diff --git a/.github/workflows/lint-workflow.yml b/.github/workflows/lint-workflow.yml
index dbcbbc4b..69b7cdc9 100644
--- a/.github/workflows/lint-workflow.yml
+++ b/.github/workflows/lint-workflow.yml
@@ -45,4 +45,4 @@ jobs:
         # Use Config file when the github action supports it
         builtin: clear,rare
         check_filenames: true
-        skip: ./libsol/printer_test.c,./tests/Cargo.lock,./tools/apdu_generator/Cargo.lock
+        skip: ./libsol/printer_test.c,./tests/Cargo.lock,./tools/apdu_generator/Cargo.lock,./tests/python/apps/solana_utils.py
diff --git a/libsol/common_byte_strings.h b/libsol/common_byte_strings.h
index 6c0bf00c..0ab6cc10 100644
--- a/libsol/common_byte_strings.h
+++ b/libsol/common_byte_strings.h
@@ -88,3 +88,7 @@
     0x06, 0xa7, 0xd5, 0x17, 0x19, 0x2c, 0x5c, 0x51, 0x21, 0x8c, 0xc9, 0x4c, 0x3d, 0x4a, 0xf1,     \
         0x7f, 0x58, 0xda, 0xee, 0x08, 0x9b, 0xa1, 0xfd, 0x44, 0xe3, 0xdb, 0xd9, 0x8a, 0x00, 0x00, \
         0x00, 0x00
+
+// Domain specifiers
+#define OFFCHAIN_MESSAGE_SIGNING_DOMAIN /* "\xffsolana offchain" */ \
+    0xff, 0x73, 0x6f, 0x6c, 0x61, 0x6e, 0x61, 0x20, 0x6f, 0x66, 0x66, 0x63, 0x68, 0x61, 0x69, 0x6e
diff --git a/libsol/include/sol/offchain_message_signing.h b/libsol/include/sol/offchain_message_signing.h
new file mode 100644
index 00000000..be25b25d
--- /dev/null
+++ b/libsol/include/sol/offchain_message_signing.h
@@ -0,0 +1,19 @@
+#pragma once
+#include <stdint.h>
+
+#define OFFCHAIN_MESSAGE_SIGNING_DOMAIN_LENGTH 16
+
+/**
+ * 1. Signing domain (16 bytes)
+ * 2. Header version (1 byte)
+ * 3. Application domain (32 bytes)
+ * 4. Message format (1 byte)
+ * 5. Signer count (1 bytes)
+ * 6. Signers (signer_count *  32 bytes) - assume that only one signer is present
+ * 7. Message length (2 bytes)
+ */
+typedef struct OffchainMessageSigningDomain {
+    uint8_t data[OFFCHAIN_MESSAGE_SIGNING_DOMAIN_LENGTH];
+} OffchainMessageSigningDomain;
+
+extern const OffchainMessageSigningDomain offchain_message_signing_domain;
diff --git a/libsol/include/sol/parser.h b/libsol/include/sol/parser.h
index 70ff0e16..c0083e1e 100644
--- a/libsol/include/sol/parser.h
+++ b/libsol/include/sol/parser.h
@@ -59,9 +59,18 @@ typedef struct MessageHeader {
     size_t instructions_length;
 } MessageHeader;
 
+//@TODO move to offchain message sign .h
+#define OFFCHAIN_MESSAGE_APPLICATION_DOMAIN_LENGTH 32
+typedef struct OffchainMessageApplicationDomain {
+    uint8_t data[OFFCHAIN_MESSAGE_APPLICATION_DOMAIN_LENGTH];
+} OffchainMessageApplicationDomain;
+
 typedef struct OffchainMessageHeader {
     uint8_t version;
+    const OffchainMessageApplicationDomain *application_domain;
     uint8_t format;
+    size_t signers_length;
+    const Pubkey *signers;
     uint16_t length;
 } OffchainMessageHeader;
 
diff --git a/libsol/include/sol/string_utils.h b/libsol/include/sol/string_utils.h
new file mode 100644
index 00000000..a1396b90
--- /dev/null
+++ b/libsol/include/sol/string_utils.h
@@ -0,0 +1,7 @@
+#pragma once
+#include <stdint.h>
+#include <string.h>
+#include <stdbool.h>
+
+bool is_data_utf8(const uint8_t *data, size_t length);
+bool is_data_ascii(const uint8_t *data, size_t length);
\ No newline at end of file
diff --git a/libsol/include/sol/transaction_summary.h b/libsol/include/sol/transaction_summary.h
index 5dd05686..1cbb2d8c 100644
--- a/libsol/include/sol/transaction_summary.h
+++ b/libsol/include/sol/transaction_summary.h
@@ -44,6 +44,7 @@ enum SummaryItemKind {
     SummaryItemSizedString,
     SummaryItemString,
     SummaryItemTimestamp,
+    SummaryItemOffchainMessageApplicationDomain,
 };
 typedef enum SummaryItemKind SummaryItemKind_t;
 
@@ -51,6 +52,7 @@ typedef struct SummaryItem SummaryItem;
 
 extern char G_transaction_summary_title[TITLE_SIZE];
 #define TEXT_BUFFER_LENGTH BASE58_PUBKEY_LENGTH
+
 extern char G_transaction_summary_text[TEXT_BUFFER_LENGTH];
 
 void transaction_summary_reset();
@@ -85,3 +87,7 @@ void summary_item_set_hash(SummaryItem *item, const char *title, const Hash *val
 void summary_item_set_sized_string(SummaryItem *item, const char *title, const SizedString *value);
 void summary_item_set_string(SummaryItem *item, const char *title, const char *value);
 void summary_item_set_timestamp(SummaryItem *item, const char *title, int64_t value);
+void summary_item_set_offchain_message_application_domain(
+    SummaryItem *item,
+    const char *title,
+    const OffchainMessageApplicationDomain *value);
\ No newline at end of file
diff --git a/libsol/message.c b/libsol/message.c
index 3c0b85a3..52e30e75 100644
--- a/libsol/message.c
+++ b/libsol/message.c
@@ -117,7 +117,7 @@ int process_message_body(const uint8_t *message_body,
     // Ensure we've consumed the entire message body
     BAIL_IF(!parser_is_empty(&parser));
 
-    // If we don't know about all of the instructions, bail
+    // If we don't know about all the instructions, bail
     for (size_t i = 0; i < instruction_count; i++) {
         BAIL_IF(instruction_info[i].kind == ProgramIdUnknown);
     }
diff --git a/libsol/offchain_message_signing.c b/libsol/offchain_message_signing.c
new file mode 100644
index 00000000..22f5df09
--- /dev/null
+++ b/libsol/offchain_message_signing.c
@@ -0,0 +1,5 @@
+#include "sol/offchain_message_signing.h"
+#include "common_byte_strings.h"
+
+const OffchainMessageSigningDomain offchain_message_signing_domain = {
+    {OFFCHAIN_MESSAGE_SIGNING_DOMAIN}};
diff --git a/libsol/parser.c b/libsol/parser.c
index 63a645b4..c7ccaec2 100644
--- a/libsol/parser.c
+++ b/libsol/parser.c
@@ -1,10 +1,7 @@
 #include "sol/parser.h"
+#include "sol/offchain_message_signing.h"
 #include "util.h"
 
-#define OFFCHAIN_MESSAGE_SIGNING_DOMAIN \
-    "\xff"                              \
-    "solana offchain"
-
 static int check_buffer_length(Parser *parser, size_t num) {
     return parser->buffer_length < num ? 1 : 0;
 }
@@ -115,6 +112,14 @@ int parse_pubkeys(Parser *parser, PubkeysHeader *header, const Pubkey **pubkeys)
     return 0;
 }
 
+int parse_pubkeys_with_len(Parser *parser, size_t num_pubkeys, const Pubkey **pubkeys) {
+    size_t pubkeys_size = num_pubkeys * PUBKEY_SIZE;
+    BAIL_IF(check_buffer_length(parser, pubkeys_size));
+    *pubkeys = (const Pubkey *) parser->buffer;
+    advance(parser, pubkeys_size);
+    return 0;
+}
+
 int parse_hash(Parser *parser, const Hash **hash) {
     BAIL_IF(check_buffer_length(parser, HASH_SIZE));
     *hash = (const Hash *) parser->buffer;
@@ -136,26 +141,43 @@ int parse_version(Parser *parser, MessageHeader *header) {
     return 0;
 }
 
+int parse_offchain_message_application_domain(Parser *parser,
+                                              const OffchainMessageApplicationDomain **app_domain) {
+    BAIL_IF(check_buffer_length(parser, OFFCHAIN_MESSAGE_APPLICATION_DOMAIN_LENGTH));
+    *app_domain = (const OffchainMessageApplicationDomain *) parser->buffer;
+    advance(parser, OFFCHAIN_MESSAGE_APPLICATION_DOMAIN_LENGTH);
+    return 0;
+}
+
 int parse_message_header(Parser *parser, MessageHeader *header) {
     BAIL_IF(parse_version(parser, header));
-    BAIL_IF(parse_pubkeys(parser, &header->pubkeys_header, &header->pubkeys));
+    BAIL_IF(parse_pubkeys_header(parser, &header->pubkeys_header));
+    BAIL_IF(
+        parse_pubkeys_with_len(parser, header->pubkeys_header.pubkeys_length, &header->pubkeys));
     BAIL_IF(parse_blockhash(parser, &header->blockhash));
     BAIL_IF(parse_length(parser, &header->instructions_length));
     return 0;
 }
 
 int parse_offchain_message_header(Parser *parser, OffchainMessageHeader *header) {
-    const size_t domain_len = strlen(OFFCHAIN_MESSAGE_SIGNING_DOMAIN);
+    const size_t domain_len = OFFCHAIN_MESSAGE_SIGNING_DOMAIN_LENGTH;
     BAIL_IF(check_buffer_length(parser, domain_len));
     int res;
-    if ((res = memcmp(OFFCHAIN_MESSAGE_SIGNING_DOMAIN, parser->buffer, domain_len)) != 0) {
+    if ((res =
+             memcmp((const void *) &offchain_message_signing_domain, parser->buffer, domain_len)) !=
+        0) {
         return res;
     }
-    advance(parser, domain_len);
-
-    BAIL_IF(parse_u8(parser, &header->version));
-    BAIL_IF(parse_u8(parser, &header->format));
-    BAIL_IF(parse_u16(parser, &header->length));
+    advance(parser, domain_len);  // Signing domain - 16 bytes
+
+    BAIL_IF(parse_u8(parser, &header->version));  // Header version
+    BAIL_IF(parse_offchain_message_application_domain(parser, &header->application_domain));
+    BAIL_IF(parse_u8(parser, &header->format));  // Message format
+    uint8_t signers_length = 0;
+    BAIL_IF(parse_u8(parser, &signers_length));  // Signer count
+    header->signers_length = signers_length;
+    BAIL_IF(parse_pubkeys_with_len(parser, header->signers_length, &header->signers));
+    BAIL_IF(parse_u16(parser, &header->length));  // Message length
     return 0;
 }
 
diff --git a/libsol/string_utils.c b/libsol/string_utils.c
new file mode 100644
index 00000000..81b6aea9
--- /dev/null
+++ b/libsol/string_utils.c
@@ -0,0 +1,66 @@
+#include "include/sol/string_utils.h"
+
+/**
+ * Checks if data is in UTF-8 format.
+ * Adapted from: https://www.cl.cam.ac.uk/~mgk25/ucs/utf8_check.c
+ */
+bool is_data_utf8(const uint8_t *data, size_t length) {
+    if (!data) {
+        return false;
+    }
+    size_t i = 0;
+    while (i < length) {
+        if (data[i] < 0x80) {
+            /* 0xxxxxxx */
+            ++i;
+        } else if ((data[i] & 0xe0) == 0xc0) {
+            /* 110XXXXx 10xxxxxx */
+            if (i + 1 >= length || (data[i + 1] & 0xc0) != 0x80 ||
+                (data[i] & 0xfe) == 0xc0) /* overlong? */ {
+                return false;
+            } else {
+                i += 2;
+            }
+        } else if ((data[i] & 0xf0) == 0xe0) {
+            /* 1110XXXX 10Xxxxxx 10xxxxxx */
+            if (i + 2 >= length || (data[i + 1] & 0xc0) != 0x80 || (data[i + 2] & 0xc0) != 0x80 ||
+                (data[i] == 0xe0 && (data[i + 1] & 0xe0) == 0x80) || /* overlong? */
+                (data[i] == 0xed && (data[i + 1] & 0xe0) == 0xa0) || /* surrogate? */
+                (data[i] == 0xef && data[i + 1] == 0xbf &&
+                 (data[i + 2] & 0xfe) == 0xbe)) /* U+FFFE or U+FFFF? */ {
+                return false;
+            } else {
+                i += 3;
+            }
+        } else if ((data[i] & 0xf8) == 0xf0) {
+            /* 11110XXX 10XXxxxx 10xxxxxx 10xxxxxx */
+            if (i + 3 >= length || (data[i + 1] & 0xc0) != 0x80 || (data[i + 2] & 0xc0) != 0x80 ||
+                (data[i + 3] & 0xc0) != 0x80 ||
+                (data[i] == 0xf0 && (data[i + 1] & 0xf0) == 0x80) || /* overlong? */
+                (data[i] == 0xf4 && data[i + 1] > 0x8f) || data[i] > 0xf4) /* > U+10FFFF? */ {
+                return false;
+            } else {
+                i += 4;
+            }
+        } else {
+            return false;
+        }
+    }
+    return true;
+}
+
+/*
+ * Checks if data is in ASCII format
+ */
+bool is_data_ascii(const uint8_t *data, size_t length) {
+    if (!data) {
+        return false;
+    }
+    for (size_t i = 0; i < length; ++i) {
+        // Line feed char is accepted
+        if (((data[i] < 0x20 && data[i] != 0x0A) || data[i] > 0x7e)) {
+            return false;
+        }
+    }
+    return true;
+}
diff --git a/libsol/string_utils_test.c b/libsol/string_utils_test.c
new file mode 100644
index 00000000..444207a5
--- /dev/null
+++ b/libsol/string_utils_test.c
@@ -0,0 +1,97 @@
+#include "include/sol/string_utils.h"
+#include <assert.h>
+#include <stdio.h>
+#include <stdbool.h>
+
+void test_is_ascii() {
+    uint8_t message[] = "normal ascii text";
+    //                             don't count 0x00 byte at the end
+    assert(is_data_ascii(message, sizeof(message) - 1) == true);
+}
+
+void test_is_ascii_invalid_end_char() {
+    uint8_t message[] = "normal ascii text";
+
+    // Null terminated string should not be recognized as ascii
+    assert(is_data_ascii(message, sizeof(message)) == false);
+}
+
+void test_is_ascii_invalid_emoji() {
+    uint8_t message[] = "👍";
+
+    assert(is_data_ascii(message, sizeof(message)) == false);
+}
+
+void test_is_ascii_invalid_null() {
+    uint8_t *message = NULL;
+    assert(is_data_ascii(message, sizeof(message)) == false);
+}
+
+// test if emoji is going to be recognized as utf8 string
+void test_is_utf8() {
+    uint8_t message[] = "👍";
+
+    assert(is_data_utf8(message, sizeof(message)) == true);
+}
+
+void test_is_utf8_2() {
+    uint8_t message[] = "żółć 안녕하세요 привет";
+
+    assert(is_data_ascii(message, sizeof(message) - 1) == false);  // And we ignore null terminator
+    assert(is_data_utf8(message, sizeof(message)) == true);
+}
+
+void test_is_utf8_invalid_1() {
+    // Invalid Sequence Identifier
+    uint8_t message[] = {0xa0, 0xa1};
+
+    assert(is_data_utf8(message, sizeof(message)) == false);
+}
+
+void test_is_utf8_invalid_overlong() {
+    // Invalid UTF-8 (overlong)
+    uint8_t message[] = {0xC0, 0xAF};
+    uint8_t message2[] = {0xC0, 0x80};
+
+    assert(is_data_utf8(message, sizeof(message)) == false);
+    assert(is_data_utf8(message2, sizeof(message2)) == false);
+}
+
+void test_is_utf8_invalid_surrogate() {
+    // Invalid UTF-8 (surrogate)
+    uint8_t message[] = {0xED, 0xA0, 0x80};
+
+    assert(is_data_utf8(message, sizeof(message)) == false);
+}
+
+void test_is_utf8_invalid_3() {
+    uint8_t message1[] = {0x80};                    // Invalid UTF-8 (starts with 10xxxxxx)
+    uint8_t message2[] = {0xF4, 0x90, 0x80, 0x80};  // Invalid UTF-8 (> U+10FFFF)
+
+    assert(is_data_utf8(message1, sizeof(message1)) == false);
+    assert(is_data_utf8(message2, sizeof(message2)) == false);
+}
+
+void test_is_utf8_invalid_null() {
+    uint8_t *message = NULL;
+
+    assert(is_data_utf8(message, sizeof(message)) == false);
+}
+
+int main() {
+    test_is_ascii();
+    test_is_ascii_invalid_end_char();
+    test_is_ascii_invalid_emoji();
+    test_is_ascii_invalid_null();
+
+    test_is_utf8();
+    test_is_utf8_2();
+    test_is_utf8_invalid_1();
+    test_is_utf8_invalid_overlong();
+    test_is_utf8_invalid_surrogate();
+    test_is_utf8_invalid_3();
+    test_is_utf8_invalid_null();
+
+    printf("passed\n");
+    return 0;
+}
\ No newline at end of file
diff --git a/libsol/transaction_summary.c b/libsol/transaction_summary.c
index 4edef52b..ad2ae90b 100644
--- a/libsol/transaction_summary.c
+++ b/libsol/transaction_summary.c
@@ -15,6 +15,7 @@ struct SummaryItem {
         const char *string;
         SizedString sized_string;
         TokenAmount token_amount;
+        const OffchainMessageApplicationDomain *application_domain;
     };
 };
 
@@ -79,6 +80,15 @@ void summary_item_set_timestamp(SummaryItem *item, const char *title, int64_t va
     item->i64 = value;
 }
 
+void summary_item_set_offchain_message_application_domain(
+    SummaryItem *item,
+    const char *title,
+    const OffchainMessageApplicationDomain *value) {
+    item->kind = SummaryItemOffchainMessageApplicationDomain;
+    item->title = title;
+    item->application_domain = value;
+}
+
 typedef struct TransactionSummary {
     SummaryItem primary;
     SummaryItem fee_payer;
@@ -197,6 +207,12 @@ static int transaction_summary_update_display_for_item(const SummaryItem *item,
         case SummaryItemTimestamp:
             BAIL_IF(print_timestamp(item->i64, G_transaction_summary_text, TEXT_BUFFER_LENGTH));
             break;
+        case SummaryItemOffchainMessageApplicationDomain:
+            BAIL_IF(encode_base58(item->application_domain,
+                                  OFFCHAIN_MESSAGE_APPLICATION_DOMAIN_LENGTH,
+                                  G_transaction_summary_text,
+                                  TEXT_BUFFER_LENGTH));
+            break;
     }
     print_string(item->title, G_transaction_summary_title, TITLE_SIZE);
     return 0;
diff --git a/src/globals.h b/src/globals.h
index eebf87ff..c39c2829 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -25,16 +25,31 @@
 #define ROUND_TO_NEXT(x, next) (((x) == 0) ? 0 : ((((x - 1) / (next)) + 1) * (next)))
 
 /* See constant by same name in sdk/src/packet.rs */
-#define PACKET_DATA_SIZE (1280 - 40 - 8)
+// Packet data size increased to allow handling bigger messages (OCMS)
+#define PACKET_DATA_SIZE ((15 * 1024) - 40 - 8)
 
 #define MAX_BIP32_PATH_LENGTH             5
 #define MAX_DERIVATION_PATH_BUFFER_LENGTH (1 + MAX_BIP32_PATH_LENGTH * 4)
 #define TOTAL_SIGN_MESSAGE_BUFFER_LENGTH  (PACKET_DATA_SIZE + MAX_DERIVATION_PATH_BUFFER_LENGTH)
 
+#define MAX_OFFCHAIN_MESSAGE_LENGTH PACKET_DATA_SIZE
+
+// Assuming that only one signer
+#define OFFCHAIN_MESSAGE_HEADER_LENGTH 85
+
+// Application buffer - no content reference value
+#define OFFCHAIN_EMPTY_APPLICATION_DOMAIN                                                         \
+    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,     \
+        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, \
+        0x00, 0x00
+
 #define MAX_MESSAGE_LENGTH ROUND_TO_NEXT(TOTAL_SIGN_MESSAGE_BUFFER_LENGTH, USB_SEGMENT_SIZE)
 
-#define MAX_OFFCHAIN_MESSAGE_LENGTH    (MAX_MESSAGE_LENGTH - 1 > 1212 ? 1212 : MAX_MESSAGE_LENGTH - 1)
-#define OFFCHAIN_MESSAGE_HEADER_LENGTH 20
+// credit: https://stackoverflow.com/questions/807244/c-compiler-asserts-how-to-implement
+#define CASSERT(predicate, file) _impl_CASSERT_LINE(predicate, __LINE__, file)
+#define _impl_PASTE(a, b)        a##b
+#define _impl_CASSERT_LINE(predicate, line, file) \
+    typedef char _impl_PASTE(assertion_failed_##file##_, line)[2 * !!(predicate) -1];
 
 typedef enum InstructionCode {
     // DEPRECATED - Use non "16" suffixed variants below
diff --git a/src/handle_sign_message.c b/src/handle_sign_message.c
index d8d9cd2c..ff199a1f 100644
--- a/src/handle_sign_message.c
+++ b/src/handle_sign_message.c
@@ -17,16 +17,12 @@ static int scan_header_for_signer(const uint32_t *derivation_path,
                                   uint32_t derivation_path_length,
                                   size_t *signer_index,
                                   const MessageHeader *header) {
-    uint8_t signer_pubkey[PUBKEY_SIZE];
-    get_public_key(signer_pubkey, derivation_path, derivation_path_length);
-    for (size_t i = 0; i < header->pubkeys_header.num_required_signatures; ++i) {
-        const Pubkey *current_pubkey = &(header->pubkeys[i]);
-        if (memcmp(current_pubkey, signer_pubkey, PUBKEY_SIZE) == 0) {
-            *signer_index = i;
-            return 0;
-        }
-    }
-    return -1;
+    Pubkey signer_pubkey;
+    get_public_key(signer_pubkey.data, derivation_path, derivation_path_length);
+    return get_pubkey_index(&signer_pubkey,
+                            header->pubkeys,
+                            header->pubkeys_header.num_required_signatures,
+                            signer_index);
 }
 
 void handle_sign_message_parse_message(volatile unsigned int *tx) {
diff --git a/src/handle_sign_offchain_message.c b/src/handle_sign_offchain_message.c
index dc0a743b..8f18517b 100644
--- a/src/handle_sign_offchain_message.c
+++ b/src/handle_sign_offchain_message.c
@@ -3,85 +3,73 @@
 #include "ux.h"
 #include "cx.h"
 #include "utils.h"
+#include "sol/string_utils.h"
 #include "sol/parser.h"
-#include "sol/printer.h"
-#include "sol/print_config.h"
-#include "sol/message.h"
 #include "sol/transaction_summary.h"
 #include "globals.h"
 #include "apdu.h"
 #include "handle_sign_offchain_message.h"
 #include "ui_api.h"
 
-// Store locally the derived public key content
-static Pubkey G_publicKey;
+// ensure the command buffer has space to append a NUL terminal
+CASSERT(MAX_OFFCHAIN_MESSAGE_LENGTH < MAX_MESSAGE_LENGTH, global_h);
 
-/**
- * Checks if data is in UTF-8 format.
- * Adapted from: https://www.cl.cam.ac.uk/~mgk25/ucs/utf8_check.c
- */
-static bool is_data_utf8(const uint8_t *data, size_t length) {
-    if (!data) {
-        return false;
+// To reduce unnecessary
+// preprocessor directives and keep the function cleaner, i explicitly suppress
+// warnings about unused `parser`.
+void ui_general(OffchainMessageHeader *header,
+                bool is_ascii,
+                Parser *parser __attribute__((unused))) {
+    const uint8_t empty_application_domain[OFFCHAIN_MESSAGE_APPLICATION_DOMAIN_LENGTH] = {
+        OFFCHAIN_EMPTY_APPLICATION_DOMAIN};
+    // Check if application domain buffer contains only zeroes
+    SummaryItem *item = transaction_summary_general_item();
+    if (memcmp(header->application_domain,
+               empty_application_domain,
+               OFFCHAIN_MESSAGE_APPLICATION_DOMAIN_LENGTH) == 0) {
+        // Application buffer contains only zeroes - displaying base58 encoded string not needed
+        summary_item_set_string(item, "Application", "Domain not provided");
+    } else {
+        summary_item_set_offchain_message_application_domain(item,
+                                                             "Application",
+                                                             header->application_domain);
     }
-    size_t i = 0;
-    while (i < length) {
-        if (data[i] < 0x80) {
-            /* 0xxxxxxx */
-            ++i;
-        } else if ((data[i] & 0xe0) == 0xc0) {
-            /* 110XXXXx 10xxxxxx */
-            if (i + 1 >= length || (data[i + 1] & 0xc0) != 0x80 ||
-                (data[i] & 0xfe) == 0xc0) /* overlong? */ {
-                return false;
-            } else {
-                i += 2;
-            }
-        } else if ((data[i] & 0xf0) == 0xe0) {
-            /* 1110XXXX 10Xxxxxx 10xxxxxx */
-            if (i + 2 >= length || (data[i + 1] & 0xc0) != 0x80 || (data[i + 2] & 0xc0) != 0x80 ||
-                (data[i] == 0xe0 && (data[i + 1] & 0xe0) == 0x80) || /* overlong? */
-                (data[i] == 0xed && (data[i + 1] & 0xe0) == 0xa0) || /* surrogate? */
-                (data[i] == 0xef && data[i + 1] == 0xbf &&
-                 (data[i + 2] & 0xfe) == 0xbe)) /* U+FFFE or U+FFFF? */ {
-                return false;
-            } else {
-                i += 3;
-            }
-        } else if ((data[i] & 0xf8) == 0xf0) {
-            /* 11110XXX 10XXxxxx 10xxxxxx 10xxxxxx */
-            if (i + 3 >= length || (data[i + 1] & 0xc0) != 0x80 || (data[i + 2] & 0xc0) != 0x80 ||
-                (data[i + 3] & 0xc0) != 0x80 ||
-                (data[i] == 0xf0 && (data[i + 1] & 0xf0) == 0x80) || /* overlong? */
-                (data[i] == 0xf4 && data[i + 1] > 0x8f) || data[i] > 0xf4) /* > U+10FFFF? */ {
-                return false;
-            } else {
-                i += 4;
-            }
-        } else {
-            return false;
-        }
+
+    if (N_storage.settings.display_mode == DisplayModeExpert) {
+        summary_item_set_u64(transaction_summary_general_item(), "Version", header->version);
+        summary_item_set_u64(transaction_summary_general_item(), "Format", header->format);
+        summary_item_set_u64(transaction_summary_general_item(), "Size", header->length);
+        summary_item_set_hash(transaction_summary_general_item(), "Hash", &G_command.message_hash);
+    } else if (!is_ascii) {
+        summary_item_set_hash(transaction_summary_general_item(), "Hash", &G_command.message_hash);
     }
-    return true;
 }
 
-/*
- * Checks if data is in ASCII format
- */
-static bool is_data_ascii(const uint8_t *data, size_t length) {
-    if (!data) {
-        return false;
+void setup_ui(OffchainMessageHeader *header, bool is_ascii, Parser *parser, size_t signer_index) {
+    // fill out UI steps
+    transaction_summary_reset();
+    SummaryItem *item = transaction_summary_primary_item();
+    summary_item_set_string(item, "Sign", "Off-Chain Message");
+
+    item = transaction_summary_fee_payer_item();
+    // First signer
+    summary_item_set_pubkey(item, "Signer", &header->signers[signer_index]);
+
+    if (header->signers_length > 1) {
+        item = transaction_summary_general_item();
+        summary_item_set_u64(item, "Other signers", header->signers_length);
     }
-    for (size_t i = 0; i < length; ++i) {
-        if (data[i] < 0x20 || data[i] > 0x7e) {
-            return false;
-        }
+
+    ui_general(header, is_ascii, parser);
+
+    enum SummaryItemKind summary_step_kinds[MAX_TRANSACTION_SUMMARY_ITEMS];
+    size_t num_summary_steps = 0;
+    if (transaction_summary_finalize(summary_step_kinds, &num_summary_steps)) {
+        THROW(ApduReplySolanaSummaryFinalizeFailed);
     }
-    return true;
+    start_sign_offchain_message_ui(is_ascii, num_summary_steps);
 }
 
-//////////////////////////////////////////////////////////////////////
-
 void handle_sign_offchain_message(volatile unsigned int *flags, volatile unsigned int *tx) {
     if (!tx || G_command.instruction != InsSignOffchainMessage ||
         G_command.state != ApduStatePayloadComplete) {
@@ -96,63 +84,53 @@ void handle_sign_offchain_message(volatile unsigned int *flags, volatile unsigne
         THROW(ApduReplySdkNotSupported);
     }
 
+    if (G_command.message_length > MAX_OFFCHAIN_MESSAGE_LENGTH) {
+        THROW(ApduReplySolanaInvalidMessageSize);
+    }
+
     // parse header
     Parser parser = {G_command.message, G_command.message_length};
     OffchainMessageHeader header;
+    Pubkey public_key;
+
     if (parse_offchain_message_header(&parser, &header)) {
         THROW(ApduReplySolanaInvalidMessageHeader);
     }
 
     // validate message
-    if (header.version != 0 || header.format > 1 || header.length > MAX_OFFCHAIN_MESSAGE_LENGTH ||
-        header.length + OFFCHAIN_MESSAGE_HEADER_LENGTH != G_command.message_length) {
+    if (header.version != 0 || header.format > 1 || header.length == 0 ||
+        header.length != parser.buffer_length || header.signers_length == 0) {
+        THROW(ApduReplySolanaInvalidMessageHeader);
+    }
+
+    get_public_key(public_key.data, G_command.derivation_path, G_command.derivation_path_length);
+
+    // assert that the requested signer exists in the signers list
+    size_t signer_index;
+    if (get_pubkey_index(&public_key, header.signers, header.signers_length, &signer_index) != 0) {
         THROW(ApduReplySolanaInvalidMessageHeader);
     }
-    const bool is_ascii =
-        is_data_ascii(G_command.message + OFFCHAIN_MESSAGE_HEADER_LENGTH, header.length);
-    const bool is_utf8 =
-        is_ascii ? true
-                 : is_data_utf8(G_command.message + OFFCHAIN_MESSAGE_HEADER_LENGTH, header.length);
-    if (!is_ascii && (!is_utf8 || header.format == 0)) {
+
+    const bool is_ascii = is_data_ascii(parser.buffer, parser.buffer_length);
+    const bool is_utf8 = is_ascii ? true : is_data_utf8(parser.buffer, parser.buffer_length);
+
+    if ((!is_ascii && header.format != 1) || !is_utf8) {
+        // Message has invalid header version or is not valid utf8 string
         THROW(ApduReplySolanaInvalidMessageFormat);
     } else if (!is_ascii && N_storage.settings.allow_blind_sign != BlindSignEnabled) {
+        // UTF-8 messages are allowed only with blind sign enabled
         THROW(ApduReplySdkNotSupported);
     }
 
     // compute message hash if needed
     if (!is_ascii || N_storage.settings.display_mode == DisplayModeExpert) {
-        cx_hash_sha256(G_command.message,
-                       G_command.message_length,
+        cx_hash_sha256(parser.buffer,  // Only message content is hashed
+                       header.length,
                        (uint8_t *) &G_command.message_hash,
                        HASH_LENGTH);
     }
 
-    // fill out UX steps
-    transaction_summary_reset();
-    SummaryItem *item = transaction_summary_primary_item();
-    summary_item_set_string(item, "Sign", "Off-Chain Message");
-
-    if (N_storage.settings.display_mode == DisplayModeExpert) {
-        summary_item_set_u64(transaction_summary_general_item(), "Version", header.version);
-        summary_item_set_u64(transaction_summary_general_item(), "Format", header.format);
-        summary_item_set_u64(transaction_summary_general_item(), "Size", header.length);
-        summary_item_set_hash(transaction_summary_general_item(), "Hash", &G_command.message_hash);
-
-        get_public_key(G_publicKey.data,
-                       G_command.derivation_path,
-                       G_command.derivation_path_length);
-        summary_item_set_pubkey(transaction_summary_general_item(), "Signer", &G_publicKey);
-    } else if (!is_ascii) {
-        summary_item_set_hash(transaction_summary_general_item(), "Hash", &G_command.message_hash);
-    }
-
-    enum SummaryItemKind summary_step_kinds[MAX_TRANSACTION_SUMMARY_ITEMS];
-    size_t num_summary_steps = 0;
-    if (transaction_summary_finalize(summary_step_kinds, &num_summary_steps)) {
-        THROW(ApduReplySolanaSummaryFinalizeFailed);
-    }
-
-    start_sign_offchain_message_ui(is_ascii, num_summary_steps);
+    setup_ui(&header, is_ascii, &parser, signer_index);
 
     *flags |= IO_ASYNCH_REPLY;
-}
+}
\ No newline at end of file
diff --git a/src/ui/sign_message_bagl.c b/src/ui/sign_message_bagl.c
index 0fb4e126..f6335c7b 100644
--- a/src/ui/sign_message_bagl.c
+++ b/src/ui/sign_message_bagl.c
@@ -112,5 +112,4 @@ void start_sign_offchain_message_ui(bool is_ascii, size_t num_summary_steps) {
 
     ux_flow_init(0, flow_steps, NULL);
 }
-
 #endif
diff --git a/src/utils.c b/src/utils.c
index 234bcd04..57c74555 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -35,6 +35,20 @@ void get_public_key(uint8_t publicKeyArray[static PUBKEY_LENGTH],
     }
 }
 
+int get_pubkey_index(const Pubkey *needle,
+                     const Pubkey *haystack,
+                     size_t haystack_len,
+                     size_t *index) {
+    for (size_t i = 0; i < haystack_len; ++i) {
+        const Pubkey *current_pubkey = &(haystack[i]);
+        if (memcmp(current_pubkey, needle, PUBKEY_SIZE) == 0) {
+            *index = i;
+            return 0;
+        }
+    }
+    return -1;
+}
+
 int read_derivation_path(const uint8_t *data_buffer,
                          size_t data_size,
                          uint32_t *derivation_path,
diff --git a/src/utils.h b/src/utils.h
index 4ed3bdb8..0763a619 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -26,6 +26,11 @@ void get_public_key(uint8_t publicKeyArray[static PUBKEY_LENGTH],
                     const uint32_t *derivationPath,
                     size_t pathLength);
 
+int get_pubkey_index(const Pubkey *needle,
+                     const Pubkey *haystack,
+                     size_t haystack_len,
+                     size_t *index);
+
 /**
  * Deserialize derivation path from raw bytes.
  *
@@ -59,9 +64,8 @@ uint8_t set_result_sign_message(void);
     } while (0)
 #define PRINTF(msg, arg) printf(msg, arg)
 #define PIC(code)        code
-//#define TARGET_NANOS 1
-#define TARGET_BLUE    1
-#define MEMCLEAR(dest) explicit_bzero(&dest, sizeof(dest));
+#define TARGET_BLUE      1
+#define MEMCLEAR(dest)   explicit_bzero(&dest, sizeof(dest));
 #else
 #define MEMCLEAR(dest)                       \
     do {                                     \
diff --git a/tests/python/apps/solana.py b/tests/python/apps/solana.py
index 600204b5..e79af8f6 100644
--- a/tests/python/apps/solana.py
+++ b/tests/python/apps/solana.py
@@ -67,6 +67,7 @@ class ErrorType:
     SOLANA_SUMMARY_UPDATE_FAILED = 0x6f01
     UNIMPLEMENTED_INSTRUCTION = 0x6d00
     INVALID_CLA = 0x6e00
+    SOLANA_INVALID_MESSAGE_SIZE = 0x6a83
 
 
 def _extend_and_serialize_multiple_derivations_paths(derivations_paths: List[bytes]):
diff --git a/tests/python/apps/solana_cmd_builder.py b/tests/python/apps/solana_cmd_builder.py
index 8c0e1a39..44aa09bb 100644
--- a/tests/python/apps/solana_cmd_builder.py
+++ b/tests/python/apps/solana_cmd_builder.py
@@ -150,23 +150,24 @@ class MessageFormat(IntEnum):
 class v0_OffchainMessage:
     format: MessageFormat
     message: bytes
+    signer_pubkey: bytes
 
-    def __init__(self, message: bytes):
+    def __init__(self, message: bytes, signer_pubkey: bytes):
         # /// Construct a new OffchainMessage object from the given message
-        if len(message) <= MAX_LEN_LEDGER:
-            if is_printable_ascii(message):
-                self.format = MessageFormat.RestrictedAscii
-            elif is_utf8(message):
-                self.format = MessageFormat.LimitedUtf8
-            else:
-                raise ValueError()
-        elif len(message) <= MAX_LEN:
+        if is_printable_ascii(message):
+            self.format = MessageFormat.RestrictedAscii
+        elif is_utf8(message):
+            self.format = MessageFormat.LimitedUtf8
+        else:
+            raise ValueError()
+
+        if len(message) <= MAX_LEN:
             if is_utf8(message):
                 self.format = MessageFormat.ExtendedUtf8
             else:
                 raise ValueError()
-        else:
-            raise ValueError()
+        
+        self.signer_pubkey = signer_pubkey
         self.message = message
 
     # Serialize the message to bytes, including the full header
@@ -175,6 +176,10 @@ def serialize(self) -> bytes:
         data: bytes = b""
         # format
         data += self.format.to_bytes(1, byteorder='little')
+        # signers count
+        data += (1).to_bytes(1, byteorder='little')
+        # signers
+        data += self.signer_pubkey
         # message length
         data += len(self.message).to_bytes(2, byteorder='little')
         # message
@@ -185,22 +190,29 @@ def serialize(self) -> bytes:
 class OffchainMessage:
     version: int
     message: v0_OffchainMessage
+    app_domain: bytes
 
     # Construct a new OffchainMessage object from the given version and message
-    def __init__(self, version: int, message: bytes):
+    def __init__(self, version: int, message: bytes, signer_pubkey: bytes, app_domain: bytes=b""):
         self.version = version
+        # Ensure app_domain is exactly 32 bytes, pad with zeros if necessary
+        self.app_domain = app_domain.ljust(32, b'\x00')[:32]
+        
         if version == 0:
-            self.message = v0_OffchainMessage(message)
+            self.message = v0_OffchainMessage(message, signer_pubkey)
         else:
-            raise ValueError()
+            raise ValueError("Unsupported version")
 
     # Serialize the off-chain message to bytes including full header
     def serialize(self) -> bytes:
         data: bytes = b""
-        # serialize signing domain
+        # Serialize signing domain
         data += SIGNING_DOMAIN
-
-        # serialize version and call version specific serializer
+        # Serialize version
         data += self.version.to_bytes(1, byteorder='little')
+        # Include padded app_domain
+        data += self.app_domain
+        # Serialize message
         data += self.message.serialize()
         return data
+
diff --git a/tests/python/apps/solana_utils.py b/tests/python/apps/solana_utils.py
index 7f462283..a0fafdd9 100644
--- a/tests/python/apps/solana_utils.py
+++ b/tests/python/apps/solana_utils.py
@@ -117,3 +117,8 @@ def enable_expert_mode(navigator, firmware, snapshots_name: str):
                                    snapshots_name,
                                    nav,
                                    screen_change_before_first_instruction=False)
+
+
+LONG_VALID_UTF8 = 'PkOPx7dIJoS$fdJՄIܠbAѭ|/.cRm<u6ۙʊWA;ۨ}/o?yA@NޯFjW̵2[ɽ֎Xd71֞tV6}͉FH@,3U:\\̇ړZkѪΏb(mVHHׇހ|HLjƒ\'0SUqٿ)#)P79SVd>\u05fcI``ŝ*!Nѭmƚ]8Ļ]3rgтRwFRHË[UvKb[܊&Rs%1N˟N֊6l_MX%*ֿst*ic]{Rc`ݑdT!.ƅ)4_ڦZ;%ܐ|>ӟV1ʵҴi>FU"\\װ@KPԖ<=-~ΦZEζ1ϥd-!8Sj4P,FA7Se"BK4y?܀w=V%AٰɩBʩ5OWΊLiz"5HɚױؙVy^սhJU|&;:e\'`e[26Zdh6Wاj]kCZ|ѿIĚDE"3iQKu.n[Ĺl0_&ԏf:i~\\^5Աb@z#A7>Ztf8Ԯޅs[&zѢ/y\'uS(VS߉!J$<#}+(Бs6kMwY;ܜgvJс!ʌ$q\u05caPjJuŗafx&mxy12=0~(#IKkF:4$jKϤTQ͙\\ՖSRJdfDs1qa3`3P?p+8 R40ӀF,η%͝{0V˜֜W&e`GN[.f1wBK\u074bYOJG^ˇ0ԓ\\&0=,ܴ Ѡmՙ9\u058cڮm+yuqɅI7\\aoK֢H*s<YhЎ~5ФFm0Q:?=?Ƨw^mȏ9Ƙޥ-=:D8V,v-˷~;%{~|zq(ocRRܶԟ23֞nYW?Hj2e6cޫe/cl~%!WEWՐpg_jޒV˲J|,ԓs=D6ǚĔ;0Csj]w߳kcőL43ݑr,ϫպ=y0=+A-Br#=[iȊݾbV.w*ȅ<vLfɔ78ínvWU\u07fcS,H˺ZVwFnԼ˭Z_nx߄o):;9L3ߡYbե*Sʀi+p}7l$!ǽ6{ָGC*Fa;ĢB [(aT\\m`$&Pqe=Qʟ܍\'XPȚ@4!ŻUfuay"L=YKν3S#`%hx4yCZJY\'Kvga|\'/ի}_g-zƍ0C;VTxgo?fϕѣ=ts:^oŗʹθq[s81U"D7kʳ ?yU \u05fb&5ӂv8V}ߺr4cDdۯ"R5[Ӈto-fO÷ӳpܥRVCƹX҇УҡΪVߙiCb7ەxr,ϘLƊKiGy@e/g:&ޔnK[y`qMs3\' <S+H`کѳI>ٺ("Tred̮ax-Q=P>`N]qLg?O֪ĞDKZJֶgwҦɹT>qX fݏj`gȗc,8>D5VjГÌլ%zL\\{k̶pLsn$I%ʃXY{[)B2Y"]ȃ2Ȱ:~|K_m]ãԵa5Hħz!yN;*ܫك`ЯmRҰBwhFDڀV?SÄri\\z(]ì=ۮpIc{t͍1Ia,أIpRqLi]d֧Yp9?PRbq>\xad2rM)ȠUʹ(fN%םrؓ@wqQπ-!~1нv گ:xnj$}>ԛulwŲaZeSϰO\u07bcsÆF˩N4;OC>yvi§(]ffJJXd0݉ȵ6Cv-tϧN o[gP#Xh-bݠgh\u05ebo.:&Yjd-oڛ{KYץ2<b\\ҝȓA?mBa¸a2%CdANԇ(Ȅ]tin,=DV7+ZBڮԜ<t7ӆO)I6<̥glI6Ɓc/G:^ĵyف\u07ba9Lƿ_7D6̦u#lKӾGǺ)Oz-֕LA<ϓ (\\ƦЇl״Q<״EjcUJ{QLaz[Ԣ9Sٱ̬i_Tdfpw§ȿڐ+Y$hF3;ڞ^IȴWWLȃSֳ!.HЗ"j y@ĩm\\!9QQJJrA<uO"gYD`pϸPD;wbcv0ȆnvP>X{ݎko&SÅbμc5q;dogߙUUMfg$ՙƵ8zr3uݦG̱ԱKڃ9]\\пhhGTUx<|1~βLmy(K؟(ÁqT:ɓʸzcmzDi:ךp2Q+ōLfqvӬ3ڔȗ[Io\\ln##-FgבFFa6.*"7ezQXJSvۈ)Ԡp֤Oq}QlBv|s<7;qD>&tƬ݊-Gй߰w/5юt)\u06ddq-9faϱ#v7T>5ej΄#f&554HZe?TeͤOŁСu&BT/VNɝ͐9=)Sʆer0b3zuȱQ7m5yEŅЭlj&xwWFӓ,dGYd),ܗ=KS*ڞKQԳΑ%>آ\'jOqȎfe@ZN?0ˋOMaآTϝZظIܿ5ZѿGΦ\\_%>]1XAM}͌TơӬТנX׆X<\\T~Թ\u05c9itsy?I%WnVYqQO]Xźܙڟ!çԗH<9] ̋fp͘\\-aj.9c&.nQ%C5bE:1ƌÀƉC$HH1bHK&m6 Ë"HB!:?4L_CwAWALˍ.E˯osۣY79_5Wd1$Awع%ӃhȓaLs0<LVIѵLUipHםbIJɪasE?`p0WN{ɬkT܈ڐл9ƵXĩ}d1ɑGɗ@rQ&&[@ѡΌƟxJrV ~y֙}Qػ;m& 1+}JMٰNU:ֈ\u05ffd/*$GTruٝ(c̵̿\\k@)OVu[8mOKt4֏Y7t*È9}/ٗȮPlIʳ:/Ͱa5ŧüKd%:-@<M)eJ2P,X#(#M\')է(98D<?ߧ9DՋOƆo$WXP_S3=VN>Qfrvf;-ŊͲ0BEQ%0(qh]"#"Z]pAҪZF9ȃ؊LVlɽ.jc ?\'xWɅ\\" w^Bώ͔RSʧǬ[|S٫̕ݖ-,}ֲ}֕m74R?m>>kGֱW:КnQF24ƦvUm,8˔_ا)hؿ*tahkו66͵ܢ٘ܲŢ)U(*A̶(ѬofVhЪ:eJ+pdO<p_̢AEUw\\7q%216O¾˱+s؇*;4*:.s$v§t4719Ue5Ť4ϰ#=՜ѹiGj? 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+
+LONG_VALID_ASCII = b'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'
\ No newline at end of file
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diff --git a/tests/python/test_solana.py b/tests/python/test_solana.py
index e48895ea..1d5d679f 100644
--- a/tests/python/test_solana.py
+++ b/tests/python/test_solana.py
@@ -1,11 +1,14 @@
 from ragger.backend import RaisePolicy
 from ragger.utils import RAPDU
+from ragger.error import ExceptionRAPDU
 
 from .apps.solana import SolanaClient, ErrorType
 from .apps.solana_cmd_builder import SystemInstructionTransfer, Message, verify_signature, OffchainMessage
 from .apps.solana_utils import FOREIGN_PUBLIC_KEY, FOREIGN_PUBLIC_KEY_2, AMOUNT, AMOUNT_2, SOL_PACKED_DERIVATION_PATH, SOL_PACKED_DERIVATION_PATH_2, ROOT_SCREENSHOT_PATH
-from .apps.solana_utils import enable_blind_signing, enable_expert_mode
+from .apps.solana_utils import enable_blind_signing, enable_expert_mode, LONG_VALID_ASCII, LONG_VALID_UTF8
 
+import random
+import string
 
 class TestGetPublicKey:
 
@@ -81,7 +84,21 @@ def test_ledger_sign_offchain_message_ascii_ok(self, backend, scenario_navigator
         sol = SolanaClient(backend)
         from_public_key = sol.get_public_key(SOL_PACKED_DERIVATION_PATH)
 
-        offchain_message: OffchainMessage = OffchainMessage(0, b"Test message")
+        offchain_message: OffchainMessage = OffchainMessage(0, b"Test message", from_public_key)
+        message: bytes = offchain_message.serialize()
+
+        with sol.send_async_sign_offchain_message(SOL_PACKED_DERIVATION_PATH, message):
+            scenario_navigator.review_approve(path=ROOT_SCREENSHOT_PATH)
+
+        signature: bytes = sol.get_async_response().data
+        verify_signature(from_public_key, message, signature)
+
+
+    def test_ledger_sign_offchain_very_long_message_ascii_ok(self, backend, scenario_navigator):
+        sol = SolanaClient(backend)
+        from_public_key = sol.get_public_key(SOL_PACKED_DERIVATION_PATH)
+        
+        offchain_message: OffchainMessage = OffchainMessage(0, LONG_VALID_ASCII, from_public_key)
         message: bytes = offchain_message.serialize()
 
         with sol.send_async_sign_offchain_message(SOL_PACKED_DERIVATION_PATH, message):
@@ -94,7 +111,8 @@ def test_ledger_sign_offchain_message_ascii_ok(self, backend, scenario_navigator
     def test_ledger_sign_offchain_message_ascii_refused(self, backend, scenario_navigator):
         sol = SolanaClient(backend)
 
-        offchain_message: OffchainMessage = OffchainMessage(0, b"Test message")
+        from_public_key = sol.get_public_key(SOL_PACKED_DERIVATION_PATH)
+        offchain_message: OffchainMessage = OffchainMessage(0, b"Test message", from_public_key)
         message: bytes = offchain_message.serialize()
 
         backend.raise_policy = RaisePolicy.RAISE_NOTHING
@@ -104,6 +122,23 @@ def test_ledger_sign_offchain_message_ascii_refused(self, backend, scenario_navi
         rapdu: RAPDU = sol.get_async_response()
         assert rapdu.status == ErrorType.USER_CANCEL
 
+    def test_ledger_sign_offchain_message_ascii_message_too_long(self, backend, scenario_navigator):
+        sol = SolanaClient(backend)
+        from_public_key = sol.get_public_key(SOL_PACKED_DERIVATION_PATH)
+
+        INVALID_LONG_MESSAGE = ''.join(random.choices(string.ascii_letters, k=32*1024))
+        INVALID_LONG_MESSAGE = INVALID_LONG_MESSAGE.encode("ascii")
+        
+        offchain_message: OffchainMessage = OffchainMessage(0, INVALID_LONG_MESSAGE, from_public_key)
+        message: bytes = offchain_message.serialize()
+
+        try:
+            with sol.send_async_sign_offchain_message(SOL_PACKED_DERIVATION_PATH, message):
+                pass
+            assert False, "Ledger accepted too long message"
+        except ExceptionRAPDU as e:
+            assert e.status == ErrorType.SOLANA_INVALID_MESSAGE_SIZE
+
 
     def test_ledger_sign_offchain_message_ascii_expert_ok(self, backend, scenario_navigator, navigator, test_name):
         enable_expert_mode(navigator, backend.firmware, test_name + "_1")
@@ -111,7 +146,7 @@ def test_ledger_sign_offchain_message_ascii_expert_ok(self, backend, scenario_na
         sol = SolanaClient(backend)
         from_public_key = sol.get_public_key(SOL_PACKED_DERIVATION_PATH)
 
-        offchain_message: OffchainMessage = OffchainMessage(0, b"Test message")
+        offchain_message: OffchainMessage = OffchainMessage(0, b"Test message", from_public_key)
         message: bytes = offchain_message.serialize()
 
         with sol.send_async_sign_offchain_message(SOL_PACKED_DERIVATION_PATH, message):
@@ -125,8 +160,9 @@ def test_ledger_sign_offchain_message_ascii_expert_refused(self, backend, scenar
         enable_expert_mode(navigator, backend.firmware, test_name + "_1")
 
         sol = SolanaClient(backend)
+        from_public_key = sol.get_public_key(SOL_PACKED_DERIVATION_PATH)
 
-        offchain_message: OffchainMessage = OffchainMessage(0, b"Test message")
+        offchain_message: OffchainMessage = OffchainMessage(0, b"Test message",from_public_key)
         message: bytes = offchain_message.serialize()
 
         backend.raise_policy = RaisePolicy.RAISE_NOTHING
@@ -143,7 +179,63 @@ def test_ledger_sign_offchain_message_utf8_ok(self, backend, scenario_navigator,
         sol = SolanaClient(backend)
         from_public_key = sol.get_public_key(SOL_PACKED_DERIVATION_PATH)
 
-        offchain_message: OffchainMessage = OffchainMessage(0, bytes("Тестовое сообщение", 'utf-8'))
+        offchain_message: OffchainMessage = OffchainMessage(0, bytes("Тестовое сообщение", 'utf-8'), from_public_key)
+        message: bytes = offchain_message.serialize()
+
+        with sol.send_async_sign_offchain_message(SOL_PACKED_DERIVATION_PATH, message):
+            scenario_navigator.review_approve(path=ROOT_SCREENSHOT_PATH, test_name=test_name + "_2")
+
+        signature: bytes = sol.get_async_response().data
+        verify_signature(from_public_key, message, signature)
+
+
+    def test_ledger_sign_offchain_very_long_message_utf8_ok(self, backend, scenario_navigator, navigator, test_name):
+        enable_blind_signing(navigator, backend.firmware, test_name + "_1")
+
+        sol = SolanaClient(backend)
+        from_public_key = sol.get_public_key(SOL_PACKED_DERIVATION_PATH)
+
+        # Decode to a UTF-8 string, ignoring invalid characters
+        VALID_LONG_MESSAGE = LONG_VALID_UTF8.encode("utf-8")
+
+        offchain_message: OffchainMessage = OffchainMessage(0, VALID_LONG_MESSAGE, from_public_key)
+        message: bytes = offchain_message.serialize()
+
+        with sol.send_async_sign_offchain_message(SOL_PACKED_DERIVATION_PATH, message):
+            scenario_navigator.review_approve(path=ROOT_SCREENSHOT_PATH, test_name=test_name + "_2")
+
+        signature: bytes = sol.get_async_response().data
+        verify_signature(from_public_key, message, signature)
+
+
+    def test_ledger_sign_offchain_message_utf8_message_too_long(self, backend, scenario_navigator):
+        sol = SolanaClient(backend)
+        from_public_key = sol.get_public_key(SOL_PACKED_DERIVATION_PATH)
+
+        # Generate 2048 random bytes
+        random_bytes = bytes(random.randint(0, 255) for _ in range(32*1024))
+
+        # Decode to a UTF-8 string, ignoring invalid characters
+        INVALID_LONG_MESSAGE = random_bytes.decode("utf-8", errors="ignore").encode("utf-8")
+
+        offchain_message: OffchainMessage = OffchainMessage(0, INVALID_LONG_MESSAGE, from_public_key)
+        message: bytes = offchain_message.serialize()
+
+        try:
+            with sol.send_async_sign_offchain_message(SOL_PACKED_DERIVATION_PATH, message):
+                pass
+            assert False, "Ledger accepted too long message"
+        except ExceptionRAPDU as e:
+            assert e.status == ErrorType.SOLANA_INVALID_MESSAGE_SIZE
+
+
+    def test_ledger_sign_offchain_message_with_app_domain_utf8_ok(self, backend, scenario_navigator, navigator, test_name):
+        enable_blind_signing(navigator, backend.firmware, test_name + "_1")
+
+        sol = SolanaClient(backend)
+        from_public_key = sol.get_public_key(SOL_PACKED_DERIVATION_PATH)
+
+        offchain_message: OffchainMessage = OffchainMessage(0, bytes("Tęśtową wiądómóścią", 'utf-8'), from_public_key, b"My Candy App")
         message: bytes = offchain_message.serialize()
 
         with sol.send_async_sign_offchain_message(SOL_PACKED_DERIVATION_PATH, message):
@@ -157,8 +249,9 @@ def test_ledger_sign_offchain_message_utf8_refused(self, backend, scenario_navig
         enable_blind_signing(navigator, backend.firmware, test_name + "_1")
 
         sol = SolanaClient(backend)
+        from_public_key = sol.get_public_key(SOL_PACKED_DERIVATION_PATH)
 
-        offchain_message: OffchainMessage = OffchainMessage(0, bytes("Тестовое сообщение", 'utf-8'))
+        offchain_message: OffchainMessage = OffchainMessage(0, bytes("Тестовое сообщение", 'utf-8'), from_public_key)
         message: bytes = offchain_message.serialize()
 
         backend.raise_policy = RaisePolicy.RAISE_NOTHING
@@ -176,7 +269,7 @@ def test_ledger_sign_offchain_message_utf8_expert_ok(self, backend, scenario_nav
         sol = SolanaClient(backend)
         from_public_key = sol.get_public_key(SOL_PACKED_DERIVATION_PATH)
 
-        offchain_message: OffchainMessage = OffchainMessage(0, bytes("Тестовое сообщение", 'utf-8'))
+        offchain_message: OffchainMessage = OffchainMessage(0, bytes("Тестовое сообщение", 'utf-8'), from_public_key)
         message: bytes = offchain_message.serialize()
 
         with sol.send_async_sign_offchain_message(SOL_PACKED_DERIVATION_PATH, message):
@@ -191,8 +284,9 @@ def test_ledger_sign_offchain_message_utf8_expert_refused(self, backend, scenari
         enable_expert_mode(navigator, backend.firmware, test_name + "_2")
 
         sol = SolanaClient(backend)
+        from_public_key = sol.get_public_key(SOL_PACKED_DERIVATION_PATH)
 
-        offchain_message: OffchainMessage = OffchainMessage(0, bytes("Тестовое сообщение", 'utf-8'))
+        offchain_message: OffchainMessage = OffchainMessage(0, bytes("Тестовое сообщение", 'utf-8'),from_public_key)
         message: bytes = offchain_message.serialize()
 
         backend.raise_policy = RaisePolicy.RAISE_NOTHING
@@ -390,4 +484,4 @@ def test_solana_trusted_name_create(self, backend, scenario_navigator):
         with sol.send_async_sign_message(SOL.SOL_PACKED_DERIVATION_PATH, message):
             scenario_navigator.review_approve(path=ROOT_SCREENSHOT_PATH)
         signature: bytes = sol.get_async_response().data
-        verify_signature(SOL.OWNED_PUBLIC_KEY, message, signature)
+        verify_signature(SOL.OWNED_PUBLIC_KEY, message, signature)
\ No newline at end of file