diff --git a/src/identity.ts b/src/identity.ts
index 06cd436..ecd64ca 100644
--- a/src/identity.ts
+++ b/src/identity.ts
@@ -14,7 +14,7 @@ export class IdentityCredential {
     const idNullifier = memKeys.subarray(32, 64);
     const idSecretHash = memKeys.subarray(64, 96);
     const idCommitment = memKeys.subarray(96);
-    const idCommitmentBigInt = buildBigIntFromUint8Array(idCommitment);
+    const idCommitmentBigInt = buildBigIntFromUint8Array(idCommitment, 96);
 
     return new IdentityCredential(
       idTrapdoor,
diff --git a/src/utils/bytes.ts b/src/utils/bytes.ts
index 000488c..279a2b3 100644
--- a/src/utils/bytes.ts
+++ b/src/utils/bytes.ts
@@ -61,9 +61,12 @@ export function writeUIntLE(
  * @param array: Uint8Array
  * @returns BigInt
  */
-export function buildBigIntFromUint8Array(array: Uint8Array): bigint {
+export function buildBigIntFromUint8Array(
+  array: Uint8Array,
+  byteOffset: number = 0
+): bigint {
   const dataView = new DataView(array.buffer);
-  return dataView.getBigUint64(0, true);
+  return dataView.getBigUint64(byteOffset, true);
 }
 
 /**