What are the security downsides of not having a full Bitcoin Code node backing your LN?
How can an attacker (including a malicious LN peer) that knows your setup, exploit it?
None. A LN node only needs a repository from where to read blocks and keep up the sync. It doesn't matter if is a full node with local blocks storage or neutrino.
Exploit what?
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I don't know, it's why I'm asking.
I just know that if you're not running a full node, you're obviously making a security tradeoff and I'd like to know how can this bite me back?
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It all depends what do you want to do/obtain. My guide about using LNbits with a neutrino + LN node is dedicated for those who want a quick install for a LNbits for a shop/business. It is not a general rule. Please read the links inside the guide to understand further the case.
security tradeoff and I'd like to know how can this bite me back?
Breez, Zeus and Blixt mobile nodes are using neutrino. And are just fine. Same works for a desktop LN node.
Using a full core node have other practicalities but not always you need a full node, just to transact over Bitcoin network.
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