diff --git a/package.json b/package.json
index bf59002..a00f1ad 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@orionprotocol/sdk",
-  "version": "0.20.9-dev.1",
+  "version": "0.20.9-dev.2",
   "description": "Orion Protocol SDK",
   "main": "./lib/index.cjs",
   "module": "./lib/index.js",
diff --git a/src/crypt/hashCrossChainOrder.ts b/src/crypt/hashCrossChainOrder.ts
new file mode 100644
index 0000000..371c016
--- /dev/null
+++ b/src/crypt/hashCrossChainOrder.ts
@@ -0,0 +1,40 @@
+import { ethers } from "ethers";
+import type { CrossChainOrder } from "../types.js";
+
+const hashCrossChainOrder = (order: CrossChainOrder) =>
+  ethers.solidityPackedKeccak256(
+    [
+      "uint8",
+      "address",
+      "address",
+      "address",
+      "address",
+      "address",
+      "uint64",
+      "uint64",
+      "uint64",
+      "uint64",
+      "uint64",
+      "uint8",
+      "bytes32",
+      "uint24",
+    ],
+    [
+      "0x03",
+      order.senderAddress,
+      order.matcherAddress,
+      order.baseAsset,
+      order.quoteAsset,
+      order.matcherFeeAsset,
+      order.amount,
+      order.price,
+      order.matcherFee,
+      order.nonce,
+      order.expiration,
+      order.buySide === 1 ? "0x01" : "0x00",
+      order.secretHash,
+      order.targetChainId,
+    ]
+  );
+
+export default hashCrossChainOrder;
diff --git a/src/crypt/sign-cross-chain-order.ts b/src/crypt/sign-cross-chain-order.ts
index 3952aee..58b794a 100644
--- a/src/crypt/sign-cross-chain-order.ts
+++ b/src/crypt/sign-cross-chain-order.ts
@@ -9,8 +9,8 @@ import type {
 } from "../types.js";
 import normalizeNumber from "../utils/normalizeNumber.js";
 import getDomainData from "./getDomainData.js";
-import hashOrder from "./hashOrder.js";
 import signOrderPersonal from "./signOrderPersonal.js";
+import hashCrossChainOrder from "./hashCrossChainOrder.js";
 
 const DEFAULT_EXPIRATION = 29 * 24 * 60 * 60 * 1000; // 29 days
 
@@ -25,13 +25,14 @@ export const signCrossChainOrder = async (
   matcherAddress: string,
   serviceFeeAssetAddr: string,
   usePersonalSign: boolean,
-  secretHash: string,
+  secret: string,
   targetChainId: number,
   signer: ethers.Signer,
   chainId: SupportedChainId
 ) => {
   const nonce = Date.now();
   const expiration = nonce + DEFAULT_EXPIRATION;
+  const secretHash = ethers.keccak256(secret);
 
   const order: CrossChainOrder = {
     senderAddress,
@@ -60,6 +61,7 @@ export const signCrossChainOrder = async (
     expiration,
     buySide: side === "BUY" ? 1 : 0,
     isPersonalSign: usePersonalSign,
+    secret,
     secretHash,
     targetChainId,
   };
@@ -80,7 +82,7 @@ export const signCrossChainOrder = async (
 
   const signedOrder: SignedCrossChainOrder = {
     ...order,
-    id: hashOrder(order),
+    id: hashCrossChainOrder(order),
     signature: fixedSignature,
   };
   return signedOrder;
diff --git a/src/types.ts b/src/types.ts
index d1db27e..5abdb1c 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -52,6 +52,7 @@ export type Order = {
 }
 
 export type CrossChainOrder = Order & {
+  secret: string // not signed
   secretHash: string // bytes32
   targetChainId: number // uint24
 }