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elements: fix gross weight differential.

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Firstly, we were not adding the extra fee output on our dummy tx,
because the fee amount was 0.  We probably should always do this, even
if it's 0.

Secondly, there are 6 witnesses, not 1, for elements txs.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2022-01-26 12:42:34 +10:30 • committed by Christian Decker
parent de28bbd792
commit a55cfab00d
1 changed files with 7 additions and 4 deletions
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11
bitcoin/tx.c
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@ -162,7 +162,7 @@ static int elements_tx_add_fee_output(struct bitcoin_tx *tx)
int pos;
/* If we aren't using elements, we don't add explicit fee outputs */
if (!chainparams->is_elements || amount_sat_eq(fee, AMOUNT_SAT(0)))
if (!chainparams->is_elements)
return -1;
/* Try to find any existing fee output */
@ -462,9 +462,12 @@ size_t bitcoin_tx_weight(const struct bitcoin_tx *tx)
/* If we don't have witnesses *yet*, libwally doesn't encode
* in BIP 141 style, omitting the flag and marker bytes */
wally_tx_get_witness_count(tx->wtx, &num_witnesses);
if (num_witnesses == 0)
extra = 2;
else
if (num_witnesses == 0) {
if (chainparams->is_elements)
extra = 7;
else
extra = 2;
} else
extra = 0;
return extra + wally_tx_weight(tx->wtx);