With Ark fast off-chain transactions are limited to your ASP "island". Lightning then connects those "islands" together so you can also pay your friend who is using a different ASP offchain. I think there will never be the situation with just one Ark Service Provider. And if there was, such a centralization is bad...
You saying with Ark I can only pay within ASP island? I don't think that's true. Can someone confirm this? I thought ASP is basically a coinjoin coordinator but you can switch the coordinator at anytime.
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I mean you can pay anyone with the vTXO, but in my understanding that recipient implicitly also becomes a "user" of that specific ASP. You trust that ASP to not do something nasty (like double-spend). If it does you don't lose your funds but it still gets expensive since you need to unilaterly exit to base layer. The better way to sweep if you have funds with ASP1, ASP2 and ASP3 whom you trust is to do an AMP lightning payment.
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