i only know the lightning related software the other ones i have never heard of.
I just pegged a few sats into Liquid, just to give it a try.
Apparently, the total capacity of the visible Lighting network is now a little over 4000 BTC, while Liquid now has a little over 3500 BTC pegged in [1].
So purely by these visible metrics,I would say they are toe-to-toe.
But Liquid feels like a dead project. I never hear anything exiting about it? The best they can do is have a few centralized stablecoins running over it.
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I use liquid yes, but I wouldn't use RSK or stacks, they are NOT second layers, they are remora chains, affinty scams that are trying to leverage bitcoin to sucker people into thinking they're still within the network
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RSK is not a remora chain becaus it doesn't create a new economic token. It is a sidechain of Bitcoin. Stacks may be a remora but it doesn't reach to that level. I recommend the following explanation by Sergio Damian Lerner. https://medium.com/iovlabs-innovation-stories/bitcoin-sidechains-74a72ceba35d
To my knowledge all of this is pretty niche. Wouldn't put my time into it until it is clear if some of them succeed.
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RSK is a sidechain of Bitcoin. As more BTC are given to the sidechain more rBTC are minted, while if you burn rBTC you can get away with BTC again. rBTC prodives turing complete. It's like a programable BTC, the price is attached to BTC.
STACKS, is proof of transference. They use their own token called STX that also provides programmability. To produce each block in the blockchain of Stacks you need BTC. The difference is that Stacks has its own price (variable).