diff --git a/crates/types/network/src/error_trace.rs b/crates/types/network/src/error_trace.rs
index b75d127..c3c8238 100644
--- a/crates/types/network/src/error_trace.rs
+++ b/crates/types/network/src/error_trace.rs
@@ -20,9 +20,10 @@
 //!
 //! SYNC: this is a manually-kept duplicate of the canonical module in
 //! `succinctlabs/network-services` (PR #1191). The two proto repos are not
-//! auto-synced; `FailFulfillmentRequestBody.error_trace` is wire field 4 in
-//! both. Keep this file and its network-services twin logically identical —
-//! change them together.
+//! auto-synced; `FailFulfillmentRequestBody.error_trace` is wire field 4 and
+//! `ExecuteProofRequestBody.error_trace` is wire field 11 in both repos. Keep
+//! this file and its network-services twin logically identical — change them
+//! together.
 
 use serde::{Deserialize, Serialize};
 
diff --git a/crates/types/network/src/types.rs b/crates/types/network/src/types.rs
index 37fe7d6..a84d84a 100644
--- a/crates/types/network/src/types.rs
+++ b/crates/types/network/src/types.rs
@@ -290,6 +290,12 @@ pub struct ExecuteProofRequestBody {
     /// The variant of the transaction.
     #[prost(enumeration = "TransactionVariant", tag = "10")]
     pub variant: i32,
+    /// Optional bounded, sanitized structured failure trace, set when execution
+    /// failed. Same contract as FailFulfillmentRequestBody.error_trace: the network
+    /// re-validates and stores it in `requests.error_trace`. See
+    /// `spn_network_types::error_trace`.
+    #[prost(bytes = "vec", optional, tag = "11")]
+    pub error_trace: ::core::option::Option<::prost::alloc::vec::Vec<u8>>,
 }
 #[derive(serde::Serialize, serde::Deserialize)]
 #[derive(Clone, PartialEq, ::prost::Message)]
diff --git a/crates/vapp/tests/common/mod.rs b/crates/vapp/tests/common/mod.rs
index 3573192..e767fcf 100644
--- a/crates/vapp/tests/common/mod.rs
+++ b/crates/vapp/tests/common/mod.rs
@@ -651,6 +651,7 @@ pub fn create_clear_tx_with_options(
         punishment: None,
         failure_cause: None,
         variant: TransactionVariant::ExecuteVariant as i32,
+        error_trace: None,
     };
 
     // Create and sign execute.
@@ -963,6 +964,7 @@ pub fn create_clear_tx_with_public_values_hash(
         punishment: None,
         failure_cause: None,
         variant: TransactionVariant::ExecuteVariant as i32,
+        error_trace: None,
     };
 
     // Create and sign execute.
@@ -1170,6 +1172,7 @@ pub fn create_clear_tx_with_version(
         punishment: None,
         failure_cause: None,
         variant: TransactionVariant::ExecuteVariant as i32,
+        error_trace: None,
     };
 
     // Create and sign execute.
diff --git a/proto/types.proto b/proto/types.proto
index f2e2e82..b157630 100644
--- a/proto/types.proto
+++ b/proto/types.proto
@@ -235,6 +235,11 @@ message ExecuteProofRequestBody {
   optional ExecuteFailureCause failure_cause = 9;
   // The variant of the transaction.
   TransactionVariant variant = 10;
+  // Optional bounded, sanitized structured failure trace, set when execution
+  // failed. Same contract as FailFulfillmentRequestBody.error_trace: the network
+  // re-validates and stores it in `requests.error_trace`. See
+  // `spn_network_types::error_trace`.
+  optional bytes error_trace = 11;
 }
 
 message ExecuteProofResponse {