diff --git a/programs/openbook-v2/src/instructions/cancel_all_and_place_orders.rs b/programs/openbook-v2/src/instructions/cancel_all_and_place_orders.rs
index 5035e67a1..5f0f8d556 100644
--- a/programs/openbook-v2/src/instructions/cancel_all_and_place_orders.rs
+++ b/programs/openbook-v2/src/instructions/cancel_all_and_place_orders.rs
@@ -88,6 +88,7 @@ pub fn cancel_all_and_place_orders(
         } = book.new_order(
             order,
             &mut market,
+            &ctx.accounts.market.key(),
             &mut event_heap,
             oracle_price,
             Some(&mut open_orders_account),
diff --git a/programs/openbook-v2/src/instructions/place_order.rs b/programs/openbook-v2/src/instructions/place_order.rs
index 15428c5aa..da09cde2e 100644
--- a/programs/openbook-v2/src/instructions/place_order.rs
+++ b/programs/openbook-v2/src/instructions/place_order.rs
@@ -59,6 +59,7 @@ pub fn place_order(ctx: Context<PlaceOrder>, order: Order, limit: u8) -> Result<
     } = book.new_order(
         &order,
         &mut market,
+        &ctx.accounts.market.key(),
         &mut event_heap,
         oracle_price,
         Some(&mut open_orders_account),
diff --git a/programs/openbook-v2/src/instructions/place_take_order.rs b/programs/openbook-v2/src/instructions/place_take_order.rs
index 83264205b..bad71804a 100644
--- a/programs/openbook-v2/src/instructions/place_take_order.rs
+++ b/programs/openbook-v2/src/instructions/place_take_order.rs
@@ -50,6 +50,7 @@ pub fn place_take_order(ctx: Context<PlaceTakeOrder>, order: Order, limit: u8) -
     } = book.new_order(
         &order,
         &mut market,
+        &ctx.accounts.market.key(),
         &mut event_heap,
         oracle_price,
         None,
diff --git a/programs/openbook-v2/src/logs.rs b/programs/openbook-v2/src/logs.rs
index 0a52da46d..32e260a53 100644
--- a/programs/openbook-v2/src/logs.rs
+++ b/programs/openbook-v2/src/logs.rs
@@ -33,7 +33,6 @@ pub struct FillLog {
     pub quantity: i64, // number of base lots
 }
 
-
 #[event]
 pub struct PlaceOrderLog {
     pub open_orders_account: Pubkey,
@@ -41,6 +40,12 @@ pub struct PlaceOrderLog {
     pub timestamp: u64,
 }
 
+#[event]
+pub struct TakerSignatureLog {
+    pub market: Pubkey,
+    pub seq_num: u64,
+}
+
 #[event]
 pub struct MarketMetaDataLog {
     pub market: Pubkey,
diff --git a/programs/openbook-v2/src/state/open_orders_account.rs b/programs/openbook-v2/src/state/open_orders_account.rs
index e462c143a..7fb498c2f 100644
--- a/programs/openbook-v2/src/state/open_orders_account.rs
+++ b/programs/openbook-v2/src/state/open_orders_account.rs
@@ -211,7 +211,7 @@ impl OpenOrdersAccount {
             maker_slot: fill.maker_slot,
             maker_out: fill.maker_out(),
             timestamp: fill.timestamp,
-            seq_num: fill.seq_num,
+            seq_num: fill.market_seq_num,
             maker: fill.maker,
             maker_client_order_id: fill.maker_client_order_id,
             maker_fee: maker_fees,
diff --git a/programs/openbook-v2/src/state/orderbook/book.rs b/programs/openbook-v2/src/state/orderbook/book.rs
index 1aa1040fa..7eaada168 100644
--- a/programs/openbook-v2/src/state/orderbook/book.rs
+++ b/programs/openbook-v2/src/state/orderbook/book.rs
@@ -63,6 +63,7 @@ impl<'a> Orderbook<'a> {
         &mut self,
         order: &Order,
         open_book_market: &mut Market,
+        market_pk: &Pubkey,
         event_heap: &mut EventHeap,
         oracle_price: Option<I80F48>,
         mut open_orders_account: Option<&mut OpenOrdersAccount>,
@@ -235,7 +236,7 @@ impl<'a> Orderbook<'a> {
                 maker_out,
                 best_opposing.node.owner_slot,
                 now_ts,
-                event_heap.header.seq_num,
+                market.seq_num,
                 best_opposing.node.owner,
                 best_opposing.node.client_order_id,
                 best_opposing.node.timestamp,
@@ -246,6 +247,11 @@ impl<'a> Orderbook<'a> {
                 match_base_lots,
             );
 
+            emit!(TakerSignatureLog {
+                market: *market_pk,
+                seq_num: market.seq_num,
+            });
+
             process_fill_event(
                 fill,
                 market,
diff --git a/programs/openbook-v2/src/state/orderbook/heap.rs b/programs/openbook-v2/src/state/orderbook/heap.rs
index 1d705bb23..d2ef2452e 100644
--- a/programs/openbook-v2/src/state/orderbook/heap.rs
+++ b/programs/openbook-v2/src/state/orderbook/heap.rs
@@ -243,7 +243,7 @@ pub struct FillEvent {
     pub maker_slot: u8,
     pub padding: [u8; 4],
     pub timestamp: u64,
-    pub seq_num: u64,
+    pub market_seq_num: u64,
 
     pub maker: Pubkey,
 
@@ -269,7 +269,7 @@ impl FillEvent {
         maker_out: bool,
         maker_slot: u8,
         timestamp: u64,
-        seq_num: u64,
+        market_seq_num: u64,
         maker: Pubkey,
         maker_client_order_id: u64,
         maker_timestamp: u64,
@@ -285,7 +285,7 @@ impl FillEvent {
             maker_out: maker_out.into(),
             maker_slot,
             timestamp,
-            seq_num,
+            market_seq_num,
             maker,
             maker_client_order_id,
             maker_timestamp,