Doing an SPV node messages over near-vertical incident skywave (NVIS) is technologically feasible, though not 100% reliable. Doing a full node is probably infeasible unless you use Blockstream Satellite or similar for the big messages.
Even full node update messages are too big for NVIS unless there are unusually good ionospheric conditions. (NVIS works via the ionosphere acting as a mirror for certain length radio waves. But the conditions are variable, the mirror gets fogged up to various degrees).
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I wonder if those challenges could be overcome by designing a sidechain that uses less bandwidth. Like LN optimizes for low speed/cost, the sidechain would optimize for low bandwidth.
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Ambitious but I think it could work, using less bandwidth and dealing with unreliable messages (retries and trying different routes). Possibly could use Lightning itself, although I haven't looked into that.
End of conversation
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