diff --git a/src/interactions/signTx.ts b/src/interactions/signTx.ts
index ea16700a..3ae49044 100644
--- a/src/interactions/signTx.ts
+++ b/src/interactions/signTx.ts
@@ -10,8 +10,8 @@ import type {
 } from "../Ada";
 import { Errors, } from "../Ada"
 import cardano, { SignTxIncluded } from "../cardano";
-import type { ParsedCertificate, ParsedOutput, ParsedWithdrawal } from "../parsing";
-import { CertificateType, parseCertificates, parseTxOutput, parseWithdrawal, validateTransaction } from "../parsing";
+import type { ParsedCertificate, ParsedInput, ParsedOutput, ParsedWithdrawal } from "../parsing";
+import { CertificateType, parseCertificates, parseTxInput, parseTxOutput, parseWithdrawal, validateTransaction } from "../parsing";
 import utils, { Assert, invariant, Precondition, unreachable } from "../utils";
 import { INS } from "./common/ins";
 import { wrapRetryStillInCall } from "./common/retry";
@@ -131,7 +131,7 @@ const signTx_init = async (
 
 const signTx_addInput = async (
   _send: SendFn,
-  input: InputTypeUTxO
+  input: ParsedInput
 ): Promise<void> => {
   const enum P2 {
     UNUSED = 0x00,
@@ -593,7 +593,7 @@ export async function signTransaction(
   );
 
   // inputs
-  for (const input of inputs) {
+  for (const input of inputs.map(i => parseTxInput(i))) {
     await signTx_addInput(_send, input);
   }
 
diff --git a/src/parsing.ts b/src/parsing.ts
index d9188f54..4928fe43 100644
--- a/src/parsing.ts
+++ b/src/parsing.ts
@@ -178,18 +178,11 @@ export function validateTransaction(
 
     // inputs
     Precondition.checkIsArray(inputs, TxErrors.INPUTS_NOT_ARRAY);
-    for (const input of inputs) {
-        Precondition.checkIsHexStringOfLength(
-            input.txHashHex,
-            TX_HASH_LENGTH,
-            TxErrors.INPUT_INVALID_TX_HASH
-        );
-
-        if (isSigningPoolRegistrationAsOwner) {
-            // input should not be given with a path
-            // the path is not used, but we check just to avoid potential confusion of developers using this
-            Precondition.check(!input.path, TxErrors.INPUT_WITH_PATH);
-        }
+    const _inputs = inputs.map(inp => parseTxInput(inp))
+    if (isSigningPoolRegistrationAsOwner) {
+        // input should not be given with a path
+        // the path is not used, but we check just to avoid potential confusion of developers using this
+        Precondition.check(_inputs.every(inp => inp == null), TxErrors.INPUT_WITH_PATH_WHEN_SIGNING_AS_POOL_OWNER);
     }
 
     // outputs
@@ -252,6 +245,22 @@ export function validateTransaction(
     }
 }
 
+export type ParsedInput = {
+    txHashHex: FixlenHexString<typeof TX_HASH_LENGTH>
+    outputIndex: Uint32_t
+    path: BIP32Path | null
+}
+
+export function parseTxInput(input: InputTypeUTxO): ParsedInput {
+    const txHashHex = parseHexStringOfLength(input.txHashHex, TX_HASH_LENGTH, TxErrors.INPUT_INVALID_TX_HASH)
+    const outputIndex = parseUint32_t(input.outputIndex, TxErrors.INPUT_INVALID_UTXO_INDEX)
+    return {
+        txHashHex,
+        outputIndex,
+        path: input.path != null ? parseBIP32Path(input.path, TxErrors.INPUT_INVALID_PATH) : null
+    }
+}
+
 export type ParsedWithdrawal = {
     amountStr: Uint64_str
     path: ValidBIP32Path
diff --git a/src/txErrors.ts b/src/txErrors.ts
index 92711e4f..12e52ce1 100644
--- a/src/txErrors.ts
+++ b/src/txErrors.ts
@@ -4,9 +4,11 @@ export enum TxErrors {
   INVALID_NETWORK_ID = "invalid network id",
 
   INPUTS_NOT_ARRAY = "inputs not an array",
-  INPUT_WITH_PATH =
-  "stake pool registration= inputs should not contain the witness path",
+  INPUT_WITH_PATH_WHEN_SIGNING_AS_POOL_OWNER =
+  "inputs should not contain the witness path if signing stake pool certificate as owner",
   INPUT_INVALID_TX_HASH = "invalid tx hash in an input",
+  INPUT_INVALID_PATH = "invalid input path",
+  INPUT_INVALID_UTXO_INDEX = "invalid input utxo index",
 
   OUTPUTS_NOT_ARRAY = "outputs not an array",
   OUTPUT_INVALID_AMOUNT = "invalid amount in an output",