diff --git a/packages/shared/src/types.ts b/packages/shared/src/types.ts
index 8d4b96cdb..8d5ea9f0c 100644
--- a/packages/shared/src/types.ts
+++ b/packages/shared/src/types.ts
@@ -30,10 +30,11 @@ export type PackedUserOperationToSign = {
   nonce: bigint | number;
   initCode: `0x${string}` | Uint8Array;
   callData: `0x${string}` | Uint8Array;
-  accountGasLimit: `0x${string}` | Uint8Array;
+  accountGasLimits: `0x${string}` | Uint8Array;
   preVerificationGas: bigint | number;
   gasFees: `0x${string}` | Uint8Array;
   paymasterAndData: `0x${string}` | Uint8Array;
+  signature?: `0x${string}` | Uint8Array | undefined;
 };
 
 function getBigIntValue(value: bigint | number): bigint {
@@ -101,7 +102,7 @@ export function toCorePackedUserOperation(
     getBigIntValue(packedUserOperation.nonce),
     getUint8ArrayValue(packedUserOperation.initCode),
     getUint8ArrayValue(packedUserOperation.callData),
-    getUint8ArrayValue(packedUserOperation.accountGasLimit),
+    getUint8ArrayValue(packedUserOperation.accountGasLimits),
     getBigIntValue(packedUserOperation.preVerificationGas),
     getUint8ArrayValue(packedUserOperation.gasFees),
     getUint8ArrayValue(packedUserOperation.paymasterAndData),
diff --git a/packages/shared/test/porter.test.ts b/packages/shared/test/porter.test.ts
index ae057ba54..046894664 100644
--- a/packages/shared/test/porter.test.ts
+++ b/packages/shared/test/porter.test.ts
@@ -289,7 +289,7 @@ describe('PorterClient Signing', () => {
             BigInt(123), // nonce
             fromHexString('0xabc'), // initCode
             fromHexString('0xdef'), // callData
-            fromHexString('0x01020304'), // accountGasLimit
+            fromHexString('0x01020304'), // accountGasLimits
             BigInt(101112), // preVerificationGas
             fromHexString('0x05060708'), // gasFees
             fromHexString('0x090a0b0c'), // paymasterAndData
diff --git a/packages/taco/src/index.ts b/packages/taco/src/index.ts
index 34e6bdf0f..866ce1c24 100644
--- a/packages/taco/src/index.ts
+++ b/packages/taco/src/index.ts
@@ -1,6 +1,8 @@
 export { DkgPublicKey, ThresholdMessageKit } from '@nucypher/nucypher-core';
 export {
   Domain,
+  PackedUserOperationToSign,
+  UserOperationToSign,
   domains,
   fromBytes,
   getPorterUris,
diff --git a/packages/taco/src/sign.ts b/packages/taco/src/sign.ts
index ef2df329b..31b5c62bf 100644
--- a/packages/taco/src/sign.ts
+++ b/packages/taco/src/sign.ts
@@ -51,20 +51,30 @@ export type SignResult = {
 };
 
 function aggregateSignatures(
-  signaturesByAddress: {
-    [checksumAddress: string]: TacoSignature;
-  },
+  signatures: TacoSignature[],
   threshold: number,
 ): string {
-  // Aggregate hex signatures by concatenating them; being careful to remove the '0x' prefix from each signature except the first one.
-  const signatures = Object.values(signaturesByAddress)
-    .map((sig) => sig.signature)
-    .slice(0, threshold);
-  if (signatures.length === 1) {
-    return signatures[0];
+  // Aggregate hex signatures by concatenating them; being careful to sort
+  //  and remove the '0x' prefix from each signature except the first one.
+
+  // sort by signer address
+  const sortedSignatures = [...signatures]
+    .sort((a, b) =>
+      a.signerAddress
+        .toLowerCase()
+        .localeCompare(b.signerAddress.toLowerCase()),
+    )
+    .map((sig) => sig.signature);
+
+  const thresholdSignatures = sortedSignatures.slice(0, threshold);
+  if (thresholdSignatures.length === 1) {
+    return thresholdSignatures[0];
   }
+
   // Concatenate signatures
-  const allBytes = signatures.flatMap((hex) => Array.from(fromHexString(hex)));
+  const allBytes = thresholdSignatures.flatMap((sig) =>
+    Array.from(fromHexString(sig)),
+  );
   return `0x${toHexString(new Uint8Array(allBytes))}`;
 }
 
@@ -197,7 +207,7 @@ export async function signUserOp(
   );
 
   const aggregatedSignature = aggregateSignatures(
-    signaturesToAggregate,
+    Object.values(signaturesToAggregate),
     threshold,
   );
 
@@ -300,7 +310,7 @@ function collectSignatures(
 
   // Insufficient signatures for a message hash to meet the threshold
   if (!signaturesToAggregate) {
-    //we have multiple hashes, which means we have mismatched hashes from different nodes
+    // we have multiple hashes, which means we have mismatched hashes from different nodes
     //    we don't really expect this to happen (other than some malicious nodes)
     console.error(
       'Porter returned mismatched message hashes:',
diff --git a/packages/taco/test/taco-sign.test.ts b/packages/taco/test/taco-sign.test.ts
index ed73e3c03..fcce85295 100644
--- a/packages/taco/test/taco-sign.test.ts
+++ b/packages/taco/test/taco-sign.test.ts
@@ -53,11 +53,11 @@ function checkPackedUserOpEquality(
       : fromHexString(op1.callData);
   expect(callData).toEqual(op2.callData);
 
-  const accountGasLimit =
-    op1.accountGasLimit instanceof Uint8Array
-      ? op1.accountGasLimit
-      : fromHexString(op1.accountGasLimit);
-  expect(accountGasLimit).toEqual(op2.accountGasLimits);
+  const accountGasLimits =
+    op1.accountGasLimits instanceof Uint8Array
+      ? op1.accountGasLimits
+      : fromHexString(op1.accountGasLimits);
+  expect(accountGasLimits).toEqual(op2.accountGasLimits);
 
   expect(toBigInt(op1.preVerificationGas)).toEqual(op2.preVerificationGas);
 
@@ -290,7 +290,7 @@ describe('TACo Signing', () => {
       nonce: BigInt(123),
       initCode: fromHexString('0xabc'),
       callData: fromHexString('0xdef'),
-      accountGasLimit: fromHexString('0x01020304'),
+      accountGasLimits: fromHexString('0x01020304'),
       preVerificationGas: BigInt(101112),
       gasFees: fromHexString('0x05060708'),
       paymasterAndData: fromHexString('0x090a0b0c'),
@@ -307,7 +307,7 @@ describe('TACo Signing', () => {
         nonce: 1,
         initCode: '0xabc',
         callData: '0xdef',
-        accountGasLimit: '0x01020304',
+        accountGasLimits: '0x01020304',
         preVerificationGas: 4096,
         gasFees: '0x05060708',
         paymasterAndData: '0x090a0b0c',
@@ -333,7 +333,7 @@ describe('TACo Signing', () => {
       nonce: BigInt(1),
       initCode: fromHexString('0xabc'),
       callData: fromHexString('0xdef'),
-      accountGasLimit: fromHexString('0x01020304'),
+      accountGasLimits: fromHexString('0x01020304'),
       preVerificationGas: BigInt(101112),
       gasFees: fromHexString('0x05060708'),
       paymasterAndData: fromHexString('0x090a0b0c'),
@@ -357,24 +357,25 @@ describe('TACo Signing', () => {
         userOp: UserOperationToSign | PackedUserOperationToSign,
       ) => {
         const encryptedResponses = {
-          '0xnode1': new SignatureResponse(
-            signersInfo['0xnode1'].signerAddress,
+          // return out of order to ensure sorting works correctly
+          '0xnode2': new SignatureResponse(
+            signersInfo['0xnode2'].signerAddress,
             fromHexString('0xa1'),
-            fromHexString('0xdead'),
+            fromHexString('0xbeef'),
             0,
           ).encrypt(
             requesterSk.deriveSharedSecret(
-              signersInfo['0xnode1'].signingRequestStaticKey,
+              signersInfo['0xnode2'].signingRequestStaticKey,
             ),
           ),
-          '0xnode2': new SignatureResponse(
-            signersInfo['0xnode2'].signerAddress,
+          '0xnode1': new SignatureResponse(
+            signersInfo['0xnode1'].signerAddress,
             fromHexString('0xa1'),
-            fromHexString('0xbeef'),
+            fromHexString('0xdead'),
             0,
           ).encrypt(
             requesterSk.deriveSharedSecret(
-              signersInfo['0xnode2'].signingRequestStaticKey,
+              signersInfo['0xnode1'].signingRequestStaticKey,
             ),
           ),
         };