interactive_tx: Add verbose logging

diff --git a/common/interactivetx.c b/common/interactivetx.c
index 0a72a7df..03ceb9d1 100644
--- a/common/interactivetx.c
+++ b/common/interactivetx.c
@@ -23,6 +23,10 @@
 #include <common/subdaemon.h>
 #include <common/wire_error.h>
 
+#ifndef SUPERVERBOSE
+#define SUPERVERBOSE(...)
+#endif
+
 /*
  * BOLT #2:
  * The receiving node: ...
@@ -197,6 +201,18 @@ static u8 *read_next_msg(const tal_t *ctx,
 	}
 }
 
+#define SHA_FMT					   \
+	"%02x%02x%02x%02x%02x%02x%02x%02x"	   \
+	"%02x%02x%02x%02x%02x%02x%02x%02x"	   \
+	"%02x%02x%02x%02x%02x%02x%02x%02x"	   \
+	"%02x%02x%02x%02x%02x%02x%02x%02x"
+
+#define SHA_VALS(e)							\
+	e[0], e[1], e[2], e[3], e[4], e[5], e[6], e[7],			\
+		e[8], e[9], e[10], e[11], e[12], e[13], e[14], e[15],	\
+		e[16], e[17], e[18], e[19], e[20], e[21], e[22], e[23], \
+		e[24], e[25], e[25], e[26], e[28], e[29], e[30], e[31]
+
 static char *send_next(const tal_t *ctx,
 		       struct interactivetx_context *ictx,
 		       bool *finished)
@@ -268,6 +284,10 @@ static char *send_next(const tal_t *ctx,
 			return "interactivetx RM_INPUT PSBT has invalid"
 			       " serial_id.";
 
+		SUPERVERBOSE("Removing input "SHA_FMT" with serial_id %s",
+			     SHA_VALS(set->rm_ins[0].input.txhash),
+			     tal_hexstr(ctx, &serial_id, sizeof(serial_id)));
+
 		msg = towire_tx_remove_input(NULL, cid, serial_id);
 
 		tal_arr_remove(&set->rm_ins, 0);
@@ -404,6 +424,36 @@ char *process_interactivetx_updates(const tal_t *ctx,
 	if (!next_psbt)
 		next_psbt = ictx->current_psbt;
 
+	SUPERVERBOSE("itx get_changes %zu inputs -> %zu inputs",
+		     ictx->current_psbt->num_inputs,
+		     next_psbt->num_inputs);
+
+	SUPERVERBOSE("current_psbt inputs:");
+	for(size_t i = 0; i < ictx->current_psbt->num_inputs; i++) {
+		u64 serial_id;
+		if (!psbt_get_serial_id(&ictx->current_psbt->inputs[i].unknowns,
+					&serial_id))
+			return "interactivetx ADD_INPUT PSBT has invalid"
+			       " serial_id.";
+		SUPERVERBOSE("txhash: "SHA_FMT", index: %"PRIu32", serial_id: %s",
+			     SHA_VALS(ictx->current_psbt->inputs[i].txhash),
+			     ictx->current_psbt->inputs[i].index,
+			     tal_hexstr(ctx, &serial_id, sizeof(serial_id)));
+	}
+
+	SUPERVERBOSE("next_psbt inputs:");
+	for(size_t i = 0; i < next_psbt->num_inputs; i++) {
+		u64 serial_id;
+		if (!psbt_get_serial_id(&next_psbt->inputs[i].unknowns,
+					&serial_id))
+			return "interactivetx ADD_INPUT PSBT has invalid"
+			       " serial_id.";
+		SUPERVERBOSE("txhash: "SHA_FMT", index: %"PRIu32", serial_id: %s",
+			     SHA_VALS(next_psbt->inputs[i].txhash),
+			     next_psbt->inputs[i].index,
+			     tal_hexstr(ctx, &serial_id, sizeof(serial_id)));
+	}
+
 	ictx->change_set = get_changes(ctx, ictx, next_psbt);
 
 	/* If current_psbt and next_psbt are the same, dont double free it!