diff --git a/Cargo.lock b/Cargo.lock
index 13099d14ac..f48408c270 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -4936,6 +4936,7 @@ dependencies = [
  "futures",
  "hotshot-types",
  "serde",
+ "serde_json",
  "tagged-base64",
  "thiserror 1.0.69",
  "tide-disco",
diff --git a/hotshot-builder-api/Cargo.toml b/hotshot-builder-api/Cargo.toml
index a948e2b270..8344032d2b 100644
--- a/hotshot-builder-api/Cargo.toml
+++ b/hotshot-builder-api/Cargo.toml
@@ -13,6 +13,7 @@ derive_more = { workspace = true, features = ["from"] }
 futures = { workspace = true }
 hotshot-types = { workspace = true }
 serde = { workspace = true }
+serde_json = { workspace = true }
 tagged-base64 = { workspace = true }
 thiserror = { workspace = true }
 tide-disco = { workspace = true }
diff --git a/hotshot-builder-api/src/v0_1/block_info.rs b/hotshot-builder-api/src/v0_1/block_info.rs
index 0006140900..f0d9219d88 100644
--- a/hotshot-builder-api/src/v0_1/block_info.rs
+++ b/hotshot-builder-api/src/v0_1/block_info.rs
@@ -48,6 +48,8 @@ impl<TYPES: NodeType> AvailableBlockData<TYPES> {
 #[serde(bound = "")]
 pub struct AvailableBlockHeaderInput<TYPES: NodeType> {
     pub vid_commitment: VidCommitment,
+    #[serde(default)]
+    pub vid_precompute_data: Option<serde_json::Value>,
     // signature over vid_commitment, BlockPayload::Metadata, and offered_fee
     pub fee_signature:
         <<TYPES as NodeType>::BuilderSignatureKey as BuilderSignatureKey>::BuilderSignature,
diff --git a/hotshot-builder-core-refactored/src/service.rs b/hotshot-builder-core-refactored/src/service.rs
index 046af22089..5d27b2611f 100644
--- a/hotshot-builder-core-refactored/src/service.rs
+++ b/hotshot-builder-core-refactored/src/service.rs
@@ -606,6 +606,7 @@ where
 
         let response = AvailableBlockHeaderInput::<Types> {
             vid_commitment,
+            vid_precompute_data: None,
             fee_signature: signature_over_fee_info,
             message_signature: signature_over_vid_commitment,
             sender: self.builder_keys.0.clone(),
diff --git a/hotshot-builder-core/src/service.rs b/hotshot-builder-core/src/service.rs
index ab41c0c5a2..efe47cc626 100644
--- a/hotshot-builder-core/src/service.rs
+++ b/hotshot-builder-core/src/service.rs
@@ -998,6 +998,7 @@ impl<Types: NodeType> ProxyGlobalState<Types> {
 
                     let response = AvailableBlockHeaderInput::<Types> {
                         vid_commitment,
+                        vid_precompute_data: None,
                         fee_signature: signature_over_fee_info,
                         message_signature: signature_over_vid_commitment,
                         sender: pub_key.clone(),
diff --git a/hotshot-testing/src/block_builder/mod.rs b/hotshot-testing/src/block_builder/mod.rs
index 10e1cf6aed..e1c1d06738 100644
--- a/hotshot-testing/src/block_builder/mod.rs
+++ b/hotshot-testing/src/block_builder/mod.rs
@@ -228,6 +228,7 @@ where
     };
     let header_input = AvailableBlockHeaderInput {
         vid_commitment,
+        vid_precompute_data: None,
         message_signature: signature_over_vid_commitment.clone(),
         fee_signature: signature_over_fee_info,
         sender: pub_key,
diff --git a/sequencer-sqlite/Cargo.lock b/sequencer-sqlite/Cargo.lock
index 7b6c26a3aa..274d52ead5 100644
--- a/sequencer-sqlite/Cargo.lock
+++ b/sequencer-sqlite/Cargo.lock
@@ -4744,6 +4744,7 @@ dependencies = [
  "futures",
  "hotshot-types",
  "serde",
+ "serde_json",
  "tagged-base64",
  "thiserror 1.0.69",
  "tide-disco",