tx: Add chainparams to struct bitcoin_tx as context

The way we build transactions, serialize them, and compute fees depends on the
chain we are working on, so let's add some context to the transactions.

Signed-off-by: Christian Decker <decker.christian@gmail.com>

bitcoin/tx.c

@@ -276,10 +276,12 @@ static void bitcoin_tx_destroy(struct bitcoin_tx *tx)
 	wally_tx_free(tx->wtx);
 }
 
-struct bitcoin_tx *bitcoin_tx(const tal_t *ctx, varint_t input_count,
-			      varint_t output_count)
+struct bitcoin_tx *bitcoin_tx(const tal_t *ctx,
+			      const struct chainparams *chainparams,
+			      varint_t input_count, varint_t output_count)
 {
 	struct bitcoin_tx *tx = tal(ctx, struct bitcoin_tx);
+
 	wally_tx_init_alloc(WALLY_TX_VERSION_2, 0, input_count, output_count,
 			    &tx->wtx);
 	tal_add_destructor(tx, bitcoin_tx_destroy);
@@ -287,6 +289,7 @@ struct bitcoin_tx *bitcoin_tx(const tal_t *ctx, varint_t input_count,
 	tx->input_amounts = tal_arrz(tx, struct amount_sat*, input_count);
 	tx->wtx->locktime = 0;
 	tx->wtx->version = 2;
+	tx->chainparams = chainparams;
 	return tx;
 }
 
@@ -305,6 +308,7 @@ struct bitcoin_tx *pull_bitcoin_tx(const tal_t *ctx, const u8 **cursor,
 	/* We don't know the input amounts yet, so set them all to NULL */
 	tx->input_amounts =
 	    tal_arrz(tx, struct amount_sat *, tx->wtx->inputs_allocation_len);
+	tx->chainparams = NULL;
 
 	*cursor += wsize;
 	*max -= wsize;

bitcoin/tx.h

@@ -23,6 +23,9 @@ struct bitcoin_tx {
 	 * unknown) */
 	struct amount_sat **input_amounts;
 	struct wally_tx *wtx;
+
+	/* Keep a reference to the ruleset we have to abide by */
+	const struct chainparams *chainparams;
 };
 
 struct bitcoin_tx_output {
@@ -52,8 +55,9 @@ size_t measure_tx_weight(const struct bitcoin_tx *tx);
 
 /* Allocate a tx: you just need to fill in inputs and outputs (they're
  * zeroed with inputs' sequence_number set to FFFFFFFF) */
-struct bitcoin_tx *bitcoin_tx(const tal_t *ctx, varint_t input_count,
-			      varint_t output_count);
+struct bitcoin_tx *bitcoin_tx(const tal_t *ctx,
+			      const struct chainparams *chainparams,
+			      varint_t input_count, varint_t output_count);
 
 /* This takes a raw bitcoin tx in hex. */
 struct bitcoin_tx *bitcoin_tx_from_hex(const tal_t *ctx, const char *hex,

channeld/channeld.c

@@ -979,10 +979,9 @@ static secp256k1_ecdsa_signature *calc_commitsigs(const tal_t *ctx,
 	const u8 *msg;
 	secp256k1_ecdsa_signature *htlc_sigs;
 
-	txs = channel_txs(tmpctx, &htlc_map, &wscripts, peer->channel,
-			  &peer->remote_per_commit,
-			  commit_index,
-			  REMOTE);
+	txs = channel_txs(tmpctx, peer->channel->chainparams, &htlc_map,
+			  &wscripts, peer->channel, &peer->remote_per_commit,
+			  commit_index, REMOTE);
 
 	msg = towire_hsm_sign_remote_commitment_tx(NULL, txs[0],
 						   &peer->channel->funding_pubkey[REMOTE],
@@ -1398,9 +1397,10 @@ static void handle_peer_commit_sig(struct peer *peer, const u8 *msg)
 	/* SIGHASH_ALL is implied. */
 	commit_sig.sighash_type = SIGHASH_ALL;
 
-	txs = channel_txs(tmpctx, &htlc_map, &wscripts, peer->channel,
-			  &peer->next_local_per_commit,
-			  peer->next_index[LOCAL], LOCAL);
+	txs =
+	    channel_txs(tmpctx, peer->channel->chainparams, &htlc_map,
+			&wscripts, peer->channel, &peer->next_local_per_commit,
+			peer->next_index[LOCAL], LOCAL);
 
 	if (!derive_simple_key(&peer->channel->basepoints[REMOTE].htlc,
 			       &peer->next_local_per_commit, &remote_htlckey))

channeld/commit_tx.c

@@ -76,6 +76,7 @@ static void add_received_htlc_out(struct bitcoin_tx *tx, size_t n,
 }
 
 struct bitcoin_tx *commit_tx(const tal_t *ctx,
+			     const struct chainparams *chainparams,
 			     const struct bitcoin_txid *funding_txid,
 			     unsigned int funding_txout,
 			     struct amount_sat funding,
@@ -146,7 +147,7 @@ struct bitcoin_tx *commit_tx(const tal_t *ctx,
 #endif
 
 	/* Worst-case sizing: both to-local and to-remote outputs. */
-	tx = bitcoin_tx(ctx, 1, untrimmed + 2);
+	tx = bitcoin_tx(ctx, chainparams, 1, untrimmed + 2);
 
 	/* We keep track of which outputs have which HTLCs */
 	*htlcmap = tal_arr(tx, const struct htlc *, tx->wtx->outputs_allocation_len);

channeld/commit_tx.h

@@ -1,6 +1,7 @@
 #ifndef LIGHTNING_CHANNELD_COMMIT_TX_H
 #define LIGHTNING_CHANNELD_COMMIT_TX_H
 #include "config.h"
+#include <bitcoin/chainparams.h>
 #include <bitcoin/pubkey.h>
 #include <channeld/channeld_htlc.h>
 #include <common/htlc.h>
@@ -43,6 +44,7 @@ size_t commit_tx_num_untrimmed(const struct htlc **htlcs,
  * transaction, so we carefully use the terms "self" and "other" here.
  */
 struct bitcoin_tx *commit_tx(const tal_t *ctx,
+			     const struct chainparams *chainparams,
 			     const struct bitcoin_txid *funding_txid,
 			     unsigned int funding_txout,
 			     struct amount_sat funding,

channeld/full_channel.c

@@ -187,7 +187,8 @@ static bool sum_offered_msatoshis(struct amount_msat *total,
 	return true;
 }
 
-static void add_htlcs(struct bitcoin_tx ***txs,
+static void add_htlcs(const struct chainparams *chainparams,
+		      struct bitcoin_tx ***txs,
 		      const u8 ***wscripts,
 		      const struct htlc **htlcmap,
 		      const struct channel *channel,
@@ -210,7 +211,7 @@ static void add_htlcs(struct bitcoin_tx ***txs,
 			continue;
 
 		if (htlc_owner(htlc) == side) {
-			tx = htlc_timeout_tx(*txs, &txid, i,
+			tx = htlc_timeout_tx(*txs, chainparams, &txid, i,
 					     htlc->amount,
 					     htlc->expiry.locktime,
 					     channel->config[!side].to_self_delay,
@@ -222,7 +223,7 @@ static void add_htlcs(struct bitcoin_tx ***txs,
 						     &htlc->rhash,
 						     &keyset->self_revocation_key);
 		} else {
-			tx = htlc_success_tx(*txs, &txid, i,
+			tx = htlc_success_tx(*txs, chainparams, &txid, i,
 					     htlc->amount,
 					     channel->config[!side].to_self_delay,
 					     feerate_per_kw,
@@ -245,6 +246,7 @@ static void add_htlcs(struct bitcoin_tx ***txs,
 
 /* FIXME: We could cache these. */
 struct bitcoin_tx **channel_txs(const tal_t *ctx,
+				const struct chainparams *chainparams,
 				const struct htlc ***htlcmap,
 				const u8 ***wscripts,
 				const struct channel *channel,
@@ -266,27 +268,21 @@ struct bitcoin_tx **channel_txs(const tal_t *ctx,
 	gather_htlcs(ctx, channel, side, &committed, NULL, NULL);
 
 	txs = tal_arr(ctx, struct bitcoin_tx *, 1);
-	txs[0] = commit_tx(ctx, &channel->funding_txid,
-		       channel->funding_txout,
-		       channel->funding,
-		       channel->funder,
-		       channel->config[!side].to_self_delay,
-		       &keyset,
-		       channel->view[side].feerate_per_kw,
-		       channel->config[side].dust_limit,
-		       channel->view[side].owed[side],
-		       channel->view[side].owed[!side],
-		       committed,
-		       htlcmap,
-		       commitment_number ^ channel->commitment_number_obscurer,
-		       side);
+	txs[0] = commit_tx(
+	    ctx, chainparams, &channel->funding_txid, channel->funding_txout,
+	    channel->funding, channel->funder,
+	    channel->config[!side].to_self_delay, &keyset,
+	    channel->view[side].feerate_per_kw,
+	    channel->config[side].dust_limit, channel->view[side].owed[side],
+	    channel->view[side].owed[!side], committed, htlcmap,
+	    commitment_number ^ channel->commitment_number_obscurer, side);
 
 	*wscripts = tal_arr(ctx, const u8 *, 1);
 	(*wscripts)[0] = bitcoin_redeem_2of2(*wscripts,
 					     &channel->funding_pubkey[side],
 					     &channel->funding_pubkey[!side]);
 
-	add_htlcs(&txs, wscripts, *htlcmap, channel, &keyset, side);
+	add_htlcs(chainparams, &txs, wscripts, *htlcmap, channel, &keyset, side);
 
 	tal_free(committed);
 	return txs;

channeld/full_channel.h

@@ -47,6 +47,7 @@ struct channel *new_full_channel(const tal_t *ctx,
 /**
  * channel_txs: Get the current commitment and htlc txs for the channel.
  * @ctx: tal context to allocate return value from.
+ * @chainparams: Parameters for the generated transactions.
  * @channel: The channel to evaluate
  * @htlc_map: Pointer to htlcs for each tx output (allocated off @ctx).
  * @wscripts: Pointer to array of wscript for each tx returned (alloced off @ctx)
@@ -59,6 +60,7 @@ struct channel *new_full_channel(const tal_t *ctx,
  * fills in @htlc_map, or NULL on key derivation failure.
  */
 struct bitcoin_tx **channel_txs(const tal_t *ctx,
+				const struct chainparams *chainparams,
 				const struct htlc ***htlcmap,
 				const u8 ***wscripts,
 				const struct channel *channel,

channeld/test/run-commit_tx.c

@@ -222,7 +222,8 @@ static void report_htlcs(const struct bitcoin_tx *tx,
 			continue;
 
 		if (htlc_owner(htlc) == LOCAL) {
-			htlc_tx[i] = htlc_timeout_tx(htlc_tx, &txid, i,
+			htlc_tx[i] = htlc_timeout_tx(htlc_tx, tx->chainparams,
+						     &txid, i,
 						     htlc->amount,
 						     htlc->expiry.locktime,
 						     to_self_delay,
@@ -234,7 +235,8 @@ static void report_htlcs(const struct bitcoin_tx *tx,
 								&htlc->rhash,
 								remote_revocation_key);
 		} else {
-			htlc_tx[i] = htlc_success_tx(htlc_tx, &txid, i,
+			htlc_tx[i] = htlc_success_tx(htlc_tx, tx->chainparams,
+						     &txid, i,
 						     htlc->amount,
 						     to_self_delay,
 						     feerate_per_kw,
@@ -457,6 +459,7 @@ int main(void)
 	u64 commitment_number, cn_obscurer;
 	struct amount_msat to_local, to_remote;
 	const struct htlc **htlcs, **htlc_map, **htlc_map2, **inv_htlcs;
+	const struct chainparams *chainparams = chainparams_for_network("bitcoin");
 
 	secp256k1_ctx = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY
 						 | SECP256K1_CONTEXT_SIGN);
@@ -712,7 +715,8 @@ int main(void)
 	keyset.other_htlc_key = remote_htlckey;
 
 	print_superverbose = true;
-	tx = commit_tx(tmpctx, &funding_txid, funding_output_index,
+	tx = commit_tx(tmpctx, chainparams,
+		       &funding_txid, funding_output_index,
 		       funding_amount,
 		       LOCAL, to_self_delay,
 		       &keyset,
@@ -723,7 +727,8 @@ int main(void)
 		       NULL, &htlc_map, commitment_number ^ cn_obscurer,
 		       LOCAL);
 	print_superverbose = false;
-	tx2 = commit_tx(tmpctx, &funding_txid, funding_output_index,
+	tx2 = commit_tx(tmpctx, chainparams,
+			&funding_txid, funding_output_index,
 			funding_amount,
 			REMOTE, to_self_delay,
 			&keyset,
@@ -766,7 +771,8 @@ int main(void)
 	       to_local.millisatoshis, to_remote.millisatoshis, feerate_per_kw);
 
 	print_superverbose = true;
-	tx = commit_tx(tmpctx, &funding_txid, funding_output_index,
+	tx = commit_tx(tmpctx, chainparams,
+		       &funding_txid, funding_output_index,
 		       funding_amount,
 		       LOCAL, to_self_delay,
 		       &keyset,
@@ -777,7 +783,8 @@ int main(void)
 		       htlcs, &htlc_map, commitment_number ^ cn_obscurer,
 		       LOCAL);
 	print_superverbose = false;
-	tx2 = commit_tx(tmpctx, &funding_txid, funding_output_index,
+	tx2 = commit_tx(tmpctx, chainparams,
+			&funding_txid, funding_output_index,
 			funding_amount,
 			REMOTE, to_self_delay,
 			&keyset,
@@ -808,7 +815,8 @@ int main(void)
 
 		feerate_per_kw = increase(feerate_per_kw);
 		print_superverbose = false;
-		newtx = commit_tx(tmpctx, &funding_txid, funding_output_index,
+		newtx = commit_tx(tmpctx, chainparams,
+				  &funding_txid, funding_output_index,
 				  funding_amount,
 				  LOCAL, to_self_delay,
 				  &keyset,
@@ -820,7 +828,8 @@ int main(void)
 				  commitment_number ^ cn_obscurer,
 				  LOCAL);
 		/* This is what it would look like for peer generating it! */
-		tx2 = commit_tx(tmpctx, &funding_txid, funding_output_index,
+		tx2 = commit_tx(tmpctx, chainparams,
+				&funding_txid, funding_output_index,
 				funding_amount,
 				REMOTE, to_self_delay,
 				&keyset,
@@ -851,7 +860,8 @@ int main(void)
 		       to_local.millisatoshis, to_remote.millisatoshis, feerate_per_kw-1);
 		/* Recalc with verbosity on */
 		print_superverbose = true;
-		tx = commit_tx(tmpctx, &funding_txid, funding_output_index,
+		tx = commit_tx(tmpctx, chainparams,
+			       &funding_txid, funding_output_index,
 			       funding_amount,
 			       LOCAL, to_self_delay,
 			       &keyset,
@@ -887,7 +897,8 @@ int main(void)
 		       to_local.millisatoshis, to_remote.millisatoshis, feerate_per_kw);
 		/* Recalc with verbosity on */
 		print_superverbose = true;
-		newtx = commit_tx(tmpctx, &funding_txid, funding_output_index,
+		newtx = commit_tx(tmpctx, chainparams,
+				  &funding_txid, funding_output_index,
 				  funding_amount,
 				  LOCAL, to_self_delay,
 				  &keyset,
@@ -945,7 +956,8 @@ int main(void)
 		       "to_remote_msat: %"PRIu64"\n"
 		       "local_feerate_per_kw: %u\n",
 		       to_local.millisatoshis, to_remote.millisatoshis, feerate_per_kw);
-		tx = commit_tx(tmpctx, &funding_txid, funding_output_index,
+		tx = commit_tx(tmpctx, chainparams,
+			       &funding_txid, funding_output_index,
 			       funding_amount,
 			       LOCAL, to_self_delay,
 			       &keyset,

channeld/test/run-full_channel.c

@@ -494,7 +494,8 @@ int main(void)
 	keyset.self_htlc_key = keyset.self_payment_key;
 	keyset.other_htlc_key = keyset.other_payment_key;
 
-	raw_tx = commit_tx(tmpctx, &funding_txid, funding_output_index,
+	raw_tx = commit_tx(tmpctx, chainparams,
+			   &funding_txid, funding_output_index,
 			   funding_amount,
 			   LOCAL, remote_config->to_self_delay,
 			   &keyset,
@@ -504,7 +505,8 @@ int main(void)
 			   to_remote,
 			   NULL, &htlc_map, 0x2bb038521914 ^ 42, LOCAL);
 
-	txs = channel_txs(tmpctx, &htlc_map, &wscripts,
+	txs = channel_txs(tmpctx, chainparams,
+			  &htlc_map, &wscripts,
 			  lchannel, &local_per_commitment_point, 42, LOCAL);
 	assert(tal_count(txs) == 1);
 	assert(tal_count(htlc_map) == 2);
@@ -512,7 +514,8 @@ int main(void)
 	assert(scripteq(wscripts[0], funding_wscript));
 	tx_must_be_eq(txs[0], raw_tx);
 
-	txs2 = channel_txs(tmpctx, &htlc_map, &wscripts,
+	txs2 = channel_txs(tmpctx, chainparams,
+			   &htlc_map, &wscripts,
 			   rchannel, &local_per_commitment_point, 42, REMOTE);
 	txs_must_be_eq(txs, txs2);
 
@@ -539,10 +542,10 @@ int main(void)
 	assert(lchannel->view[REMOTE].owed[REMOTE].millisatoshis
 	       == rchannel->view[LOCAL].owed[LOCAL].millisatoshis);
 
-	txs = channel_txs(tmpctx, &htlc_map, &wscripts,
+	txs = channel_txs(tmpctx, chainparams,&htlc_map, &wscripts,
 			  lchannel, &local_per_commitment_point, 42, LOCAL);
 	assert(tal_count(txs) == 1);
-	txs2 = channel_txs(tmpctx, &htlc_map, &wscripts,
+	txs2 = channel_txs(tmpctx, chainparams, &htlc_map, &wscripts,
 			   rchannel, &local_per_commitment_point, 42, REMOTE);
 	txs_must_be_eq(txs, txs2);
 
@@ -557,10 +560,10 @@ int main(void)
 	assert(lchannel->view[REMOTE].owed[REMOTE].millisatoshis
 	       == rchannel->view[LOCAL].owed[LOCAL].millisatoshis);
 
-	txs = channel_txs(tmpctx, &htlc_map, &wscripts,
+	txs = channel_txs(tmpctx, chainparams, &htlc_map, &wscripts,
 			  lchannel, &local_per_commitment_point, 42, LOCAL);
 	assert(tal_count(txs) == 6);
-	txs2 = channel_txs(tmpctx, &htlc_map, &wscripts,
+	txs2 = channel_txs(tmpctx, chainparams, &htlc_map, &wscripts,
 			   rchannel, &local_per_commitment_point, 42, REMOTE);
 	txs_must_be_eq(txs, txs2);
 
@@ -570,6 +573,7 @@ int main(void)
 	 *     output htlc_success_tx 0: 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
 	 */
 	raw_tx = tx_from_hex(tmpctx, "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");
+	raw_tx->chainparams = chainparams_for_network("bitcoin");
 	bitcoin_tx_input_set_witness(raw_tx, 0, NULL);
 	tx_must_be_eq(raw_tx, txs[1]);
 
@@ -578,6 +582,7 @@ int main(void)
 	 *     output htlc_timeout_tx 2: 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
 	 */
 	raw_tx = tx_from_hex(tmpctx, "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");
+	raw_tx->chainparams = chainparams_for_network("bitcoin");
 	bitcoin_tx_input_set_witness(raw_tx, 0, NULL);
 	tx_must_be_eq(raw_tx, txs[2]);
 
@@ -586,6 +591,7 @@ int main(void)
 	 *     output htlc_success_tx 1: 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
 	 */
 	raw_tx = tx_from_hex(tmpctx, "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");
+	raw_tx->chainparams = chainparams_for_network("bitcoin");
 	bitcoin_tx_input_set_witness(raw_tx, 0, NULL);
 	tx_must_be_eq(raw_tx, txs[3]);
 
@@ -594,6 +600,7 @@ int main(void)
 	 *     output htlc_timeout_tx 3: 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
 	 */
 	raw_tx = tx_from_hex(tmpctx, "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");
+	raw_tx->chainparams = chainparams_for_network("bitcoin");
 	bitcoin_tx_input_set_witness(raw_tx, 0, NULL);
 	tx_must_be_eq(raw_tx, txs[4]);
 
@@ -602,6 +609,7 @@ int main(void)
 	 *     output htlc_success_tx 4: 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
 	 */
 	raw_tx = tx_from_hex(tmpctx, "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");
+	raw_tx->chainparams = chainparams_for_network("bitcoin");
 	bitcoin_tx_input_set_witness(raw_tx, 0, NULL);
 	tx_must_be_eq(raw_tx, txs[5]);
 
@@ -612,23 +620,19 @@ int main(void)
 		lchannel->view[LOCAL].feerate_per_kw = feerate_per_kw[LOCAL];
 		rchannel->view[REMOTE].feerate_per_kw = feerate_per_kw[REMOTE];
 
-		raw_tx = commit_tx(tmpctx, &funding_txid, funding_output_index,
-				   funding_amount,
-				   LOCAL, remote_config->to_self_delay,
-				   &keyset,
-				   feerate_per_kw[LOCAL],
-				   local_config->dust_limit,
-				   to_local,
-				   to_remote,
-				   htlcs, &htlc_map,
-				   0x2bb038521914 ^ 42, LOCAL);
-
-		txs = channel_txs(tmpctx, &htlc_map, &wscripts,
-				  lchannel, &local_per_commitment_point,
-				  42, LOCAL);
+		raw_tx = commit_tx(
+		    tmpctx, chainparams, &funding_txid, funding_output_index,
+		    funding_amount, LOCAL, remote_config->to_self_delay,
+		    &keyset, feerate_per_kw[LOCAL], local_config->dust_limit,
+		    to_local, to_remote, htlcs, &htlc_map, 0x2bb038521914 ^ 42,
+		    LOCAL);
+
+		txs = channel_txs(tmpctx, chainparams, &htlc_map, &wscripts,
+				  lchannel, &local_per_commitment_point, 42,
+				  LOCAL);
 		tx_must_be_eq(txs[0], raw_tx);
 
-		txs2 = channel_txs(tmpctx,  &htlc_map, &wscripts,
+		txs2 = channel_txs(tmpctx,  chainparams, &htlc_map, &wscripts,
 				   rchannel, &local_per_commitment_point,
 				   42, REMOTE);
 		txs_must_be_eq(txs, txs2);

closingd/closingd.c

@@ -31,6 +31,7 @@
 #define HSM_FD 6
 
 static struct bitcoin_tx *close_tx(const tal_t *ctx,
+				   const struct chainparams *chainparams,
 				   struct per_peer_state *pps,
 				   const struct channel_id *channel_id,
 				   u8 *scriptpubkey[NUM_SIDES],
@@ -63,6 +64,7 @@ static struct bitcoin_tx *close_tx(const tal_t *ctx,
 
 	/* FIXME: We need to allow this! */
 	tx = create_close_tx(ctx,
+			     chainparams,
 			     scriptpubkey[LOCAL], scriptpubkey[REMOTE],
 			     funding_txid,
 			     funding_txout,
@@ -210,6 +212,7 @@ static void do_reconnect(struct per_peer_state *pps,
 }
 
 static void send_offer(struct per_peer_state *pps,
+		       const struct chainparams *chainparams,
 		       const struct channel_id *channel_id,
 		       const struct pubkey funding_pubkey[NUM_SIDES],
 		       u8 *scriptpubkey[NUM_SIDES],
@@ -231,7 +234,7 @@ static void send_offer(struct per_peer_state *pps,
 	 *     transaction, as specified in [BOLT
 	 *     #3](03-transactions.md#closing-transaction).
 	 */
-	tx = close_tx(tmpctx, pps, channel_id,
+	tx = close_tx(tmpctx, chainparams, pps, channel_id,
 		      scriptpubkey,
 		      funding_txid,
 		      funding_txout,
@@ -286,6 +289,7 @@ static void tell_master_their_offer(const struct bitcoin_signature *their_sig,
 /* Returns fee they offered. */
 static struct amount_sat
 receive_offer(struct per_peer_state *pps,
+	      const struct chainparams *chainparams,
 	      const struct channel_id *channel_id,
 	      const struct pubkey funding_pubkey[NUM_SIDES],
 	      const u8 *funding_wscript,
@@ -340,7 +344,7 @@ receive_offer(struct per_peer_state *pps,
 	 *   specified in [BOLT #3](03-transactions.md#closing-transaction):
 	 *     - MUST fail the connection.
 	 */
-	tx = close_tx(tmpctx, pps, channel_id,
+	tx = close_tx(tmpctx, chainparams, pps, channel_id,
 		      scriptpubkey,
 		      funding_txid,
 		      funding_txout,
@@ -369,7 +373,7 @@ receive_offer(struct per_peer_state *pps,
 		 *    `dust_limit_satoshis`.
 		 *   - MAY eliminate its own output.
 		 */
-		trimmed = close_tx(tmpctx, pps, channel_id,
+		trimmed = close_tx(tmpctx, chainparams, pps, channel_id,
 				   scriptpubkey,
 				   funding_txid,
 				   funding_txout,
@@ -551,6 +555,7 @@ int main(int argc, char *argv[])
 	u8 *channel_reestablish;
 	struct secret last_remote_per_commit_secret;
 	struct bitcoin_blkid chain_hash;
+	const struct chainparams *chainparams;
 
 	subdaemon_setup(argc, argv);
 
@@ -583,6 +588,7 @@ int main(int argc, char *argv[])
 
 	/* stdin == requests, 3 == peer, 4 = gossip, 5 = gossip_store, 6 = hsmd */
 	per_peer_state_set_fds(pps, 3, 4, 5);
+	chainparams = chainparams_by_chainhash(&chain_hash);
 
 	status_trace("out = %s/%s",
 		     type_to_string(tmpctx, struct amount_sat, &out[LOCAL]),
@@ -624,7 +630,7 @@ int main(int argc, char *argv[])
 	whose_turn = funder;
 	for (size_t i = 0; i < 2; i++, whose_turn = !whose_turn) {
 		if (whose_turn == LOCAL) {
-			send_offer(pps,
+			send_offer(pps, chainparams,
 				   &channel_id, funding_pubkey,
 				   scriptpubkey, &funding_txid, funding_txout,
 				   funding, out, funder,
@@ -642,7 +648,7 @@ int main(int argc, char *argv[])
 							      struct amount_sat,
 							      &offer[LOCAL]));
 			offer[REMOTE]
-				= receive_offer(pps,
+				= receive_offer(pps, chainparams,
 						&channel_id, funding_pubkey,
 						funding_wscript,
 						scriptpubkey, &funding_txid,
@@ -671,7 +677,7 @@ int main(int argc, char *argv[])
 						    &channel_id,
 						    &feerange, offer[REMOTE],
 						    min_fee_to_accept);
-			send_offer(pps, &channel_id,
+			send_offer(pps, chainparams, &channel_id,
 				   funding_pubkey,
 				   scriptpubkey, &funding_txid, funding_txout,
 				   funding, out, funder,
@@ -684,7 +690,7 @@ int main(int argc, char *argv[])
 				       " theirs was %"PRIu64" satoshi,",
 				       offer[LOCAL], offer[REMOTE]);
 			offer[REMOTE]
-				= receive_offer(pps, &channel_id,
+				= receive_offer(pps, chainparams, &channel_id,
 						funding_pubkey,
 						funding_wscript,
 						scriptpubkey, &funding_txid,

common/close_tx.c

@@ -5,6 +5,7 @@
 #include <assert.h>
 
 struct bitcoin_tx *create_close_tx(const tal_t *ctx,
+				   const struct chainparams *chainparams,
 				   const u8 *our_script,
 				   const u8 *their_script,
 				   const struct bitcoin_txid *anchor_txid,
@@ -33,7 +34,7 @@ struct bitcoin_tx *create_close_tx(const tal_t *ctx,
 	 * * txin count: 1
 	 */
 	/* Now create close tx: one input, two outputs. */
-	tx = bitcoin_tx(ctx, 1, 2);
+	tx = bitcoin_tx(ctx, chainparams, 1, 2);
 
 	/* Our input spends the anchor tx output. */
 	bitcoin_tx_add_input(tx, anchor_txid, anchor_index,

common/close_tx.h

@@ -1,6 +1,8 @@
 #ifndef LIGHTNING_COMMON_CLOSE_TX_H
 #define LIGHTNING_COMMON_CLOSE_TX_H
 #include "config.h"
+#include <bitcoin/chainparams.h>
+#include <bitcoin/tx.h>
 #include <ccan/short_types/short_types.h>
 #include <ccan/tal/tal.h>
 #include <common/amount.h>
@@ -10,6 +12,7 @@ struct pubkey;
 /* Create close tx to spend the anchor tx output; doesn't fill in
  * input scriptsig. */
 struct bitcoin_tx *create_close_tx(const tal_t *ctx,
+				   const struct chainparams *chainparams,
 				   const u8 *our_script,
 				   const u8 *their_script,
 				   const struct bitcoin_txid *anchor_txid,

common/funding_tx.c

@@ -12,6 +12,7 @@
 #endif
 
 struct bitcoin_tx *funding_tx(const tal_t *ctx,
+			      const struct chainparams *chainparams,
 			      u16 *outnum,
 			      const struct utxo **utxomap,
 			      struct amount_sat funding,
@@ -25,7 +26,7 @@ struct bitcoin_tx *funding_tx(const tal_t *ctx,
 	struct bitcoin_tx *tx;
 	bool has_change = !amount_sat_eq(change, AMOUNT_SAT(0));
 
-	tx = tx_spending_utxos(ctx, utxomap, bip32_base, has_change);
+	tx = tx_spending_utxos(ctx, chainparams, utxomap, bip32_base, has_change);
 
 
 	wscript = bitcoin_redeem_2of2(tx, local_fundingkey, remote_fundingkey);

common/funding_tx.h

@@ -1,6 +1,7 @@
 #ifndef LIGHTNING_COMMON_FUNDING_TX_H
 #define LIGHTNING_COMMON_FUNDING_TX_H
 #include "config.h"
+#include <bitcoin/chainparams.h>
 #include <ccan/short_types/short_types.h>
 #include <ccan/tal/tal.h>
 #include <common/amount.h>
@@ -14,6 +15,7 @@ struct utxo;
 /**
  * funding_tx: create a P2WSH funding transaction for a channel.
  * @ctx: context to tal from.
+ * @chainparams: (in) the params for the resulting transaction.
  * @outnum: (out) txout (0 or 1) which is the funding output.
  * @utxomap: (in/out) tal_arr of UTXO pointers to spend (permuted to match)
  * @funding: (in) satoshis to output.
@@ -33,6 +35,7 @@ struct utxo;
  * a special case because of the P2SH inputs.
  */
 struct bitcoin_tx *funding_tx(const tal_t *ctx,
+			      const struct chainparams *chainparams,
 			      u16 *outnum,
 			      const struct utxo **utxomap,
 			      struct amount_sat funding,

common/htlc_tx.c

@@ -5,6 +5,7 @@
 #include <common/keyset.h>
 
 static struct bitcoin_tx *htlc_tx(const tal_t *ctx,
+				  const struct chainparams *chainparams,
 				  const struct bitcoin_txid *commit_txid,
 				  unsigned int commit_output_number,
 				  struct amount_msat msat,
@@ -14,7 +15,7 @@ static struct bitcoin_tx *htlc_tx(const tal_t *ctx,
 				  struct amount_sat htlc_fee,
 				  u32 locktime)
 {
-	struct bitcoin_tx *tx = bitcoin_tx(ctx, 1, 1);
+	struct bitcoin_tx *tx = bitcoin_tx(ctx, chainparams, 1, 1);
 	u8 *wscript;
 	struct amount_sat amount;
 
@@ -68,6 +69,7 @@ static struct bitcoin_tx *htlc_tx(const tal_t *ctx,
 }
 
 struct bitcoin_tx *htlc_success_tx(const tal_t *ctx,
+				   const struct chainparams *chainparams,
 				   const struct bitcoin_txid *commit_txid,
 				   unsigned int commit_output_number,
 				   struct amount_msat htlc_msatoshi,
@@ -78,7 +80,7 @@ struct bitcoin_tx *htlc_success_tx(const tal_t *ctx,
 	/* BOLT #3:
 	 * * locktime: `0` for HTLC-success, `cltv_expiry` for HTLC-timeout
 	 */
-	return htlc_tx(ctx, commit_txid, commit_output_number, htlc_msatoshi,
+	return htlc_tx(ctx, chainparams, commit_txid, commit_output_number, htlc_msatoshi,
 		       to_self_delay,
 		       &keyset->self_revocation_key,
 		       &keyset->self_delayed_payment_key,
@@ -112,6 +114,7 @@ void htlc_success_tx_add_witness(struct bitcoin_tx *htlc_success,
 }
 
 struct bitcoin_tx *htlc_timeout_tx(const tal_t *ctx,
+				   const struct chainparams *chainparams,
 				   const struct bitcoin_txid *commit_txid,
 				   unsigned int commit_output_number,
 				   struct amount_msat htlc_msatoshi,
@@ -123,12 +126,11 @@ struct bitcoin_tx *htlc_timeout_tx(const tal_t *ctx,
 	/* BOLT #3:
 	 * * locktime: `0` for HTLC-success, `cltv_expiry` for HTLC-timeout
 	 */
-	return htlc_tx(ctx, commit_txid, commit_output_number, htlc_msatoshi,
-		       to_self_delay,
+	return htlc_tx(ctx, chainparams, commit_txid, commit_output_number,
+		       htlc_msatoshi, to_self_delay,
 		       &keyset->self_revocation_key,
 		       &keyset->self_delayed_payment_key,
-		       htlc_timeout_fee(feerate_per_kw),
-		       cltv_expiry);
+		       htlc_timeout_fee(feerate_per_kw), cltv_expiry);
 }
 
 /* Fill in the witness for HTLC-timeout tx produced above. */

common/htlc_tx.h

@@ -1,6 +1,7 @@
 #ifndef LIGHTNING_COMMON_HTLC_TX_H
 #define LIGHTNING_COMMON_HTLC_TX_H
 #include "config.h"
+#include <bitcoin/chainparams.h>
 #include <common/amount.h>
 #include <common/htlc.h>
 
@@ -38,6 +39,7 @@ static inline struct amount_sat htlc_success_fee(u32 feerate_per_kw)
 /* Create HTLC-success tx to spend a received HTLC commitment tx
  * output; doesn't fill in input witness. */
 struct bitcoin_tx *htlc_success_tx(const tal_t *ctx,
+				   const struct chainparams *chainparams,
 				   const struct bitcoin_txid *commit_txid,
 				   unsigned int commit_output_number,
 				   struct amount_msat htlc_msatoshi,
@@ -58,6 +60,7 @@ void htlc_success_tx_add_witness(struct bitcoin_tx *htlc_success,
 /* Create HTLC-timeout tx to spend an offered HTLC commitment tx
  * output; doesn't fill in input witness. */
 struct bitcoin_tx *htlc_timeout_tx(const tal_t *ctx,
+				   const struct chainparams *chainparams,
 				   const struct bitcoin_txid *commit_txid,
 				   unsigned int commit_output_number,
 				   struct amount_msat htlc_msatoshi,

common/initial_channel.c

@@ -93,7 +93,8 @@ struct bitcoin_tx *initial_channel_tx(const tal_t *ctx,
 				       &channel->funding_pubkey[side],
 				       &channel->funding_pubkey[!side]);
 
-	return initial_commit_tx(ctx, &channel->funding_txid,
+	return initial_commit_tx(ctx, channel->chainparams,
+				 &channel->funding_txid,
 				 channel->funding_txout,
 				 channel->funding,
 				 channel->funder,

common/initial_commit_tx.c

@@ -60,6 +60,7 @@ u8 *to_self_wscript(const tal_t *ctx,
 }
 
 struct bitcoin_tx *initial_commit_tx(const tal_t *ctx,
+				     const struct chainparams *chainparams,
 				     const struct bitcoin_txid *funding_txid,
 				     unsigned int funding_txout,
 				     struct amount_sat funding,
@@ -146,7 +147,7 @@ struct bitcoin_tx *initial_commit_tx(const tal_t *ctx,
 
 
 	/* Worst-case sizing: both to-local and to-remote outputs. */
-	tx = bitcoin_tx(ctx, 1, untrimmed + 2);
+	tx = bitcoin_tx(ctx, chainparams, 1, untrimmed + 2);
 
 	/* This could be done in a single loop, but we follow the BOLT
 	 * literally to make comments in test vectors clearer. */

common/initial_commit_tx.h

@@ -2,6 +2,7 @@
 #ifndef LIGHTNING_COMMON_INITIAL_COMMIT_TX_H
 #define LIGHTNING_COMMON_INITIAL_COMMIT_TX_H
 #include "config.h"
+#include <bitcoin/chainparams.h>
 #include <bitcoin/pubkey.h>
 #include <common/amount.h>
 #include <common/htlc.h>
@@ -52,6 +53,7 @@ static inline struct amount_sat commit_tx_base_fee(u32 feerate_per_kw,
 /**
  * initial_commit_tx: create (unsigned) commitment tx to spend the funding tx output
  * @ctx: context to allocate transaction and @htlc_map from.
+ * @chainparams: Params for the resulting transactions
  * @funding_txid, @funding_out, @funding: funding outpoint.
  * @funder: is the LOCAL or REMOTE paying the fee?
  * @keyset: keys derived for this commit tx.
@@ -69,6 +71,7 @@ static inline struct amount_sat commit_tx_base_fee(u32 feerate_per_kw,
  * transaction, so we carefully use the terms "self" and "other" here.
  */
 struct bitcoin_tx *initial_commit_tx(const tal_t *ctx,
+				     const struct chainparams *chainparams,
 				     const struct bitcoin_txid *funding_txid,
 				     unsigned int funding_txout,
 				     struct amount_sat funding,

common/test/run-funding_tx.c

@@ -110,6 +110,7 @@ int main(void)
 	struct bitcoin_signature sig;
 	struct bitcoin_address addr;
 	struct amount_sat tmpamt;
+	const struct chainparams *chainparams = chainparams_for_network("bitcoin");
 
 	secp256k1_ctx = secp256k1_context_create(SECP256K1_CONTEXT_VERIFY
 						 | SECP256K1_CONTEXT_SIGN);
@@ -122,6 +123,7 @@ int main(void)
 	input = bitcoin_tx_from_hex(tmpctx,
 				    "01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff03510101ffffffff0100f2052a010000001976a9143ca33c2e4446f4a305f23c80df8ad1afdcf652f988ac00000000",
 				    strlen("01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff03510101ffffffff0100f2052a010000001976a9143ca33c2e4446f4a305f23c80df8ad1afdcf652f988ac00000000"));
+	input->chainparams = chainparams_for_network("bitcoin");
 	assert(input);
 
 	/* BOLT #3:
@@ -172,7 +174,8 @@ int main(void)
 	if (!amount_sat_sub(&change, utxo.amount, funding_sat)
 	    || !amount_sat_sub(&change, change, fee))
 		abort();
-	funding = funding_tx(tmpctx, &funding_outnum, utxomap,
+	funding = funding_tx(tmpctx, chainparams,
+			     &funding_outnum, utxomap,
 			     funding_sat,
 			     &local_funding_pubkey,
 			     &remote_funding_pubkey,

common/utxo.c

@@ -49,6 +49,7 @@ struct utxo *fromwire_utxo(const tal_t *ctx, const u8 **ptr, size_t *max)
 }
 
 struct bitcoin_tx *tx_spending_utxos(const tal_t *ctx,
+				     const struct chainparams *chainparams,
 				     const struct utxo **utxos,
 				     const struct ext_key *bip32_base,
 				     bool add_change_output)
@@ -56,7 +57,7 @@ struct bitcoin_tx *tx_spending_utxos(const tal_t *ctx,
 	struct pubkey key;
 	u8 *script;
 	size_t outcount = add_change_output ? 2 : 1;
-	struct bitcoin_tx *tx = bitcoin_tx(ctx, tal_count(utxos), outcount);
+	struct bitcoin_tx *tx = bitcoin_tx(ctx, chainparams, tal_count(utxos), outcount);
 
 	for (size_t i = 0; i < tal_count(utxos); i++) {
 		if (utxos[i]->is_p2sh && bip32_base) {

common/utxo.h

@@ -1,6 +1,7 @@
 #ifndef LIGHTNING_COMMON_UTXO_H
 #define LIGHTNING_COMMON_UTXO_H
 #include "config.h"
+#include <bitcoin/chainparams.h>
 #include <bitcoin/pubkey.h>
 #include <bitcoin/shadouble.h>
 #include <bitcoin/tx.h>
@@ -46,6 +47,7 @@ struct utxo *fromwire_utxo(const tal_t *ctx, const u8 **ptr, size_t *max);
 
 /* Create a tx, and populate inputs from utxos */
 struct bitcoin_tx *tx_spending_utxos(const tal_t *ctx,
+				     const struct chainparams *chainparams,
 				     const struct utxo **utxos,
 				     const struct ext_key *bip32_base,
 				     bool add_change_output);

common/withdraw_tx.c

@@ -9,6 +9,7 @@
 #include <wally_bip32.h>
 
 struct bitcoin_tx *withdraw_tx(const tal_t *ctx,
+			       const struct chainparams *chainparams,
 			       const struct utxo **utxos,
 			       const u8 *destination,
 			       struct amount_sat withdraw_amount,
@@ -19,7 +20,7 @@ struct bitcoin_tx *withdraw_tx(const tal_t *ctx,
 {
 	struct bitcoin_tx *tx;
 
-	tx = tx_spending_utxos(ctx, utxos, bip32_base,
+	tx = tx_spending_utxos(ctx, chainparams, utxos, bip32_base,
 			       !amount_sat_eq(change, AMOUNT_SAT(0)));
 
 	bitcoin_tx_add_output(tx, destination, &withdraw_amount);

common/withdraw_tx.h

@@ -1,6 +1,7 @@
 #ifndef LIGHTNING_COMMON_WITHDRAW_TX_H
 #define LIGHTNING_COMMON_WITHDRAW_TX_H
 #include "config.h"
+#include <bitcoin/chainparams.h>
 #include <ccan/short_types/short_types.h>
 #include <ccan/tal/tal.h>
 #include <common/amount.h>
@@ -16,6 +17,7 @@ struct utxo;
  * withdraw_tx - Create a p2pkh withdrawal transaction
  *
  * @ctx: context to tal from.
+ * @chainparams: (in) the params for the created transaction.
  * @utxos: (in/out) tal_arr of UTXO pointers to spend (permuted to match)
  * @destination: (in) tal_arr of u8, scriptPubKey to send to.
  * @amount: (in) satoshis to send to the destination
@@ -25,6 +27,7 @@ struct utxo;
  * @change_outnum: (out) set to output index of change output or -1 if none, unless NULL.
  */
 struct bitcoin_tx *withdraw_tx(const tal_t *ctx,
+			       const struct chainparams *chainparams,
 			       const struct utxo **utxos,
 			       const u8 *destination,
 			       struct amount_sat withdraw_amount,

devtools/mkcommit.c

@@ -247,6 +247,7 @@ int main(int argc, char *argv[])
 	const struct htlc **htlcmap;
 	struct privkey local_htlc_privkey, remote_htlc_privkey;
 	struct pubkey local_htlc_pubkey, remote_htlc_pubkey;
+	const struct chainparams *chainparams = chainparams_for_network("bitcoin");
 
 	setup_locale();
 
@@ -367,7 +368,7 @@ int main(int argc, char *argv[])
 	if (!per_commit_point(&localseed, &local_per_commit_point, commitnum))
 		errx(1, "Bad deriving local per-commitment-point");
 
-	local_txs = channel_txs(NULL, &htlcmap, &wscripts, channel,
+	local_txs = channel_txs(chainparams, NULL, &htlcmap, &wscripts, channel,
 				&local_per_commit_point, commitnum, LOCAL);
 
 	printf("## local_commitment\n"
@@ -468,7 +469,7 @@ int main(int argc, char *argv[])
 	/* Create the remote commitment tx */
 	if (!per_commit_point(&remoteseed, &remote_per_commit_point, commitnum))
 		errx(1, "Bad deriving remote per-commitment-point");
-	remote_txs = channel_txs(NULL, &htlcmap, &wscripts, channel,
+	remote_txs = channel_txs(chainparams, NULL, &htlcmap, &wscripts, channel,
 				 &remote_per_commit_point, commitnum, REMOTE);
 	remote_txs[0]->input_amounts[0]
 		= tal_dup(remote_txs[0], struct amount_sat, &funding_amount);

devtools/mkfunding.c

@@ -46,6 +46,7 @@ int main(int argc, char *argv[])
 	const struct utxo **utxomap;
 	struct bitcoin_signature sig;
 	struct bitcoin_txid txid;
+	const struct chainparams *chainparams = chainparams_for_network("bitcoin");
 
 	setup_locale();
 
@@ -106,7 +107,7 @@ int main(int argc, char *argv[])
 	utxomap[0] = &input;
 
 	/* No change output, so we don't need a bip32 base. */
-	tx = funding_tx(NULL, &outnum, utxomap, funding_amount,
+	tx = funding_tx(NULL, chainparams, &outnum, utxomap, funding_amount,
 			&funding_localkey, &funding_remotekey,
 			AMOUNT_SAT(0), NULL, NULL);
 

hsmd/hsmd.c

@@ -102,6 +102,9 @@ struct client {
 
 	/* What is this client allowed to ask for? */
 	u64 capabilities;
+
+	/* Params to apply to all transactions for this client */
+	const struct chainparams *chainparams;
 };
 
 /*~ We keep a map of nonzero dbid -> clients, mainly for leak detection.
@@ -206,6 +209,7 @@ static void destroy_client(struct client *c)
 }
 
 static struct client *new_client(const tal_t *ctx,
+				 const struct chainparams *chainparams,
 				 const struct node_id *id,
 				 u64 dbid,
 				 const u64 capabilities,
@@ -227,6 +231,8 @@ static struct client *new_client(const tal_t *ctx,
 	c->dbid = dbid;
 
 	c->capabilities = capabilities;
+	c->chainparams = chainparams;
+
 	/*~ This is the core of ccan/io: the connection creation calls a
 	 * callback which returns the initial plan to execute: in our case,
 	 * read a message.*/
@@ -593,6 +599,10 @@ static struct io_plan *init_hsm(struct io_conn *conn,
 	dev_force_channel_secrets = secrets;
 	dev_force_channel_secrets_shaseed = shaseed;
 #endif
+
+	/* Once we have read the init message we know which params the master
+	 * will use */
+	c->chainparams = chainparams_by_chainhash(&chain_hash);
 	maybe_create_new_hsm();
 	load_hsm();
 
@@ -1339,7 +1349,7 @@ static struct io_plan *pass_client_hsmfd(struct io_conn *conn,
 			      strerror(errno));
 
 	status_trace("new_client: %"PRIu64, dbid);
-	new_client(c, &id, dbid, capabilities, fds[0]);
+	new_client(c, c->chainparams, &id, dbid, capabilities, fds[0]);
 
 	/*~ We stash this in a global, because we need to get both the fd and
 	 * the client pointer to the callback.  The other way would be to
@@ -1471,7 +1481,7 @@ static struct io_plan *handle_sign_funding_tx(struct io_conn *conn,
 	} else
 		changekey = NULL;
 
-	tx = funding_tx(tmpctx, &outnum,
+	tx = funding_tx(tmpctx, c->chainparams, &outnum,
 			/*~ For simplicity, our generated code is not const
 			 * correct.  The C rules around const and
 			 * pointer-to-pointer are a bit weird, so we use
@@ -1508,9 +1518,9 @@ static struct io_plan *handle_sign_withdrawal_tx(struct io_conn *conn,
 		return bad_req_fmt(conn, c, msg_in,
 				   "Failed to get key %u", change_keyindex);
 
-	tx = withdraw_tx(tmpctx, cast_const2(const struct utxo **, utxos),
-			 scriptpubkey, satoshi_out,
-			 &changekey, change_out, NULL, NULL);
+	tx = withdraw_tx(tmpctx, c->chainparams,
+			 cast_const2(const struct utxo **, utxos), scriptpubkey,
+			 satoshi_out, &changekey, change_out, NULL, NULL);
 
 	sign_all_inputs(tx, utxos);
 
@@ -1854,7 +1864,7 @@ int main(int argc, char *argv[])
 	status_setup_async(status_conn);
 	uintmap_init(&clients);
 
-	master = new_client(NULL, NULL, 0, HSM_CAP_MASTER | HSM_CAP_SIGN_GOSSIP,
+	master = new_client(NULL, NULL, NULL, 0, HSM_CAP_MASTER | HSM_CAP_SIGN_GOSSIP,
 			    REQ_FD);
 
 	/* First client == lightningd. */

lightningd/opening_control.c

@@ -370,6 +370,7 @@ static bool compose_and_broadcast_tx(struct lightningd *ld,
 	struct bitcoin_tx *fundingtx;
 	struct amount_sat change;
 	struct bitcoin_txid funding_txid;
+	const struct chainparams *chainparams = get_chainparams(ld);
 
 	/* Generate the funding tx. */
 	if (!amount_sat_eq(fc->wtx->change, AMOUNT_SAT(0))
@@ -377,7 +378,7 @@ static bool compose_and_broadcast_tx(struct lightningd *ld,
 			     &changekey, fc->wtx->change_key_index))
 		fatal("Error deriving change key %u", fc->wtx->change_key_index);
 
-	fundingtx = funding_tx(tmpctx, &funding_outnum,
+	fundingtx = funding_tx(tmpctx, chainparams, &funding_outnum,
 			       fc->wtx->utxos, fc->wtx->amount,
 			       &fc->uc->local_funding_pubkey,
 			       &channel_info->remote_fundingkey,
@@ -453,6 +454,7 @@ static bool compose_and_broadcast_tx(struct lightningd *ld,
 	if (!fromwire_hsm_sign_funding_reply(tmpctx, msg, &fundingtx))
 		fatal("HSM gave bad sign_funding_reply %s",
 		      tal_hex(msg, resp));
+	fundingtx->chainparams = chainparams;
 
 	/* Extract the change output and add it to the DB */
 	wallet_extract_owned_outputs(ld->wallet, fundingtx, NULL, &change);

onchaind/onchaind.c

@@ -105,6 +105,8 @@ struct tracked_output {
 
 	/* If it is resolved. */
 	struct resolution *resolved;
+
+	const struct chainparams *chainparams;
 };
 
 /* We vary feerate until signature they offered matches. */
@@ -305,7 +307,7 @@ static struct bitcoin_tx *tx_to_us(const tal_t *ctx,
 	u8 *msg;
 	u8 **witness;
 
-	tx = bitcoin_tx(ctx, 1, 1);
+	tx = bitcoin_tx(ctx, out->chainparams, 1, 1);
 	tx->wtx->locktime = locktime;
 	bitcoin_tx_add_input(tx, &out->txid, out->outnum, to_self_delay,
 			     &out->sat, NULL);
@@ -399,16 +401,17 @@ static void hsm_get_per_commitment_point(struct pubkey *per_commitment_point)
 }
 
 static struct tracked_output *
-	new_tracked_output(struct tracked_output ***outs,
-			   const struct bitcoin_txid *txid,
-			   u32 tx_blockheight,
-			   enum tx_type tx_type,
-			   u32 outnum,
-			   struct amount_sat sat,
-			   enum output_type output_type,
-			   const struct htlc_stub *htlc,
-			   const u8 *wscript,
-			   const secp256k1_ecdsa_signature *remote_htlc_sig)
+new_tracked_output(const struct chainparams *chainparams,
+		   struct tracked_output ***outs,
+		   const struct bitcoin_txid *txid,
+		   u32 tx_blockheight,
+		   enum tx_type tx_type,
+		   u32 outnum,
+		   struct amount_sat sat,
+		   enum output_type output_type,
+		   const struct htlc_stub *htlc,
+		   const u8 *wscript,
+		   const secp256k1_ecdsa_signature *remote_htlc_sig)
 {
 	struct tracked_output *out = tal(*outs, struct tracked_output);
 
@@ -427,6 +430,7 @@ static struct tracked_output *
 	out->output_type = output_type;
 	out->proposal = NULL;
 	out->resolved = NULL;
+	out->chainparams = chainparams;
 	if (htlc)
 		out->htlc = *htlc;
 	out->wscript = tal_steal(out, wscript);
@@ -900,7 +904,8 @@ static void handle_htlc_onchain_fulfill(struct tracked_output *out,
 							       &preimage)));
 }
 
-static void resolve_htlc_tx(struct tracked_output ***outs,
+static void resolve_htlc_tx(const struct chainparams *chainparams,
+			    struct tracked_output ***outs,
 			    size_t out_index,
 			    const struct bitcoin_tx *htlc_tx,
 			    const struct bitcoin_txid *htlc_txid,
@@ -925,7 +930,7 @@ static void resolve_htlc_tx(struct tracked_output ***outs,
 	 *         output.
 	 */
 	amt = bitcoin_tx_output_get_amount(htlc_tx, 0);
-	out = new_tracked_output(outs, htlc_txid, tx_blockheight,
+	out = new_tracked_output(chainparams, outs, htlc_txid, tx_blockheight,
 				 (*outs)[out_index]->resolved->tx_type,
 				 0, amt,
 				 DELAYED_OUTPUT_TO_US,
@@ -981,7 +986,8 @@ static void onchain_transaction_annotate(const struct bitcoin_txid *txid,
 	wire_sync_write(REQ_FD, take(msg));
 }
 /* An output has been spent: see if it resolves something we care about. */
-static void output_spent(struct tracked_output ***outs,
+static void output_spent(const struct chainparams *chainparams,
+			 struct tracked_output ***outs,
 			 const struct bitcoin_tx *tx,
 			 u32 input_num,
 			 u32 tx_blockheight)
@@ -1008,7 +1014,7 @@ static void output_spent(struct tracked_output ***outs,
 			/* If it's our htlc tx, we need to resolve that, too. */
 			if (out->resolved->tx_type == OUR_HTLC_SUCCESS_TX
 			    || out->resolved->tx_type == OUR_HTLC_TIMEOUT_TX)
-				resolve_htlc_tx(outs, i, tx, &txid,
+				resolve_htlc_tx(chainparams, outs, i, tx, &txid,
 						tx_blockheight);
 			return;
 		}
@@ -1194,7 +1200,8 @@ static void tx_new_depth(struct tracked_output **outs,
  *       - MUST NOT *resolve* the output by spending it.
  */
 /* Master makes sure we only get told preimages once other node is committed. */
-static void handle_preimage(struct tracked_output **outs,
+static void handle_preimage(const struct chainparams *chainparams,
+			    struct tracked_output **outs,
 			    const struct preimage *preimage)
 {
 	size_t i;
@@ -1249,7 +1256,9 @@ static void handle_preimage(struct tracked_output **outs,
 					      type_to_string(tmpctx,
 							     struct amount_sat,
 							     &outs[i]->sat));
-			tx = htlc_success_tx(outs[i], &outs[i]->txid,
+			tx = htlc_success_tx(outs[i],
+					     chainparams,
+					     &outs[i]->txid,
 					     outs[i]->outnum,
 					     htlc_amount,
 					     to_self_delay[LOCAL],
@@ -1347,7 +1356,8 @@ static bool handle_dev_memleak(struct tracked_output **outs, const u8 *msg)
  *      - MUST monitor the blockchain for transactions that spend any output that
  *      is NOT *irrevocably resolved*.
  */
-static void wait_for_resolved(struct tracked_output **outs)
+static void wait_for_resolved(const struct chainparams *chainparams,
+			      struct tracked_output **outs)
 {
 	billboard_update(outs);
 
@@ -1365,9 +1375,9 @@ static void wait_for_resolved(struct tracked_output **outs)
 			tx_new_depth(outs, &txid, depth);
 		else if (fromwire_onchain_spent(msg, msg, &tx, &input_num,
 						&tx_blockheight))
-			output_spent(&outs, tx, input_num, tx_blockheight);
+			output_spent(chainparams, &outs, tx, input_num, tx_blockheight);
 		else if (fromwire_onchain_known_preimage(msg, &preimage))
-			handle_preimage(outs, &preimage);
+			handle_preimage(chainparams, outs, &preimage);
 		else if (!handle_dev_memleak(outs, msg))
 			master_badmsg(-1, msg);
 
@@ -1387,7 +1397,8 @@ static void init_reply(const char *what)
 	peer_billboard(true, what);
 }
 
-static void handle_mutual_close(const struct bitcoin_txid *txid,
+static void handle_mutual_close(const struct chainparams *chainparams,
+				const struct bitcoin_txid *txid,
 				struct tracked_output **outs)
 {
 	init_reply("Tracking mutual close transaction");
@@ -1402,7 +1413,7 @@ static void handle_mutual_close(const struct bitcoin_txid *txid,
 	 */
 	resolved_by_other(outs[0], txid, MUTUAL_CLOSE);
 
-	wait_for_resolved(outs);
+	wait_for_resolved(chainparams, outs);
 }
 
 static u8 **derive_htlc_scripts(const struct htlc_stub *htlcs, enum side side)
@@ -1432,7 +1443,8 @@ static u8 **derive_htlc_scripts(const struct htlc_stub *htlcs, enum side side)
 	return htlc_scripts;
 }
 
-static size_t resolve_our_htlc_ourcommit(struct tracked_output *out,
+static size_t resolve_our_htlc_ourcommit(const struct chainparams *chainparams,
+					 struct tracked_output *out,
 					 const size_t *matches,
 					 const struct htlc_stub *htlcs,
 					 u8 **htlc_scripts)
@@ -1463,7 +1475,8 @@ static size_t resolve_our_htlc_ourcommit(struct tracked_output *out,
 		 *    - MUST *resolve* the output by spending it using the
 		 *    HTLC-timeout transaction.
 		 */
-		tx = htlc_timeout_tx(tmpctx, &out->txid, out->outnum,
+		tx = htlc_timeout_tx(tmpctx, chainparams,
+				     &out->txid, out->outnum,
 				     htlc_amount,
 				     htlcs[matches[i]].cltv_expiry,
 				     to_self_delay[LOCAL], 0, keyset);
@@ -1778,7 +1791,8 @@ static void handle_our_unilateral(const struct bitcoin_tx *tx,
 			 *       node's `to_self_delay` field) before spending
 			 *       the output.
 			 */
-			out = new_tracked_output(&outs, txid, tx_blockheight,
+			out = new_tracked_output(tx->chainparams,
+						 &outs, txid, tx_blockheight,
 						 OUR_UNILATERAL, i,
 						 amt,
 						 DELAYED_OUTPUT_TO_US,
@@ -1818,7 +1832,8 @@ static void handle_our_unilateral(const struct bitcoin_tx *tx,
 			 *       node, as `to_remote` is considered *resolved*
 			 *       by the commitment transaction itself.
 			 */
-			out = new_tracked_output(&outs, txid, tx_blockheight,
+			out = new_tracked_output(tx->chainparams,
+						 &outs, txid, tx_blockheight,
 						 OUR_UNILATERAL, i,
 						 amt,
 						 OUTPUT_TO_THEM,
@@ -1844,7 +1859,8 @@ static void handle_our_unilateral(const struct bitcoin_tx *tx,
 			 *       in [HTLC Output Handling: Local Commitment,
 			 *       Local Offers]
 			 */
-			out = new_tracked_output(&outs, txid,
+			out = new_tracked_output(tx->chainparams,
+						 &outs, txid,
 						 tx_blockheight,
 						 OUR_UNILATERAL, i,
 						 amt,
@@ -1852,11 +1868,13 @@ static void handle_our_unilateral(const struct bitcoin_tx *tx,
 						 NULL, NULL,
 						 remote_htlc_sigs);
 			/* Tells us which htlc to use */
-			which_htlc = resolve_our_htlc_ourcommit(out, matches,
+			which_htlc = resolve_our_htlc_ourcommit(tx->chainparams,
+								out, matches,
 								htlcs,
 								htlc_scripts);
 		} else {
-			out = new_tracked_output(&outs, txid,
+			out = new_tracked_output(tx->chainparams,
+						 &outs, txid,
 						 tx_blockheight,
 						 OUR_UNILATERAL, i,
 						 amt,
@@ -1885,7 +1903,7 @@ static void handle_our_unilateral(const struct bitcoin_tx *tx,
 
 	note_missing_htlcs(htlc_scripts, htlcs,
 			   tell_if_missing, tell_immediately);
-	wait_for_resolved(outs);
+	wait_for_resolved(tx->chainparams, outs);
 }
 
 /* We produce individual penalty txs.  It's less efficient, but avoids them
@@ -2085,7 +2103,8 @@ static void handle_their_cheat(const struct bitcoin_tx *tx,
 			 *     - Note: this output is considered *resolved* by
 			 *       the commitment transaction itself.
 			 */
-			out = new_tracked_output(&outs, txid, tx_blockheight,
+			out = new_tracked_output(tx->chainparams,
+						 &outs, txid, tx_blockheight,
 						 THEIR_REVOKED_UNILATERAL,
 						 i, amt,
 						 OUTPUT_TO_US, NULL, NULL, NULL);
@@ -2109,7 +2128,8 @@ static void handle_their_cheat(const struct bitcoin_tx *tx,
 			 *   - MUST *resolve* the _remote node's main output_ by
 			 *     spending it using the revocation private key.
 			*/
-			out = new_tracked_output(&outs, txid, tx_blockheight,
+			out = new_tracked_output(tx->chainparams,
+						 &outs, txid, tx_blockheight,
 						 THEIR_REVOKED_UNILATERAL, i,
 						 amt,
 						 DELAYED_OUTPUT_TO_THEM,
@@ -2136,7 +2156,8 @@ static void handle_their_cheat(const struct bitcoin_tx *tx,
 			 *     * spend the *commitment tx* once the HTLC timeout has passed.
 			 *     * spend the *HTLC-success tx*, if the remote node has published it.
 			 */
-			out = new_tracked_output(&outs, txid,
+			out = new_tracked_output(tx->chainparams,
+						 &outs, txid,
 						 tx_blockheight,
 						 THEIR_REVOKED_UNILATERAL, i,
 						 amt,
@@ -2146,7 +2167,8 @@ static void handle_their_cheat(const struct bitcoin_tx *tx,
 						 NULL);
 			steal_htlc(out);
 		} else {
-			out = new_tracked_output(&outs, txid,
+			out = new_tracked_output(tx->chainparams,
+						 &outs, txid,
 						 tx_blockheight,
 						 THEIR_REVOKED_UNILATERAL, i,
 						 amt,
@@ -2168,7 +2190,7 @@ static void handle_their_cheat(const struct bitcoin_tx *tx,
 
 	note_missing_htlcs(htlc_scripts, htlcs,
 			   tell_if_missing, tell_immediately);
-	wait_for_resolved(outs);
+	wait_for_resolved(tx->chainparams, outs);
 }
 
 static void handle_their_unilateral(const struct bitcoin_tx *tx,
@@ -2301,7 +2323,8 @@ static void handle_their_unilateral(const struct bitcoin_tx *tx,
 			 *   - Note: `to_remote` is considered *resolved* by the
 			 *     commitment transaction itself.
 			 */
-			out = new_tracked_output(&outs, txid, tx_blockheight,
+			out = new_tracked_output(tx->chainparams,
+						 &outs, txid, tx_blockheight,
 						 THEIR_UNILATERAL,
 						 i, amt,
 						 OUTPUT_TO_US, NULL, NULL, NULL);
@@ -2328,7 +2351,8 @@ static void handle_their_unilateral(const struct bitcoin_tx *tx,
 			 *   - Note: `to_local` is considered *resolved* by the
 			 *     commitment transaction itself.
 			 */
-			out = new_tracked_output(&outs, txid, tx_blockheight,
+			out = new_tracked_output(tx->chainparams,
+						 &outs, txid, tx_blockheight,
 						 THEIR_UNILATERAL, i,
 						 amt,
 						 DELAYED_OUTPUT_TO_THEM,
@@ -2350,7 +2374,8 @@ static void handle_their_unilateral(const struct bitcoin_tx *tx,
 			 *   [HTLC Output Handling: Remote Commitment,
 			 *   Local Offers]
 			 */
-			out = new_tracked_output(&outs, txid,
+			out = new_tracked_output(tx->chainparams,
+						 &outs, txid,
 						 tx_blockheight,
 						 THEIR_UNILATERAL, i,
 						 amt,
@@ -2362,7 +2387,8 @@ static void handle_their_unilateral(const struct bitcoin_tx *tx,
 								  htlcs,
 								  htlc_scripts);
 		} else {
-			out = new_tracked_output(&outs, txid,
+			out = new_tracked_output(tx->chainparams,
+						 &outs, txid,
 						 tx_blockheight,
 						 THEIR_UNILATERAL, i,
 						 amt,
@@ -2385,7 +2411,7 @@ static void handle_their_unilateral(const struct bitcoin_tx *tx,
 
 	note_missing_htlcs(htlc_scripts, htlcs,
 			   tell_if_missing, tell_immediately);
-	wait_for_resolved(outs);
+	wait_for_resolved(tx->chainparams, outs);
 }
 
 static void handle_unknown_commitment(const struct bitcoin_tx *tx,
@@ -2435,7 +2461,8 @@ static void handle_unknown_commitment(const struct bitcoin_tx *tx,
 			 *   - Note: `to_remote` is considered *resolved* by the
 			 *     commitment transaction itself.
 			 */
-			out = new_tracked_output(&outs, txid, tx_blockheight,
+			out = new_tracked_output(tx->chainparams,
+						 &outs, txid, tx_blockheight,
 						 UNKNOWN_UNILATERAL,
 						 i, amt,
 						 OUTPUT_TO_US, NULL, NULL, NULL);
@@ -2477,7 +2504,7 @@ search_done:
 		wire_sync_write(REQ_FD, take(msg));
 	}
 
-	wait_for_resolved(outs);
+	wait_for_resolved(tx->chainparams, outs);
 }
 
 int main(int argc, char *argv[])
@@ -2538,6 +2565,8 @@ int main(int argc, char *argv[])
 		master_badmsg(WIRE_ONCHAIN_INIT, msg);
 	}
 
+	tx->chainparams = chainparams_by_chainhash(&chain_hash);
+
 	status_trace("feerate_per_kw = %u", feerate_per_kw);
 	bitcoin_txid(tx, &txid);
 	/* We need to keep tx around, but there's only one: not really a leak */
@@ -2561,7 +2590,7 @@ int main(int argc, char *argv[])
 
 	outs = tal_arr(ctx, struct tracked_output *, 0);
 	bitcoin_tx_input_get_txid(tx, 0, &tmptxid);
-	new_tracked_output(&outs, &tmptxid,
+	new_tracked_output(tx->chainparams, &outs, &tmptxid,
 			   0, /* We don't care about funding blockheight */
 			   FUNDING_TRANSACTION,
 			   tx->wtx->inputs[0].index,
@@ -2586,7 +2615,7 @@ int main(int argc, char *argv[])
 	 * [BOLT #2: Channel Close](02-peer-protocol.md#channel-close)).
 	 */
 	if (is_mutual_close(tx, scriptpubkey[LOCAL], scriptpubkey[REMOTE]))
-		handle_mutual_close(&txid, outs);
+		handle_mutual_close(tx->chainparams, &txid, outs);
 	else {
 		/* BOLT #5:
 		 *

onchaind/test/run-grind_feerate.c

@@ -64,6 +64,7 @@ u8 *htlc_received_wscript(const tal_t *ctx UNNEEDED,
 { fprintf(stderr, "htlc_received_wscript called!\n"); abort(); }
 /* Generated stub for htlc_success_tx */
 struct bitcoin_tx *htlc_success_tx(const tal_t *ctx UNNEEDED,
+				   const struct chainparams *chainparams UNNEEDED,
 				   const struct bitcoin_txid *commit_txid UNNEEDED,
 				   unsigned int commit_output_number UNNEEDED,
 				   struct amount_msat htlc_msatoshi UNNEEDED,
@@ -73,6 +74,7 @@ struct bitcoin_tx *htlc_success_tx(const tal_t *ctx UNNEEDED,
 { fprintf(stderr, "htlc_success_tx called!\n"); abort(); }
 /* Generated stub for htlc_timeout_tx */
 struct bitcoin_tx *htlc_timeout_tx(const tal_t *ctx UNNEEDED,
+				   const struct chainparams *chainparams UNNEEDED,
 				   const struct bitcoin_txid *commit_txid UNNEEDED,
 				   unsigned int commit_output_number UNNEEDED,
 				   struct amount_msat htlc_msatoshi UNNEEDED,
@@ -205,6 +207,7 @@ int main(int argc, char *argv[])
 				 strlen("0200000001e1ebca08cf1c301ac563580a1126d5c8fcb0e5e2043230b852c726553caf1e1d0000000000000000000160ae0a000000000022002082e03c5a9cb79c82cd5a0572dc175290bc044609aabe9cc852d61927436041796d000000"));
 	tx->input_amounts[0] = tal(tx, struct amount_sat);
 	*tx->input_amounts[0] = AMOUNT_SAT(700000);
+	tx->chainparams = chainparams_for_network("bitcoin");
 	der = tal_hexdata(tmpctx, "30450221009b2e0eef267b94c3899fb0dc7375012e2cee4c10348a068fe78d1b82b4b14036022077c3fad3adac2ddf33f415e45f0daf6658b7a0b09647de4443938ae2dbafe2b9" "01",
 			  strlen("30450221009b2e0eef267b94c3899fb0dc7375012e2cee4c10348a068fe78d1b82b4b14036022077c3fad3adac2ddf33f415e45f0daf6658b7a0b09647de4443938ae2dbafe2b9" "01"));
 	if (!signature_from_der(der, tal_count(der), &sig))

openingd/openingd.c

@@ -1069,7 +1069,7 @@ static u8 *funder_channel(struct state *state,
 	 * it; lightningd will recreate it (and have the HSM sign it) when
 	 * we've completed opening negotiation.
 	 */
-	funding = funding_tx(state, &state->funding_txout,
+	funding = funding_tx(state, state->chainparams, &state->funding_txout,
 			     cast_const2(const struct utxo **, utxos),
 			     state->funding,
 			     &state->our_funding_pubkey,

wallet/walletrpc.c

@@ -128,6 +128,7 @@ static struct command_result *broadcast_and_wait(struct command *cmd,
 	if (!fromwire_hsm_sign_withdrawal_reply(utx, msg, &signed_tx))
 		fatal("HSM gave bad sign_withdrawal_reply %s",
 		      tal_hex(tmpctx, msg));
+	signed_tx->chainparams = utx->tx->chainparams;
 
 	/* Sanity check */
 	bitcoin_txid(signed_tx, &signed_txid);
@@ -199,7 +200,7 @@ static struct command_result *json_prepare_tx(struct command *cmd,
 			return command_fail(cmd, LIGHTNINGD, "Keys generation failure");
 	}
 
-	(*utx)->tx = withdraw_tx(*utx, (*utx)->wtx->utxos,
+	(*utx)->tx = withdraw_tx(*utx, get_chainparams(cmd->ld), (*utx)->wtx->utxos,
 				 (*utx)->destination, (*utx)->wtx->amount,
 				 changekey, (*utx)->wtx->change,
 				 cmd->ld->wallet->bip32_base,