From 032f8fba615b1841b5bd2c3d41af58c2d33f6907 Mon Sep 17 00:00:00 2001
From: freef <freef@example.com>
Date: Tue, 28 Jul 2026 09:35:21 -0700
Subject: [PATCH 1/2] Add CrossChainBridge smart contract

---
 src/contracts/CrossChainBridge.h | 86 ++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 src/contracts/CrossChainBridge.h

diff --git a/src/contracts/CrossChainBridge.h b/src/contracts/CrossChainBridge.h
new file mode 100644
index 000000000..5ffde369b
--- /dev/null
+++ b/src/contracts/CrossChainBridge.h
@@ -0,0 +1,86 @@
+#ifndef CROSSCHAINBRIDGE_H
+#define CROSSCHAINBRIDGE_H
+
+#include "qpi.h"
+
+#define CCB_CONTRACT_INDEX 5
+#define CCB_MAX_VALIDATORS 16
+#define CCB_REPLAY_BUFFER_SIZE 256
+
+struct CROSSCHAINBRIDGE {
+    id contractOwner;
+    uint8 isPaused;
+    uint64 totalLockedQus;
+    uint64 totalBurnedFees;
+    uint64 fixedBridgeFee;
+
+    id validators[CCB_MAX_VALIDATORS];
+    uint32 validatorCount;
+    uint32 requiredSignatures;
+
+    uint64 nonce;
+
+    uint8_32 processedTxHashes[CCB_REPLAY_BUFFER_SIZE];
+    uint32 replayBufferIndex;
+};
+
+struct CCB_LockQus_input {
+    uint8_32 destinationChainAddress;
+    uint32 destinationChainId;
+    uint64 amount;
+};
+
+struct CCB_LockQus_output {
+    uint64 lockTxNonce;
+    uint8 status;
+};
+
+struct CCB_UnlockQus_input {
+    uint8_32 txHash;
+    uint8_32 targetQubicAddress;
+    uint64 amount;
+    uint64 lockTxNonce;
+    uint8 signatures[CCB_MAX_VALIDATORS][64];
+};
+
+struct CCB_UnlockQus_output {
+    uint8 status;
+};
+
+struct CCB_SetPause_input {
+    id caller;
+    uint8 pauseState;
+};
+
+struct CCB_SetPause_output {
+    uint8 status;
+};
+
+struct CCB_SetQuorum_input {
+    id caller;
+    uint32 newRequiredSignatures;
+};
+
+struct CCB_SetQuorum_output {
+    uint8 status;
+};
+
+struct CCB_SetFee_input {
+    id caller;
+    uint64 newFee;
+};
+
+struct CCB_SetFee_output {
+    uint8 status;
+};
+
+struct CCB_GetStateSummary_output {
+    uint64 totalLockedQus;
+    uint64 totalBurnedFees;
+    uint64 nonce;
+    uint32 validatorCount;
+    uint32 requiredSignatures;
+    uint8 isPaused;
+};
+
+#endif // CROSSCHAINBRIDGE_H

From 5754b5b13d2c83f6d6d2ee9f4612dffeeb51f706 Mon Sep 17 00:00:00 2001
From: freef <freef@example.com>
Date: Thu, 30 Jul 2026 10:06:08 -0700
Subject: [PATCH 2/2] Fix ContractBase inheritance in CrossChainBridge

---
 src/contracts/CrossChainBridge.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/contracts/CrossChainBridge.h b/src/contracts/CrossChainBridge.h
index 5ffde369b..bfa2e7b43 100644
--- a/src/contracts/CrossChainBridge.h
+++ b/src/contracts/CrossChainBridge.h
@@ -7,7 +7,7 @@
 #define CCB_MAX_VALIDATORS 16
 #define CCB_REPLAY_BUFFER_SIZE 256
 
-struct CROSSCHAINBRIDGE {
+struct CROSSCHAINBRIDGE : public ContractBase {
     id contractOwner;
     uint8 isPaused;
     uint64 totalLockedQus;