Better threat different offchain signed votes for same proposal

[3esmit]

Currently, signed votes are included with no verification to reduce the cost. This should stay as it is.

The problem with this is that it allows a voter to submit 2 different votes, and the tabulation would get into a race condition.

Currently the first tabulated would be the accepted. The retabulation is prevented by this line:

topic-democracy/contracts/democracy/proposal/ProposalBase.sol

Line 87 in 03da756

require(voteMap[_voter] == Vote.Null, "Already voted");

This is a problem because delegates could vote for something and later change their minds, making community not be able to quickly follow their actions. Also putting the tabulation in a unpredictable outcome for that account influence (and delegated influence).

Its not a security problem, however it can help delegates to mislead their vote at votingPeriod.

A option would be to burn the vote (or make it a blank vote). The problem is if there is already indirect influence claimed.