diff --git a/libraries/chain/include/eosio/chain/transaction_metadata.hpp b/libraries/chain/include/eosio/chain/transaction_metadata.hpp
index 5f2be488dc8..60f89e2c4fe 100644
--- a/libraries/chain/include/eosio/chain/transaction_metadata.hpp
+++ b/libraries/chain/include/eosio/chain/transaction_metadata.hpp
@@ -51,7 +51,7 @@ class transaction_metadata {
 
       const flat_set<public_key_type>& recover_keys( const chain_id_type& chain_id );
 
-      static void create_signing_keys_future( transaction_metadata_ptr& mtrx,
+      static void create_signing_keys_future( const transaction_metadata_ptr& mtrx,
                                               boost::asio::thread_pool& thread_pool, const chain_id_type& chain_id );
 
       uint32_t total_actions()const { return trx.context_free_actions.size() + trx.actions.size(); }
diff --git a/libraries/chain/transaction.cpp b/libraries/chain/transaction.cpp
index 6e6639bac52..d2528dc21a3 100644
--- a/libraries/chain/transaction.cpp
+++ b/libraries/chain/transaction.cpp
@@ -95,9 +95,10 @@ flat_set<public_key_type> transaction::get_signature_keys( const vector<signatur
       public_key_type recov;
       if( use_cache ) {
          recovery_cache_type::index<by_sig>::type::iterator it = recovery_cache.get<by_sig>().find( sig );
-         if( it == recovery_cache.get<by_sig>().end() || it->trx_id != id()) {
+         const auto& tid = id();
+         if( it == recovery_cache.get<by_sig>().end() || it->trx_id != tid) {
             recov = public_key_type( sig, digest );
-            recovery_cache.emplace_back(cached_pub_key{id(), recov, sig} ); //could fail on dup signatures; not a problem
+            recovery_cache.emplace_back(cached_pub_key{tid, recov, sig} ); //could fail on dup signatures; not a problem
          } else {
             recov = it->pub_key;
          }
diff --git a/libraries/chain/transaction_metadata.cpp b/libraries/chain/transaction_metadata.cpp
index 9afc1a01fd0..068f711f6b0 100644
--- a/libraries/chain/transaction_metadata.cpp
+++ b/libraries/chain/transaction_metadata.cpp
@@ -19,8 +19,14 @@ const flat_set<public_key_type>& transaction_metadata::recover_keys( const chain
    return signing_keys->second;
 }
 
-void transaction_metadata::create_signing_keys_future( transaction_metadata_ptr& mtrx,
+void transaction_metadata::create_signing_keys_future( const transaction_metadata_ptr& mtrx,
                                                        boost::asio::thread_pool& thread_pool, const chain_id_type& chain_id ) {
+   if( mtrx->signing_keys && mtrx->signing_keys->first == chain_id )
+      return;
+
+   if( mtrx->signing_keys.valid() ) // already created
+      return;
+
    std::weak_ptr<transaction_metadata> mtrx_wp = mtrx;
    mtrx->signing_keys_future = async_thread_pool( thread_pool, [chain_id, mtrx_wp]() {
       auto mtrx = mtrx_wp.lock();
diff --git a/plugins/producer_plugin/producer_plugin.cpp b/plugins/producer_plugin/producer_plugin.cpp
index 1a1d7d0d515..d0bda3edf0a 100644
--- a/plugins/producer_plugin/producer_plugin.cpp
+++ b/plugins/producer_plugin/producer_plugin.cpp
@@ -346,6 +346,18 @@ class producer_plugin_impl : public std::enable_shared_from_this<producer_plugin
       std::deque<std::tuple<transaction_metadata_ptr, bool, next_function<transaction_trace_ptr>>> _pending_incoming_transactions;
 
       void on_incoming_transaction_async(const transaction_metadata_ptr& trx, bool persist_until_expired, next_function<transaction_trace_ptr> next) {
+         chain::controller& chain = chain_plug->chain();
+         transaction_metadata::create_signing_keys_future( trx, chain.get_thread_pool(), chain.get_chain_id() );
+         boost::asio::post( chain.get_thread_pool(), [self = this, trx, persist_until_expired, next]() {
+            if( trx->signing_keys_future.valid() )
+               trx->signing_keys_future.wait();
+            app().get_io_service().post( [self, trx, persist_until_expired, next]() {
+               self->process_incoming_transaction_async( trx, persist_until_expired, next );
+            });
+         });
+      }
+
+      void process_incoming_transaction_async(const transaction_metadata_ptr& trx, bool persist_until_expired, next_function<transaction_trace_ptr> next) {
          chain::controller& chain = chain_plug->chain();
          if (!chain.pending_block_state()) {
             _pending_incoming_transactions.emplace_back(trx, persist_until_expired, next);
@@ -1245,7 +1257,7 @@ producer_plugin_impl::start_block_result producer_plugin_impl::start_block(bool
                      _pending_incoming_transactions.pop_front();
                      --orig_pending_txn_size;
                      _incoming_trx_weight -= 1.0;
-                     on_incoming_transaction_async(std::get<0>(e), std::get<1>(e), std::get<2>(e));
+                     process_incoming_transaction_async(std::get<0>(e), std::get<1>(e), std::get<2>(e));
                   }
 
                   if (block_time <= fc::time_point::now()) {
@@ -1308,7 +1320,7 @@ producer_plugin_impl::start_block_result producer_plugin_impl::start_block(bool
                   auto e = _pending_incoming_transactions.front();
                   _pending_incoming_transactions.pop_front();
                   --orig_pending_txn_size;
-                  on_incoming_transaction_async(std::get<0>(e), std::get<1>(e), std::get<2>(e));
+                  process_incoming_transaction_async(std::get<0>(e), std::get<1>(e), std::get<2>(e));
                   if (block_time <= fc::time_point::now()) return start_block_result::exhausted;
                }
             }