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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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25
common/initial_commit_tx.c
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@@ -223,17 +223,28 @@ struct bitcoin_tx *initial_commit_tx(const tal_t *ctx,
* output](#to_remote-output).
*/
if (amount_msat_greater_eq_sat(other_pay, dust_limit)) {
/* BOLT #3:
/* BOLT-a12da24dd0102c170365124782b46d9710950ac1 #3:
*
* #### `to_remote` Output
* 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
*
* This output sends funds to the other peer and thus is a simple
* P2WPKH to `remotepubkey`.
*...
* Otherwise, this output is a simple P2WPKH to `remotepubkey`.
*/
u8 *scriptpubkey;
int pos;
amount = amount_msat_to_sat_round_down(other_pay);
int pos = bitcoin_tx_add_output(
tx, scriptpubkey_p2wpkh(tx, &keyset->other_payment_key),
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);
output_order[n] = dummy_remote;
n++;