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Intermediary nodes see the payment amount for the specific HTLC traversing their channel, as well as Timelock deltas. This is necessary for them to create the outgoing HTLC to the next hop (on the chosen path).
afaik most payments are not multi-path so intermediate nodes in most cases do know the payment amount roughly. I suspect multi-path payments to increase a lot though which should help this some.
Correct. Wallets could be modified to favor multi-path payments. But single path is somewhat cheaper. Probably faster and more reliable for small payments too. But that's a complex topic that I don't 100% understand.
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A CLN node have by default MPP activated. Zeus and Blixt also have a specific option to activate MPP for all payments. MPP are good not only for more privacy but also to a proper liquidity management.
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