I agree that the self-custody onramp for Lightning is fairly advanced, too advanced for a newbie and definitely too much for grandma, which is partly due to it's early stage. To achieve self-custody for every average Joe and his grandma will be too much to ask with the existing paradigm. Instead, rollups are going to be necessary if automated/simplified LN nodes don't become dead simple.

As I said in another comment of mine on this thread, I would highly prefer a Bitcoin native solution over an "adapted" one. Whether BitVM is indeed that solution has yet to be seen, but I can be hopeful.

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I believe I recall Adam Back discussing some sort of Roll Ups as well but I can't remember the context. I guess that's my point with L1 and 2 scaling. Bitcoin is dynamic. L1 will scale dynamically, L2 as well. L1 scaled with Segwit. Lightning is scaling with embeded mobile nodes. Who knows, maybe lightning can onboard easily and self custodially with enough work (I don't think so because it requires channel management and again, this is my biggest critique of lightning). All this makes me excited for other solutions being proposed. Bitvm being one of the newest but also things like ARK. But to say Mainnet and Lightning "can't" scale in certain ways lacks an understanding that these protocols are actively changingand being worked on daily to do just that. These things will scale naturally as demand presents itself. Before 2016, exchanges didn't batch utxos. Now they do. Before last year, they didn't use lightning. Now they do. That's L1 and L2 scaling in response to natural free market incentives.