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Nope. Drivechains can be attacked with less than 51%
A 51% attack can't steal from liquid but it can steal from a drivechain
A 51% attack certainly could steal from the liquid multisig via double-spending.
You'd probably need more than 51% to attack Liquid.
Pegging in BTC to Liquid requires 102 confirmations. Even if an attacker had 51% of the hashrate it'd probably be insanely difficult to cause a 102 block reorg.
You'd probably need way more than that, but I'm not sure how much. Also Liquid could just increase the amount of confirmations required more and more if a potential 51% attack is underway
Okay, a miner can steal back their funds. But they can't just take everything that is custodied in the chain
drivechain does not require legal representation or trusted parties
it just requires people to behave in an honest way out of self-interest.
Completely false. You are giving up custody to miners, they become trusted 3rd parties.
The risk to sidechains is a 51% attack, same as the main chain itself.