sign_tx: rename signing cbor getters to match the other params() calls

diff --git a/main/process/sign_tx.c b/main/process/sign_tx.c
index 294d67d..f097cf6 100644
--- a/main/process/sign_tx.c
+++ b/main/process/sign_tx.c
@@ -23,7 +23,7 @@
 
 #include "sign_utils.h"
 
-struct wally_tx* rpc_get_signing_tx(
+static struct wally_tx* params_txn(
     jade_process_t* process, const CborValue* params, const network_t network_id, const bool for_liquid)
 {
     struct wally_tx* tx = NULL;
@@ -97,7 +97,7 @@ fail:
 }
 
 // Can optionally be passed paths for change outputs, which we verify internally
-bool rpc_get_signing_outputs(jade_process_t* process, const CborValue* params, const network_t network_id,
+static bool params_signing_outputs(jade_process_t* process, const CborValue* params, const network_t network_id,
     const bool for_liquid, const struct wally_tx* tx, output_info_t** output_info)
 {
     JADE_ASSERT(process);
@@ -502,7 +502,7 @@ static void sign_tx_impl(jade_process_t* process, const bool for_liquid)
     CHECK_NETWORK_CONSISTENT(process);
     const jade_msg_source_t source = process->ctx.source;
 
-    struct wally_tx* tx = rpc_get_signing_tx(process, &params, network_id, for_liquid);
+    struct wally_tx* tx = params_txn(process, &params, network_id, for_liquid);
     if (!tx) {
         goto cleanup;
     }
@@ -514,13 +514,13 @@ static void sign_tx_impl(jade_process_t* process, const bool for_liquid)
 
     commitment_t* commitments = NULL;
     // Liquid: Copy trusted commitment data so we can free the message
-    if (for_liquid && !rpc_get_trusted_commitments(process, &params, tx, &commitments)) {
+    if (for_liquid && !params_trusted_commitments(process, &params, tx, &commitments)) {
         goto cleanup;
     }
 
     // Optional info for wallet outputs
     output_info_t* output_info = NULL;
-    if (!rpc_get_signing_outputs(process, &params, network_id, for_liquid, tx, &output_info)) {
+    if (!params_signing_outputs(process, &params, network_id, for_liquid, tx, &output_info)) {
         goto cleanup;
     }
 
@@ -545,7 +545,7 @@ static void sign_tx_impl(jade_process_t* process, const bool for_liquid)
     TxType_t txtype = TXTYPE_SEND_PAYMENT;
     // Liquid: Get any data from the optional 'additional_info' section
     if (for_liquid
-        && !rpc_get_additional_info(
+        && !params_additional_info(
             process, &params, tx, &txtype, &is_partial, &in_sums, &num_in_sums, &out_sums, &num_out_sums)) {
         goto cleanup;
     }
diff --git a/main/process/sign_utils.c b/main/process/sign_utils.c
index 5f2ac4d..86de814 100644
--- a/main/process/sign_utils.c
+++ b/main/process/sign_utils.c
@@ -131,9 +131,8 @@ done:
     return true;
 }
 
-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)
+TxType_t params_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)
 {
     JADE_ASSERT(params);
     JADE_ASSERT(tx);
@@ -147,7 +146,7 @@ TxType_t rpc_get_additional_info(jade_process_t* process, CborValue* params, con
     *is_partial = false;
     *txtype = TXTYPE_SEND_PAYMENT;
 
-    // If no 'additional_data' passed, assume this is a a simple send-payment 'classic' tx
+    // If no 'additional_info' passed, assume this is a a simple send-payment 'classic' tx
     CborValue additional_info;
     if (!rpc_get_map("additional_info", params, &additional_info)) {
         return true;
@@ -280,18 +279,18 @@ bool get_commitment_data(CborValue* item, commitment_t* commitment)
     return true;
 }
 
-bool rpc_get_trusted_commitments(
-    jade_process_t* process, const CborValue* value, const struct wally_tx* tx, commitment_t** data)
+bool params_trusted_commitments(
+    jade_process_t* process, const CborValue* params, const struct wally_tx* tx, commitment_t** data)
 {
     JADE_ASSERT(process);
-    JADE_ASSERT(value);
+    JADE_ASSERT(params);
     JADE_ASSERT(tx);
     JADE_INIT_OUT_PPTR(data);
 
     const char* errmsg = NULL;
 
     CborValue result;
-    if (!rpc_get_array("trusted_commitments", value, &result)) {
+    if (!rpc_get_array("trusted_commitments", params, &result)) {
         errmsg = "Failed to extract trusted commitments from parameters";
         goto cleanup;
     }
diff --git a/main/process/sign_utils.h b/main/process/sign_utils.h
index 01f026e..d3162f5 100644
--- a/main/process/sign_utils.h
+++ b/main/process/sign_utils.h
@@ -19,12 +19,11 @@ typedef struct _asset_summary {
     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);
+bool params_trusted_commitments(
+    jade_process_t* process, const CborValue* params, 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);
+TxType_t params_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);