First I heard of Mercury.
Liquid's been in operation for years without any hiccups that I can recall. WBD with Anita Posch just clued me in that there are options to swap into lightning using it. Add that it seems promising for asset issuance and I think the choice is clear between these two.
Mercury has been in development for several years. There were articles and videos about "statechains" four years ago, which is what turned into "Mercury".
I wouldn't expect Liquid to have any major "hiccups" just yet. FTX, GOX operated for years "without issue"...
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Development != use.
Still have reservations about sidechain integrity but with time and knowledge Liquid seems to be getting there.
I didn't consider that Liquid might rug everyone and lead to a decade of litigation. Is Mercury immune to that?
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not as far as I know. They are very "centralized" but talk about a federated option. They also say that because of a special chip they use, private keys are not seen and are securely destroyed. While that's probably true, I don't see how it can ever be very distributed beyond an authorized federation, which is no better than Liquid from a centralization standpoint (though you still have the emergency unilateral recovery of funds with Mercury that you don't have with Liquid).
Liquid seems fine as a "service" but I don't consider it a scaling solution for Bitcoin that lives up to the values of Bitcoin.
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