diff --git a/xrpl4j-core/src/test/java/org/xrpl/xrpl4j/crypto/signing/SignedTransactionTest.java b/xrpl4j-core/src/test/java/org/xrpl/xrpl4j/crypto/signing/SignedTransactionTest.java
index 490882afb..75ba502c2 100644
--- a/xrpl4j-core/src/test/java/org/xrpl/xrpl4j/crypto/signing/SignedTransactionTest.java
+++ b/xrpl4j-core/src/test/java/org/xrpl/xrpl4j/crypto/signing/SignedTransactionTest.java
@@ -33,22 +33,28 @@
 import org.xrpl.xrpl4j.model.flags.TransactionFlags;
 import org.xrpl.xrpl4j.model.jackson.ObjectMapperFactory;
 import org.xrpl.xrpl4j.model.transactions.Address;
+import org.xrpl.xrpl4j.model.transactions.Memo;
+import org.xrpl.xrpl4j.model.transactions.MemoWrapper;
 import org.xrpl.xrpl4j.model.transactions.Payment;
 import org.xrpl.xrpl4j.model.transactions.XrpCurrencyAmount;
 
+import java.util.Arrays;
+import java.util.Collections;
+
 /**
  * Unit tests for {@link SingleSignedTransaction}.
  */
 class SignedTransactionTest {
 
   /**
-   * This test constructs the transaction found here:
-   * https://livenet.xrpl.org/transactions/A7AE53FE15B02E6E2F3C610FB4BA30B12392EB110F1D5E8C20880555E8639B05 to check
-   * that the hash that's on livenet matches what this library computes. The hash you see in this test is different than
-   * the hash found on livenet because the real transaction did not set any flags on the transaction and {@link Payment}
-   * requires a flags field (Even if you set flags to 0, it affects the hash). However, we made {@link Payment#flags()}
-   * nullable during development and verified that the hashes match, so we are confident that our hash calculation is
-   * accurate.
+   * This test constructs the transaction with hash A7AE53FE15B02E6E2F3C610FB4BA30B12392EB110F1D5E8C20880555E8639B05 to
+   * check that the hash that's on livenet matches what this library computes. The hash you see in this test is
+   * different from the hash found on livenet because the real transaction did not set any flags on the transaction and
+   * {@link Payment} requires a flags field (Even if you set flags to 0, it affects the hash). However, we made
+   * {@link Payment#flags()} nullable during development and verified that the hashes match, so we are confident that
+   * our hash calculation is accurate.
+   *
+   * @see "https://livenet.xrpl.org/transactions/A7AE53FE15B02E6E2F3C610FB4BA30B12392EB110F1D5E8C20880555E8639B05"
    */
   @Test
   public void computesCorrectTransactionHash() throws JsonProcessingException {
@@ -65,18 +71,66 @@ public void computesCorrectTransactionHash() throws JsonProcessingException {
       .destinationTag(UnsignedInteger.valueOf(371969))
       .build();
 
+    final Signature signature = Signature.fromBase16(
+      "304502210093257D8E88D2A92CE55977641F72CCD235AB76B1AE189BE3377F30A69B131C49" +
+        "02200B79836114069F0D331418D05818908D85DE755AE5C2DDF42E9637FE1C11754F"
+    );
+
     final Payment signedPayment = Payment.builder().from(unsignedTransaction)
-      .transactionSignature(Signature.fromBase16(
-        "304502210093257D8E88D2A92CE55977641F72CCD235AB76B1AE189BE3377F30A6" +
-          "9B131C4902200B79836114069F0D331418D05818908D85DE755AE5C2DDF42E9637FE1C11754F"
+      .transactionSignature(signature)
+      .build();
+
+    SingleSignedTransaction<Payment> signedTransaction = SingleSignedTransaction.<Payment>builder()
+      .signedTransaction(signedPayment)
+      .signature(signature)
+      .unsignedTransaction(unsignedTransaction)
+      .build();
+
+    String expectedHash = "F847C96B2EEB0609F16C9DB9D74A0CB123B5EAF5B626207977335BF0A1EF53C3";
+    assertThat(signedTransaction.hash().value()).isEqualTo(expectedHash);
+    assertThat(signedTransaction.unsignedTransaction()).isEqualTo(unsignedTransaction);
+    assertThat(signedTransaction.signedTransaction()).isEqualTo(signedPayment);
+    assertThat(signedTransaction.signedTransactionBytes().hexValue()).isEqualTo(
+      XrplBinaryCodec.getInstance().encode(ObjectMapperFactory.create().writeValueAsString(signedPayment))
+    );
+  }
+
+  /**
+   * This test constructs the transaction with hash 1A1953AC3BA3123254AA912CE507514A6AAD05EED8981A870B45F604936F0997 to
+   * check that the hash that's on livenet matches what this library computes.
+   *
+   * @see "https://livenet.xrpl.org/transactions/1A1953AC3BA3123254AA912CE507514A6AAD05EED8981A870B45F604936F0997"
+   */
+  @Test
+  public void computesCorrectTransactionHashWithUnsetFlags() throws JsonProcessingException {
+    final Payment unsignedTransaction = Payment.builder()
+      .account(Address.of("rGWx7VAsnwVKRbPFPpvy8Lo4nFf5xjj6Zb"))
+      .amount(XrpCurrencyAmount.ofDrops(1))
+      .destination(Address.of("rxRpSNb1VktvzBz8JF2oJC6qaww6RZ7Lw"))
+      .fee(XrpCurrencyAmount.ofDrops(12))
+      .flags(PaymentFlags.of(TransactionFlags.UNSET.getValue())) // 0
+      .lastLedgerSequence(UnsignedInteger.valueOf(86481544))
+      .memos(Collections.singletonList(
+        MemoWrapper.builder()
+          .memo(Memo.builder()
+            .memoData("7B226F70223A226D696E74222C22616D6F756E74223A22313030303030303030222C22677061223A2230227D")
+            .build())
+          .build()
       ))
+      .sequence(UnsignedInteger.valueOf(84987644))
+      .signingPublicKey(
+        PublicKey.fromBase16EncodedPublicKey("ED05DC98B76FCD734BD44CDF153C34F79728485D2F24F9381CF7A284223EA258CE")
+      )
       .build();
 
-    final Signature signature = Signature.builder().value(
-      UnsignedByteArray.of(BaseEncoding.base16()
-        .decode("304502210093257D8E88D2A92CE55977641F72CCD235AB76B1AE189BE3377F30A69B131C49" +
-          "02200B79836114069F0D331418D05818908D85DE755AE5C2DDF42E9637FE1C11754F"))
-    ).build();
+    final Signature signature = Signature.fromBase16(
+      "ED6F91CCF14EE94EB072C7671A397A313E3E5CBDAFE773BB6B2F07A0E75A7E65F84B5516268DAEE12902265256" +
+        "EA1EF046B200148E14FF4E720C06519FD7F40F"
+    );
+
+    final Payment signedPayment = Payment.builder().from(unsignedTransaction)
+      .transactionSignature(signature)
+      .build();
 
     SingleSignedTransaction<Payment> signedTransaction = SingleSignedTransaction.<Payment>builder()
       .signedTransaction(signedPayment)
@@ -84,7 +138,7 @@ public void computesCorrectTransactionHash() throws JsonProcessingException {
       .unsignedTransaction(unsignedTransaction)
       .build();
 
-    String expectedHash = "F847C96B2EEB0609F16C9DB9D74A0CB123B5EAF5B626207977335BF0A1EF53C3";
+    String expectedHash = "1A1953AC3BA3123254AA912CE507514A6AAD05EED8981A870B45F604936F0997";
     assertThat(signedTransaction.hash().value()).isEqualTo(expectedHash);
     assertThat(signedTransaction.unsignedTransaction()).isEqualTo(unsignedTransaction);
     assertThat(signedTransaction.signedTransaction()).isEqualTo(signedPayment);
@@ -92,4 +146,57 @@ public void computesCorrectTransactionHash() throws JsonProcessingException {
       XrplBinaryCodec.getInstance().encode(ObjectMapperFactory.create().writeValueAsString(signedPayment))
     );
   }
+
+  /**
+   * This test constructs the transaction with hash 1A1953AC3BA3123254AA912CE507514A6AAD05EED8981A870B45F604936F0997 to
+   * check that the hash that's on livenet _does not_ match when the signature is supplied incorrectly (i.e., this test
+   * validates that a transaction's signature is always used to compute a transaction hash).
+   *
+   * @see "https://livenet.xrpl.org/transactions/1A1953AC3BA3123254AA912CE507514A6AAD05EED8981A870B45F604936F0997"
+   */
+  @Test
+  public void computesIncorrectTransactionHashWithoutSignature() throws JsonProcessingException {
+    final Payment unsignedTransaction = Payment.builder()
+      .account(Address.of("rGWx7VAsnwVKRbPFPpvy8Lo4nFf5xjj6Zb"))
+      .amount(XrpCurrencyAmount.ofDrops(1))
+      .destination(Address.of("rxRpSNb1VktvzBz8JF2oJC6qaww6RZ7Lw"))
+      .fee(XrpCurrencyAmount.ofDrops(12))
+      .flags(PaymentFlags.of(TransactionFlags.UNSET.getValue())) // 0
+      .lastLedgerSequence(UnsignedInteger.valueOf(86481544))
+      .memos(Collections.singletonList(
+        MemoWrapper.builder()
+          .memo(Memo.builder()
+            .memoData("7B226F70223A226D696E74222C22616D6F756E74223A22313030303030303030222C22677061223A2230227D")
+            .build())
+          .build()
+      ))
+      .sequence(UnsignedInteger.valueOf(84987644))
+      .signingPublicKey(
+        PublicKey.fromBase16EncodedPublicKey("ED05DC98B76FCD734BD44CDF153C34F79728485D2F24F9381CF7A284223EA258CE")
+      )
+      .build();
+
+    final Signature emptySignature = Signature.fromBase16("");
+
+    final Payment signedPayment = Payment.builder().from(unsignedTransaction)
+      .transactionSignature(emptySignature)
+      .build();
+
+    SingleSignedTransaction<Payment> signedTransaction = SingleSignedTransaction.<Payment>builder()
+      .signedTransaction(signedPayment)
+      .signature(emptySignature)
+      .unsignedTransaction(unsignedTransaction)
+      .build();
+
+    String expectedHash = "1A1953AC3BA3123254AA912CE507514A6AAD05EED8981A870B45F604936F0997";
+    assertThat(signedTransaction.hash().value()).isNotEqualTo(expectedHash);
+    assertThat(signedTransaction.hash().value()).isEqualTo(
+      "8E0EDE65ECE8A03ABDD7926B994B2F6F14514FDBD46714F4F511143A1F01A6D0"
+    );
+    assertThat(signedTransaction.unsignedTransaction()).isEqualTo(unsignedTransaction);
+    assertThat(signedTransaction.signedTransaction()).isEqualTo(signedPayment);
+    assertThat(signedTransaction.signedTransactionBytes().hexValue()).isEqualTo(
+      XrplBinaryCodec.getInstance().encode(ObjectMapperFactory.create().writeValueAsString(signedPayment))
+    );
+  }
 }