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channeld: change to_remote for option_anchor_outputs.

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It's now a P2WSH to incorporate a CSV 1 delay.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2020-08-14 03:18:02 +09:30
parent e7423888ba
commit 3ff8311b40
4 changed files with 64 additions and 14 deletions
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27
channeld/commit_tx.c
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@@ -260,21 +260,34 @@ struct bitcoin_tx *commit_tx(const tal_t *ctx,
*/
if (amount_msat_greater_eq_sat(other_pay, dust_limit)) {
struct amount_sat amount = amount_msat_to_sat_round_down(other_pay);
u8 *p2wpkh =
scriptpubkey_p2wpkh(tx, &keyset->other_payment_key);
/* BOLT #3:
u8 *scriptpubkey;
int pos;
/* BOLT-a12da24dd0102c170365124782b46d9710950ac1 #3:
*
* #### `to_remote` Output
*
* This output sends funds to the other peer and thus is a simple
* P2WPKH to `remotepubkey`.
* If `option_anchor_outputs` applies to the commitment
* transaction, the `to_remote` output is encumbered by a one
* block csv lock.
* <remote_pubkey> OP_CHECKSIGVERIFY 1 OP_CHECKSEQUENCEVERIFY
*
*...
* Otherwise, this output is a simple P2WPKH to `remotepubkey`.
*/
int pos = bitcoin_tx_add_output(tx, p2wpkh, NULL, amount);
if (option_anchor_outputs) {
scriptpubkey = scriptpubkey_p2wsh(tmpctx,
anchor_to_remote_redeem(tmpctx, &keyset->other_payment_key));
} else {
scriptpubkey = scriptpubkey_p2wpkh(tmpctx,
&keyset->other_payment_key);
}
pos = bitcoin_tx_add_output(tx, scriptpubkey, NULL, amount);
assert(pos == n);
(*htlcmap)[n] = direct_outputs ? dummy_to_remote : NULL;
/* We don't assign cltvs[n]: if we use it, order doesn't matter.
* However, valgrind will warn us something wierd is happening */
SUPERVERBOSE("# to-remote amount %s P2WPKH(%s)\n",
SUPERVERBOSE("# to-remote amount %s key %s\n",
type_to_string(tmpctx, struct amount_sat,
&amount),
type_to_string(tmpctx, struct pubkey,