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initial_commit_tx, commit_tx: add anchor outputs if needed.

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This also means we subtract 660 satoshis more everywhere we subtract
the base fee (except for mutual close, where the base fee is still
used).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2020-08-14 03:17:02 +09:30
parent 222d018b1a
commit e7423888ba
11 changed files with 268 additions and 30 deletions
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25
bitcoin/script.c
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@@ -23,6 +23,7 @@
#define OP_ENDIF 0x68
#define OP_RETURN 0x6a
#define OP_2DROP 0x6d
#define OP_IFDUP 0x73
#define OP_DEPTH 0x74
#define OP_DROP 0x75
#define OP_DUP 0x76
@@ -788,6 +789,30 @@ u8 *bitcoin_wscript_htlc_tx(const tal_t *ctx,
return script;
}
u8 *bitcoin_wscript_anchor(const tal_t *ctx,
const struct pubkey *funding_pubkey)
{
u8 *script = tal_arr(ctx, u8, 0);
/* BOLT-a12da24dd0102c170365124782b46d9710950ac1 #3:
* #### `to_local_anchor` and `to_remote_anchor` Output (option_anchor_outputs)
*...
* <local_funding_pubkey/remote_funding_pubkey> OP_CHECKSIG OP_IFDUP
* OP_NOTIF
* OP_16 OP_CHECKSEQUENCEVERIFY
* OP_ENDIF
*/
add_push_key(&script, funding_pubkey);
add_op(&script, OP_CHECKSIG);
add_op(&script, OP_IFDUP);
add_op(&script, OP_NOTIF);
add_number(&script, 16);
add_op(&script, OP_CHECKSEQUENCEVERIFY);
add_op(&script, OP_ENDIF);
return script;
}
bool scripteq(const u8 *s1, const u8 *s2)
{
memcheck(s1, tal_count(s1));