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Correct fee calculation in BOLT 7

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The fee calculation in BOLT 7 appears to imply that proprtional
fees must be paid on the incoming amount, not the to_forward amount

This is inconsistent with what is actually implemented in the
field (which uses amount_to_forward) and also would make
pathfinding more complicated as the fee would depend on itself,
making calculation no longer simple.
This commit is contained in:
Matt Corallo 2018-08-27 15:40:09 -04:00 committed by Rusty Russell
parent 0bb2739133
commit 2b253f7a61
1 changed files with 2 additions and 2 deletions
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4
07-routing-gossip.md
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@ -768,7 +768,7 @@ In the case where the `channel_announcement` is nonetheless missed,
The origin node:
- SHOULD accept HTLCs that pay a fee equal to or greater than:
- fee_base_msat + ( amount_msat * fee_proportional_millionths / 1000000 )
- fee_base_msat + ( amount_to_forward * fee_proportional_millionths / 1000000 )
- SHOULD accept HTLCs that pay an older fee, for some reasonable time after
sending `channel_update`.
- Note: this allows for any propagation delay.
@ -900,7 +900,7 @@ to do so here, for the sake of simplicity:
pay B the fee it specified in the B->C `channel_update`, calculated as
per [HTLC Fees](#htlc-fees):
fee_base_msat + ( amount_msat * fee_proportional_millionths / 1000000 )
fee_base_msat + ( amount_to_forward * fee_proportional_millionths / 1000000 )
200 + ( 4999999 * 2000 / 1000000 ) = 10199