diff --git a/src.ts/transaction/transaction.ts b/src.ts/transaction/transaction.ts
index 92157feda..b9ec51d75 100644
--- a/src.ts/transaction/transaction.ts
+++ b/src.ts/transaction/transaction.ts
@@ -206,11 +206,9 @@ function _parseLegacy(data: Uint8Array): TransactionLike {
 }
 
 function _serializeLegacy(tx: Transaction, sig?: Signature): string {
-    assertArgument(tx.isLegacy(), "internal check failed; !legacy", "tx", tx);
-
     const fields: Array<any> = [
         formatNumber(tx.nonce, "nonce"),
-        formatNumber(tx.gasPrice, "gasPrice"),
+        formatNumber(tx.gasPrice || 0, "gasPrice"),
         formatNumber(tx.gasLimit, "gasLimit"),
         (tx.to || "0x"),
         formatNumber(tx.value, "value"),
@@ -312,18 +310,16 @@ function _parseEip1559(data: Uint8Array): TransactionLike {
 }
 
 function _serializeEip1559(tx: Transaction, sig?: Signature): string {
-    assertArgument(tx.isLondon(), "internal check failed; !london", "tx", tx);
-
     const fields: Array<any> = [
         formatNumber(tx.chainId, "chainId"),
         formatNumber(tx.nonce, "nonce"),
-        formatNumber(tx.maxPriorityFeePerGas, "maxPriorityFeePerGas"),
-        formatNumber(tx.maxFeePerGas, "maxFeePerGas"),
+        formatNumber(tx.maxPriorityFeePerGas || 0, "maxPriorityFeePerGas"),
+        formatNumber(tx.maxFeePerGas || 0, "maxFeePerGas"),
         formatNumber(tx.gasLimit, "gasLimit"),
         (tx.to || "0x"),
         formatNumber(tx.value, "value"),
         tx.data,
-        formatAccessList(tx.accessList)
+        formatAccessList(tx.accessList || [ ])
     ];
 
     if (sig) {
@@ -364,17 +360,15 @@ function _parseEip2930(data: Uint8Array): TransactionLike {
 }
 
 function _serializeEip2930(tx: Transaction, sig?: Signature): string {
-    assertArgument(tx.isBerlin(), "internal check failed; !berlin", "tx", tx);
-
     const fields: any = [
         formatNumber(tx.chainId, "chainId"),
         formatNumber(tx.nonce, "nonce"),
-        formatNumber(tx.gasPrice, "gasPrice"),
+        formatNumber(tx.gasPrice || 0, "gasPrice"),
         formatNumber(tx.gasLimit, "gasLimit"),
         (tx.to || "0x"),
         formatNumber(tx.value, "value"),
         tx.data,
-        formatAccessList(tx.accessList)
+        formatAccessList(tx.accessList || [ ])
     ];
 
     if (sig) {
@@ -426,20 +420,18 @@ function _parseEip4844(data: Uint8Array): TransactionLike {
 }
 
 function _serializeEip4844(tx: Transaction, sig?: Signature): string {
-    assertArgument(tx.isCancun(), "internal check failed; !cancun", "tx", tx);
-
     const fields: Array<any> = [
         formatNumber(tx.chainId, "chainId"),
         formatNumber(tx.nonce, "nonce"),
-        formatNumber(tx.maxPriorityFeePerGas, "maxPriorityFeePerGas"),
-        formatNumber(tx.maxFeePerGas, "maxFeePerGas"),
+        formatNumber(tx.maxPriorityFeePerGas || 0, "maxPriorityFeePerGas"),
+        formatNumber(tx.maxFeePerGas || 0, "maxFeePerGas"),
         formatNumber(tx.gasLimit, "gasLimit"),
-        tx.to,
+        (tx.to || ZeroAddress),
         formatNumber(tx.value, "value"),
         tx.data,
-        (formatAccessList(tx.accessList)),
-        formatNumber(tx.maxFeePerBlobGas, "maxFeePerBlobGas"),
-        formatHashes(tx.blobVersionedHashes, "blobVersionedHashes")
+        formatAccessList(tx.accessList || [ ]),
+        formatNumber(tx.maxFeePerBlobGas || 0, "maxFeePerBlobGas"),
+        formatHashes(tx.blobVersionedHashes || [ ], "blobVersionedHashes")
     ];
 
     if (sig) {