diff --git a/src/Utils/Abi/ArgumentDecoder.php b/src/Utils/Abi/ArgumentDecoder.php
index eac3fbc1..3efc708e 100644
--- a/src/Utils/Abi/ArgumentDecoder.php
+++ b/src/Utils/Abi/ArgumentDecoder.php
@@ -12,7 +12,13 @@ final class ArgumentDecoder
 
     public function __construct(string $bytes)
     {
-        $bytes = hex2bin($bytes);
+        try {
+            $bytes = hex2bin($bytes);
+        } catch (\Throwable $e) {
+            // Handle the case where hex2bin fails, e.g., invalid hex string
+            $bytes = false;
+        }
+
         if ($bytes === false) {
             $bytes = '';
         }
diff --git a/src/Utils/Message.php b/src/Utils/Message.php
index 3e1ef91a..311f0dfb 100644
--- a/src/Utils/Message.php
+++ b/src/Utils/Message.php
@@ -44,16 +44,11 @@ class Message
      */
     public function __construct(object $message)
     {
-        if (property_exists($message, 'publickey')) {
-            $this->publicKey = $message->publickey;
-        } elseif (property_exists($message, 'publicKey')) {
-            $this->publicKey = $message->publicKey;
-        } elseif (property_exists($message, 'signatory')) {
-            $this->publicKey = $message->signatory;
-        } else {
+        if (! property_exists($message, 'publicKey')) {
             throw new InvalidArgumentException('The given message did not contain a valid public key.');
         }
 
+        $this->publicKey = $message->publicKey;
         $this->signature = $message->signature;
         $this->message   = $message->message;
     }
@@ -113,7 +108,7 @@ public static function sign(string $message, string $passphrase): self
         $v = dechex($signature->getRecoveryId() + 27);
 
         return static::new([
-            'publickey' => $privateKey->publicKey,
+            'publicKey' => $privateKey->publicKey,
             'signature' => $r.$s.$v,
             'message'   => $message,
         ]);
@@ -144,7 +139,7 @@ public function verify(): bool
     public function toArray(): array
     {
         return [
-            'publickey' => $this->publicKey,
+            'publicKey' => $this->publicKey,
             'signature' => $this->signature,
             'message'   => $this->message,
         ];
diff --git a/tests/Unit/Utils/Abi/ArgumentDecoderTest.php b/tests/Unit/Utils/Abi/ArgumentDecoderTest.php
index 0c388b50..df0d7cb7 100644
--- a/tests/Unit/Utils/Abi/ArgumentDecoderTest.php
+++ b/tests/Unit/Utils/Abi/ArgumentDecoderTest.php
@@ -19,6 +19,15 @@
     expect($decoder->decodeAddress())->toBe($expected);
 });
 
+it('should decode a string', function () {
+    $payload  = '0000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000474657374';
+    $expected = 'test';
+
+    $decoder = new ArgumentDecoder($payload);
+
+    expect($decoder->decodeString())->toBe($expected);
+});
+
 it('should decode unsigned int', function () {
     $payload  = '000000000000000000000000000000000000000000000000016345785d8a0000';
     $expected = '100000000000000000';
@@ -54,3 +63,12 @@
 
     expect($decoder->decodeBool())->toBe($expected);
 });
+
+it('should handle issue converting hex to binary', function () {
+    $decoder = new ArgumentDecoder('invalid');
+
+    $reflectionProperty = new \ReflectionProperty(ArgumentDecoder::class, 'bytes');
+    $reflectionProperty->setAccessible(true);
+
+    expect($reflectionProperty->getValue($decoder))->toBe('');
+});
diff --git a/tests/Unit/Utils/AddressTest.php b/tests/Unit/Utils/AddressTest.php
index 6f0ba7bb..b70e8daa 100644
--- a/tests/Unit/Utils/AddressTest.php
+++ b/tests/Unit/Utils/AddressTest.php
@@ -2,6 +2,7 @@
 
 declare(strict_types=1);
 
+use ArkEcosystem\Crypto\ByteBuffer\ByteBuffer;
 use ArkEcosystem\Crypto\Utils\Address as TestClass;
 
 test('it should validate the address', function () {
@@ -17,3 +18,19 @@
 
     expect($actual)->toBeFalse();
 });
+
+it('should convert to hex string', function () {
+    $fixture = $this->getFixture('identity');
+
+    $actual = TestClass::toBufferHexString($fixture['data']['address']);
+
+    expect($actual)->toBe(substr($fixture['data']['address'], 2));
+});
+
+it('should extract address from a byte buffer', function () {
+    $fixture = $this->getFixture('identity');
+
+    $actual = TestClass::fromByteBuffer(ByteBuffer::fromHex(substr($fixture['data']['address'], 2)));
+
+    expect($actual)->toBe($fixture['data']['address']);
+});
diff --git a/tests/Unit/Utils/MessageTest.php b/tests/Unit/Utils/MessageTest.php
index 2ce906b2..35093fee 100644
--- a/tests/Unit/Utils/MessageTest.php
+++ b/tests/Unit/Utils/MessageTest.php
@@ -34,6 +34,14 @@
     expect($message->message)->toBe($fixture['message']);
 });
 
+test('it should throw if no public key is provided', function () {
+    $fixture = $this->getFixture('message-sign');
+
+    unset($fixture['publicKey']);
+
+    Message::new($fixture);
+})->throws(InvalidArgumentException::class, 'The given message did not contain a valid public key.');
+
 test('it should create a message from a string', function () {
     $fixture = $this->getFixture('message-sign');
 
diff --git a/tests/Unit/Utils/TransactionUtilsTest.php b/tests/Unit/Utils/TransactionUtilsTest.php
new file mode 100644
index 00000000..c45005a7
--- /dev/null
+++ b/tests/Unit/Utils/TransactionUtilsTest.php
@@ -0,0 +1,80 @@
+<?php
+
+declare(strict_types=1);
+
+use ArkEcosystem\Crypto\Utils\RlpDecoder;
+use ArkEcosystem\Crypto\Utils\TransactionUtils;
+use Brick\Math\BigDecimal;
+
+it('should convert a transaction to a buffer', function () {
+    $fixture = $this->getTransactionFixture('evm_call', 'username-resignation');
+
+    $transaction = TransactionUtils::toBuffer($fixture['data']);
+
+    expect($transaction->getHex())->toBe($fixture['serialized']);
+});
+
+it('should convert a transaction to a buffer when data starts with 0x', function () {
+    $fixture = $this->getTransactionFixture('evm_call', 'username-resignation');
+
+    $fixture['data']['data'] = '0x'.$fixture['data']['data'];
+
+    $transaction = TransactionUtils::toBuffer($fixture['data']);
+
+    expect($transaction->getHex())->toBe($fixture['serialized']);
+});
+
+it('should get the hash for a transaction', function () {
+    $fixture = $this->getTransactionFixture('evm_call', 'username-resignation');
+
+    $transaction = TransactionUtils::toHash($fixture['data']);
+
+    expect($transaction->getHex())->toBe($fixture['data']['hash']);
+});
+
+it('should handle string data starting with 0x', function () {
+    $fixture = $this->getTransactionFixture('evm_call', 'username-resignation');
+
+    $fixture['data']['gasPrice'] = '0x'.dechex($fixture['data']['gasPrice']);
+
+    $transaction = TransactionUtils::toBuffer($fixture['data']);
+
+    expect($transaction->getHex())->toBe($fixture['serialized']);
+});
+
+it('should handle BigDecimal value', function () {
+    $fixture = $this->getTransactionFixture('evm_call', 'username-resignation');
+
+    $fixture['data']['gasPrice'] = BigDecimal::of($fixture['data']['gasPrice']);
+
+    $transaction = TransactionUtils::toBuffer($fixture['data']);
+
+    expect($transaction->getHex())->toBe($fixture['serialized']);
+});
+
+it('should handle zero BigDecimal value', function () {
+    $fixture = $this->getTransactionFixture('evm_call', 'username-resignation');
+
+    $fixture['data']['gasPrice'] = BigDecimal::zero();
+
+    $transaction = TransactionUtils::toBuffer($fixture['data'], true);
+
+    $decoded = RlpDecoder::decode('0x'.substr($transaction->getHex(), 2));
+
+    expect($decoded[3])->toBe('0x');
+});
+
+it('should handle unknown value value', function () {
+    $fixture = $this->getTransactionFixture('evm_call', 'username-resignation');
+
+    $fixture['data']['gasPrice'] = 123.456;
+
+    $transaction = TransactionUtils::toBuffer($fixture['data'], true);
+
+    $decoded = RlpDecoder::decode('0x'.substr($transaction->getHex(), 2));
+
+    expect($decoded[3])->toBe('0x');
+});
+
+// toBuffer
+// toHash