lightningd/json_withdraw:

Add the change output to owned_txfilter so its entry in db will
get a confirmation_height when detected in a block by filter_block_txs

before this commit, after a 'withdraw' command, 'listfunds' would
not show our change outputs as confirmed

Modified the log message in wallet_extract_owned_outputs to
append 'CONFIRMED' when it is called with a blockheight arg.
To make distinction between (1st call) when adding owned output to the
db and (2th call) when confirmed in block.

wallet/wallet.c

@@ -1132,11 +1132,11 @@ int wallet_extract_owned_outputs(struct wallet *w, const struct bitcoin_tx *tx,
 		utxo->blockheight = blockheight?blockheight:NULL;
 		utxo->spendheight = NULL;
 
-		log_debug(w->log, "Owning output %zu %"PRIu64" (%s) txid %s",
+		log_debug(w->log, "Owning output %zu %"PRIu64" (%s) txid %s %s",
 			  output, tx->output[output].amount,
 			  is_p2sh ? "P2SH" : "SEGWIT",
 			  type_to_string(tmpctx, struct bitcoin_txid,
-					 &utxo->txid));
+					 &utxo->txid), blockheight ? "CONFIRMED" : "");
 
 		if (!wallet_add_utxo(w, utxo, is_p2sh ? p2sh_wpkh : our_change)) {
 			/* In case we already know the output, make

wallet/walletrpc.c

@@ -60,6 +60,8 @@ static void wallet_withdrawal_broadcast(struct bitcoind *bitcoind UNUSED,
 		 * generated the hex tx, so this should always work */
 		struct bitcoin_tx *tx = bitcoin_tx_from_hex(withdraw, withdraw->hextx, strlen(withdraw->hextx));
 		assert(tx != NULL);
+
+		/* Extract the change output and add it to the DB */
 		wallet_extract_owned_outputs(ld->wallet, tx, NULL, &change_satoshi);
 
 		/* Note normally, change_satoshi == withdraw->wtx.change, but
@@ -95,6 +97,8 @@ static struct command_result *json_withdraw(struct command *cmd,
 	struct withdrawal *withdraw = tal(cmd, struct withdrawal);
 	u32 *feerate_per_kw;
 	struct bitcoin_tx *tx;
+	struct ext_key ext;
+	struct pubkey pubkey;
 	enum address_parse_result addr_parse;
 	struct command_result *res;
 
@@ -143,6 +147,18 @@ static struct command_result *json_withdraw(struct command *cmd,
 	if (res)
 		return res;
 
+	if (bip32_key_from_parent(cmd->ld->wallet->bip32_base, withdraw->wtx.change_key_index,
+			BIP32_FLAG_KEY_PUBLIC, &ext) != WALLY_OK) {
+		return command_fail(cmd, LIGHTNINGD, "Keys generation failure");
+	}
+
+	if (!secp256k1_ec_pubkey_parse(secp256k1_ctx, &pubkey.pubkey,
+			ext.pub_key, sizeof(ext.pub_key))) {
+		return command_fail(cmd, LIGHTNINGD, "Key parsing failure");
+	}
+
+	txfilter_add_derkey(cmd->ld->owned_txfilter, ext.pub_key);
+
 	u8 *msg = towire_hsm_sign_withdrawal(cmd,
 					     withdraw->wtx.amount,
 					     withdraw->wtx.change,