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Nano has alwas has a computational part associated with transactions. It once was used to prioritize transactions. Nano has evolved to a different prioritization scheme. That computational part will be phased out.
The lightning network is a silly attempt to merge bad parts of cryptocurrencies with bad parts of traditional finance: you need the electric energy guzzling Bitcoin and middlemen just like in traditional finance - or would you care to open and close your own channels, pay watchtowers etc. or "simply" use the channels of middlemen?
And how would you have cheap transactions without those middlemen, if operating your own channels requires transactions on layer 1?
We'll see. It had to be "phased in" in the first place for a reason. Either you limit chain space and charge for it, or your chain grows an infinite size. There is no way around that problem.
Because once a channel is opened, you can have essentially infinite transactions within it. So there is not a 1:1 relationship between channel opening/closing costs (layer 1) and transaction relaying costs (lightning). You need the layer 1 underneath to provide the security for the lightning transactions. Without layer 1, if somebody you are transacting with doesn't follow the rules, you have no way to enforce the rules. Incentives are setup in such a way that it's incredible rare you ever need to to go L1 to get that enforcement, since the deck is stacked against anybody who tries to break the rules.
I stated the reason for it being phased in: prioritizing transactions.
Tell me how to keep a channel open without risking loss of funds through flood and loot attacks.
The attacks you can do in lightning are very limited. Basically the only one you can do is force close a channel and broadcast an old state on-chain. But your other party in the channel can correct you by publishing the more recent state. They have several days to do this. If you tried to cheat this way, not only do you not get the coins you wanted, but there is a penalty as well. You lose money. So nobody ever does it.
There's about 200M USD currently locked up in lightning contracts. If you think you can hack lighting, have at it. The best hackers in the world have tried, they have all failed.
https://bitcoinvisuals.com/ln-capacity