Yes, pretty sure if would need a hard fork!
True, but this is instead achieved on layer 2s, so the fork will likely never be required.
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Wen nano sats?!
Smth smth nano-lightning...sparks maybe?
Agreed. If 1 sat is ever valuable enough that we'd care, no one is going to be doing small transactions on-chain anyway. Millisats working just fine on Lightning already.