sign_tx: add sign_utils.h to declare the types and functions used by signing

diff --git a/main/assets.h b/main/assets.h
index b8fe3c7..7f7a402 100644
--- a/main/assets.h
+++ b/main/assets.h
@@ -5,7 +5,7 @@
 #include "utils/network.h"
 
 // NOTE: strings here may not be nul-terminated as may directly reference message fields
-typedef struct {
+typedef struct _asset_info {
     const char* asset_id;
     const char* ticker;
     const char* issuer_domain;
diff --git a/main/process/sign_psbt.c b/main/process/sign_psbt.c
index 2039b70..eb94bf4 100644
--- a/main/process/sign_psbt.c
+++ b/main/process/sign_psbt.c
@@ -25,13 +25,7 @@
 #include <wally_psbt_members.h>
 #include <wally_script.h>
 
-#include "process_utils.h"
-
-bool show_btc_fee_confirmation_activity(network_t network_id, const struct wally_tx* tx, const output_info_t* outinfo,
-    script_flavour_t aggregate_inputs_scripts_flavour, uint64_t input_amount, uint64_t output_amount);
-bool show_elements_fee_confirmation_activity(network_t network_id, const struct wally_tx* tx,
-    const output_info_t* outinfo, script_flavour_t aggregate_inputs_scripts_flavour, uint64_t fees, TxType_t txtype,
-    bool is_partial);
+#include "sign_utils.h"
 
 // From https://github.com/bitcoin/bips/blob/master/bip-0174.mediawiki
 static const uint8_t PSBT_MAGIC_PREFIX[5] = { 0x70, 0x73, 0x62, 0x74, 0xFF }; // 'psbt' + 0xff
diff --git a/main/process/sign_tx.c b/main/process/sign_tx.c
index ea96e2b..294d67d 100644
--- a/main/process/sign_tx.c
+++ b/main/process/sign_tx.c
@@ -21,27 +21,7 @@
 #include <wally_map.h>
 #include <wally_script.h>
 
-#include "process_utils.h"
-
-bool rpc_get_trusted_commitments(
-    jade_process_t* process, const CborValue* value, const struct wally_tx* tx, commitment_t** data);
-TxType_t rpc_get_additional_info(jade_process_t* process, CborValue* params, const struct wally_tx* tx,
-    TxType_t* txtype, bool* is_partial, asset_summary_t** in_sums, size_t* num_in_sums, asset_summary_t** out_sums,
-    size_t* num_out_sums);
-bool validate_elements_outputs(jade_process_t* process, const network_t network_id, const struct wally_tx* tx,
-    const TxType_t txtype, commitment_t* commitments, output_info_t* output_info, asset_summary_t* in_sums,
-    const size_t num_in_sums, asset_summary_t* out_sums, const size_t num_out_sums, uint64_t* fees);
-bool get_commitment_data(CborValue* item, commitment_t* commitment);
-bool verify_commitment_consistent(const commitment_t* commitments, const char** errmsg);
-bool asset_summary_update(asset_summary_t* sums, const size_t num_sums, const uint8_t* asset_id,
-    const size_t asset_id_len, const uint64_t value);
-bool asset_summary_validate(asset_summary_t* sums, const size_t num_sums);
-
-bool show_btc_fee_confirmation_activity(network_t network_id, const struct wally_tx* tx, const output_info_t* outinfo,
-    script_flavour_t aggregate_inputs_scripts_flavour, uint64_t input_amount, uint64_t output_amount);
-bool show_elements_fee_confirmation_activity(network_t network_id, const struct wally_tx* tx,
-    const output_info_t* outinfo, script_flavour_t aggregate_inputs_scripts_flavour, uint64_t fees, TxType_t txtype,
-    bool is_partial);
+#include "sign_utils.h"
 
 struct wally_tx* rpc_get_signing_tx(
     jade_process_t* process, const CborValue* params, const network_t network_id, const bool for_liquid)
diff --git a/main/process/sign_utils.c b/main/process/sign_utils.c
index 1cf2f50..5f2ac4d 100644
--- a/main/process/sign_utils.c
+++ b/main/process/sign_utils.c
@@ -1,4 +1,5 @@
 #ifndef AMALGAMATED_BUILD
+#include "sign_utils.h"
 #include "../jade_assert.h"
 #include "../jade_wally_verify.h"
 #include "../ui/sign_tx.h"
diff --git a/main/process/sign_utils.h b/main/process/sign_utils.h
new file mode 100644
index 0000000..01f026e
--- /dev/null
+++ b/main/process/sign_utils.h
@@ -0,0 +1,48 @@
+#ifndef SIGN_UTILS_H_
+#define SIGN_UTILS_H_
+
+#include "process_utils.h"
+
+typedef enum { TXTYPE_SEND_PAYMENT, TXTYPE_SWAP } TxType_t;
+
+typedef struct _output_info {
+    char message[128];
+    uint8_t blinding_key[33];
+    uint8_t asset_id[32];
+    uint64_t value;
+    uint8_t flags;
+} output_info_t;
+
+typedef struct _asset_summary {
+    uint8_t asset_id[32];
+    uint64_t value;
+    uint64_t validated_value;
+} asset_summary_t;
+
+bool rpc_get_trusted_commitments(
+    jade_process_t* process, const CborValue* value, const struct wally_tx* tx, commitment_t** data);
+
+TxType_t rpc_get_additional_info(jade_process_t* process, CborValue* params, const struct wally_tx* tx,
+    TxType_t* txtype, bool* is_partial, asset_summary_t** in_sums, size_t* num_in_sums, asset_summary_t** out_sums,
+    size_t* num_out_sums);
+
+bool get_commitment_data(CborValue* item, commitment_t* commitment);
+bool verify_commitment_consistent(const commitment_t* commitments, const char** errmsg);
+
+bool asset_summary_update(
+    asset_summary_t* sums, size_t num_sums, const uint8_t* asset_id, size_t asset_id_len, uint64_t value);
+
+bool asset_summary_validate(asset_summary_t* sums, size_t num_sums);
+
+bool validate_elements_outputs(jade_process_t* process, network_t network_id, const struct wally_tx* tx,
+    TxType_t txtype, commitment_t* commitments, output_info_t* output_info, asset_summary_t* in_sums,
+    size_t num_in_sums, asset_summary_t* out_sums, size_t num_out_sums, uint64_t* fees);
+
+bool show_btc_fee_confirmation_activity(network_t network_id, const struct wally_tx* tx, const output_info_t* outinfo,
+    script_flavour_t aggregate_inputs_scripts_flavour, uint64_t input_amount, uint64_t output_amount);
+
+bool show_elements_fee_confirmation_activity(network_t network_id, const struct wally_tx* tx,
+    const output_info_t* outinfo, script_flavour_t aggregate_inputs_scripts_flavour, uint64_t fees, TxType_t txtype,
+    bool is_partial);
+
+#endif /* SIGN_UTILS_H_ */
diff --git a/main/ui.h b/main/ui.h
index ec81a1f..2a69b8a 100644
--- a/main/ui.h
+++ b/main/ui.h
@@ -83,22 +83,6 @@ typedef enum { QR_GUIDES_NONE, QR_GUIDES_SMALL, QR_GUIDES_LARGE } qr_frame_guide
 #define OUTPUT_FLAG_CHANGE 8
 #define OUTPUT_FLAG_HAS_UNBLINDED 16
 
-typedef enum { TXTYPE_SEND_PAYMENT, TXTYPE_SWAP } TxType_t;
-
-typedef struct {
-    char message[128];
-    uint8_t blinding_key[33];
-    uint8_t asset_id[32];
-    uint64_t value;
-    uint8_t flags;
-} output_info_t;
-
-typedef struct {
-    uint8_t asset_id[32];
-    uint64_t value;
-    uint64_t validated_value;
-} asset_summary_t;
-
 // Progress bar
 typedef struct {
     bool transparent;
diff --git a/main/ui/sign_tx.c b/main/ui/sign_tx.c
index c27c775..ef1aa84 100644
--- a/main/ui/sign_tx.c
+++ b/main/ui/sign_tx.c
@@ -8,6 +8,7 @@
 #include "../button_events.h"
 #include "../jade_assert.h"
 #include "../jade_wally_verify.h"
+#include "../process/sign_utils.h"
 #include "../ui.h"
 #include "../ui/sign_tx.h"
 #include "../utils/address.h"
diff --git a/main/ui/sign_tx.h b/main/ui/sign_tx.h
index 97ba268..87943d0 100644
--- a/main/ui/sign_tx.h
+++ b/main/ui/sign_tx.h
@@ -4,9 +4,9 @@
 #include "../ui.h"
 #include "../utils/network.h"
 
-struct asset_info_t;
-struct asset_summary_t;
-struct output_info_t;
+typedef struct _asset_info asset_info_t;
+typedef struct _asset_summary asset_summary_t;
+typedef struct _output_info output_info_t;
 struct wally_tx;
 
 bool show_btc_transaction_outputs_activity(