[bisq-network/proposals] Proposal to increase trade deposit to 30% (#233)

[wiz]

The problem with using a 2 of 3 system for Arbitration is that the Arbitrators can steal all Bisq trade capital because they can just take all offers and then they have 2 of 3 keys. My proposal to keep the 2 of 2 model but have both parties create pre-signed timelocked payout TX for various scenarios, and encrypt these payout TXs to a group of trusted people who would all have to collude together to steal the funds, is also vulnerable to this attack, but using SSSS it would require several people to collude together which distributes the risk enough to make it much harder to do the attack. The risk can never be eliminated, so the only thing we can do is spread out the risk to more people and slow things down with timelocks.

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