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onchaind: add BOLT 3 comment for fee calculations.

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Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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Rusty Russell
2018-04-04 05:50:57 +09:30
parent 1764d6c907
commit b4db228aa1
1 changed files with 12 additions and 0 deletions
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12
onchaind/onchain.c
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@@ -110,6 +110,18 @@ static u64 grind_htlc_tx_fee(struct bitcoin_tx *tx,
u64 input_amount = *tx->input[0].amount; u64 input_amount = *tx->input[0].amount;
for (u64 i = min_possible_feerate; i <= max_possible_feerate; i++) { for (u64 i = min_possible_feerate; i <= max_possible_feerate; i++) {
/* BOLT #3:
*
* The fee for an HTLC-timeout transaction:
* - MUST BE calculated to match:
* 1. Multiply `feerate_per_kw` by 663 and divide by 1000
* (rounding down).
*
* The fee for an HTLC-success transaction:
* - MUST BE calculated to match:
* 1. Multiply `feerate_per_kw` by 703 and divide by 1000
* (rounding down).
*/
u64 fee = i * multiplier / 1000; u64 fee = i * multiplier / 1000;
if (fee > input_amount) if (fee > input_amount)