Post
Topic
Board Development & Technical Discussion
Re: Atomic swaps using cut and choose
by
TierNolan
on 02/03/2016, 22:45:39 UTC
There are some egregious distinctions.

  • Attacker identifies his own UXTO which the community can then decide to blacklist with a checkpointed fork. Thus taking away the attackers income and causing the attack to be a loss.
  • Attacker will have a very difficult time purchasing things at sufficient scale that doesn't identify him in the real world. Whereas stealing balances will be impossible to prove for cut & choose
  • The victims can prove they were double-spent by long-range chain reorganization. This isn't an absolute proof of an attack, but community evidence gathering at any sufficient scale of attack should come to a consensus about the existence of an attack.

(Again, I don't see how this attack is specific to cut and choose.)

The problem is fundamental to block chain crypto-currencies.  They inherently use a single validation (POW) to cover lots of transactions.  The security assumption is that no one attacker can controls enough of the transactions to make roll back worth it.