #2
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At this point, by front-running, Eve can force an infinite loop of forceMoves, where Alice has no choice but to call refute. Since refute does not increment the channel's turnNumber on chain, this creates an infinite loop.
At this point, if Alice has commitments {5,6} and Eve calls
ForceMove(5), then Alice can't refute, and instead needs to respond with
a move.
Once the channel is in the CHALLENGE mode with the latest turn number, Eve would be forced to either - respond with a move (which Alice is ok with) - respond with an alternative move, providing a full round (which Alice has to be ok with, since she signed one of the commitments in that round, and has no control over the later commitments) - refute with a later state signed by Alice (which she can't)
(Some of the algorithm overflows currently.)
There's no need to define it as a constant and then check that it's a participant's IDX. Plus, this way, models exhaustively check all positions of Alice in the participants array.
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