From 081efc7940f4eeac0d3dc9a1ec8f555db80b96e3 Mon Sep 17 00:00:00 2001
From: Eitan Seri- Levi <eserilev@gmail.com>
Date: Mon, 9 Feb 2026 20:42:47 -0800
Subject: [PATCH] Fix sig domain

---
 validator_client/lighthouse_validator_store/src/lib.rs   | 6 +++++-
 validator_client/signing_method/src/web3signer.rs        | 1 +
 validator_client/validator_services/src/block_service.rs | 7 +++++--
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/validator_client/lighthouse_validator_store/src/lib.rs b/validator_client/lighthouse_validator_store/src/lib.rs
index c3c61751d0..5820dd89e6 100644
--- a/validator_client/lighthouse_validator_store/src/lib.rs
+++ b/validator_client/lighthouse_validator_store/src/lib.rs
@@ -1250,7 +1250,11 @@ impl<T: SlotClock + 'static, E: EthSpec> ValidatorStore for LighthouseValidatorS
         validator_pubkey: PublicKeyBytes,
         envelope: ExecutionPayloadEnvelope<E>,
     ) -> Result<SignedExecutionPayloadEnvelope<E>, Error> {
-        let domain_hash = self.spec.get_builder_domain();
+        let signing_context = self.signing_context(
+            Domain::BeaconBuilder,
+            envelope.slot.epoch(E::slots_per_epoch()),
+        );
+        let domain_hash = signing_context.domain_hash(&self.spec);
         let signing_root = envelope.signing_root(domain_hash);
 
         // Execution payload envelope signing is not slashable, bypass doppelganger protection.
diff --git a/validator_client/signing_method/src/web3signer.rs b/validator_client/signing_method/src/web3signer.rs
index 7bf953aaeb..e6fc8f3ba2 100644
--- a/validator_client/signing_method/src/web3signer.rs
+++ b/validator_client/signing_method/src/web3signer.rs
@@ -19,6 +19,7 @@ pub enum MessageType {
     SyncCommitteeSelectionProof,
     SyncCommitteeContributionAndProof,
     ValidatorRegistration,
+    // TODO(gloas) verify w/ web3signer specs
     ExecutionPayloadEnvelope,
 }
 
diff --git a/validator_client/validator_services/src/block_service.rs b/validator_client/validator_services/src/block_service.rs
index 649f0e09cc..ec6391b7d4 100644
--- a/validator_client/validator_services/src/block_service.rs
+++ b/validator_client/validator_services/src/block_service.rs
@@ -5,7 +5,6 @@ use eth2::{BeaconNodeHttpClient, StatusCode};
 use graffiti_file::{GraffitiFile, determine_graffiti};
 use logging::crit;
 use slot_clock::SlotClock;
-use types::consts::gloas::BUILDER_INDEX_SELF_BUILD;
 use std::fmt::Debug;
 use std::future::Future;
 use std::ops::Deref;
@@ -14,6 +13,7 @@ use std::time::Duration;
 use task_executor::TaskExecutor;
 use tokio::sync::mpsc;
 use tracing::{Instrument, debug, error, info, info_span, instrument, trace, warn};
+use types::consts::gloas::BUILDER_INDEX_SELF_BUILD;
 use types::{BlockType, ChainSpec, EthSpec, Graffiti, Slot};
 use validator_store::{Error as ValidatorStoreError, SignedBlock, UnsignedBlock, ValidatorStore};
 
@@ -650,7 +650,10 @@ impl<S: ValidatorStore + 'static, T: SlotClock + 'static> BlockService<S, T> {
         let envelope = proposer_fallback
             .request_proposers_last(|beacon_node| async move {
                 beacon_node
-                    .get_validator_execution_payload_envelope::<S::E>(slot, BUILDER_INDEX_SELF_BUILD)
+                    .get_validator_execution_payload_envelope::<S::E>(
+                        slot,
+                        BUILDER_INDEX_SELF_BUILD,
+                    )
                     .await
                     .map(|response| response.data)
                     .map_err(|e| {