From 2769fed744c4ec5a2cf6581addfc1704abfcba7c Mon Sep 17 00:00:00 2001
From: Siddharth Suresh <siddharth@stellar.org>
Date: Wed, 24 Jun 2026 18:59:00 -0700
Subject: [PATCH] Add CAP-0084 muxed contract address XDR

Adds the SC_ADDRESS_TYPE_MUXED_CONTRACT arm to SCAddress with a new
MuxedContract { uint64 id; ContractID contractId; } struct, mirroring
MuxedEd25519Account. Gated behind #ifdef CAP_0084 so it lands in `next`
only until core bumps the max supported protocol.

CAP-0084: https://github.com/stellar/stellar-protocol/pull/1968
---
 Stellar-contract.x | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Stellar-contract.x b/Stellar-contract.x
index 0e67dc3..a5e844a 100644
--- a/Stellar-contract.x
+++ b/Stellar-contract.x
@@ -183,6 +183,10 @@ enum SCAddressType
     SC_ADDRESS_TYPE_MUXED_ACCOUNT = 2,
     SC_ADDRESS_TYPE_CLAIMABLE_BALANCE = 3,
     SC_ADDRESS_TYPE_LIQUIDITY_POOL = 4
+#ifdef CAP_0084
+    ,
+    SC_ADDRESS_TYPE_MUXED_CONTRACT = 5
+#endif
 };
 
 struct MuxedEd25519Account
@@ -191,6 +195,14 @@ struct MuxedEd25519Account
     uint256 ed25519;
 };
 
+#ifdef CAP_0084
+struct MuxedContract
+{
+    uint64 id;
+    ContractID contractId;
+};
+#endif
+
 union SCAddress switch (SCAddressType type)
 {
 case SC_ADDRESS_TYPE_ACCOUNT:
@@ -203,6 +215,10 @@ case SC_ADDRESS_TYPE_CLAIMABLE_BALANCE:
     ClaimableBalanceID claimableBalanceId;
 case SC_ADDRESS_TYPE_LIQUIDITY_POOL:
     PoolID liquidityPoolId;
+#ifdef CAP_0084
+case SC_ADDRESS_TYPE_MUXED_CONTRACT:
+    MuxedContract muxedContract;
+#endif
 };
 
 %struct SCVal;