I ran a full bitcoin node and lightning node on a raspberry pi 4 + 2TB external SSD. High cool factor, felt good to be supporting the network, but it was a lot of work, channel balancing was a pain (and fees expensive), and I didn't have enough liquidity or time to make it profitable. I may revisit in the future, maybe tools have gotten better, but I ended up shutting it down. I don't mean to discourage you--I'd do it again, I learned a lot and it was definitely fun, but go into it knowing what to expect.

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