diff --git a/libraries/fc b/libraries/fc
index b3816115eb5..4dc8375d7d3 160000
--- a/libraries/fc
+++ b/libraries/fc
@@ -1 +1 @@
-Subproject commit b3816115eb5452dbce1c62c0cb7c2d98233ae0f2
+Subproject commit 4dc8375d7d3e02ab1177ab5c22835f75b45c845a
diff --git a/libraries/wabt b/libraries/wabt
index 270e1f9ee63..e7d6948d242 160000
--- a/libraries/wabt
+++ b/libraries/wabt
@@ -1 +1 @@
-Subproject commit 270e1f9ee63004578c82a2fe594b81afd84c1631
+Subproject commit e7d6948d242a9931436c38275d59a9c6036c4095
diff --git a/plugins/history_plugin/history_plugin.cpp b/plugins/history_plugin/history_plugin.cpp
index 2911d4dc240..3c3650b9e59 100644
--- a/plugins/history_plugin/history_plugin.cpp
+++ b/plugins/history_plugin/history_plugin.cpp
@@ -10,7 +10,7 @@
 #include <boost/algorithm/string.hpp>
 #include <boost/signals2/connection.hpp>
 
-namespace eosio { 
+namespace eosio {
    using namespace chain;
    using boost::signals2::scoped_connection;
 
@@ -51,7 +51,7 @@ namespace eosio {
       indexed_by<
          ordered_unique<tag<by_id>, member<action_history_object, action_history_object::id_type, &action_history_object::id>>,
          ordered_unique<tag<by_action_sequence_num>, member<action_history_object, uint64_t, &action_history_object::action_sequence_num>>,
-         ordered_unique<tag<by_trx_id>, 
+         ordered_unique<tag<by_trx_id>,
             composite_key< action_history_object,
                member<action_history_object, transaction_id_type, &action_history_object::trx_id>,
                member<action_history_object, uint64_t, &action_history_object::action_sequence_num >
@@ -64,7 +64,7 @@ namespace eosio {
       account_history_object,
       indexed_by<
          ordered_unique<tag<by_id>, member<account_history_object, account_history_object::id_type, &account_history_object::id>>,
-         ordered_unique<tag<by_account_action_seq>, 
+         ordered_unique<tag<by_account_action_seq>,
             composite_key< account_history_object,
                member<account_history_object, account_name, &account_history_object::account >,
                member<account_history_object, int32_t, &account_history_object::account_sequence_num >
@@ -213,7 +213,7 @@ namespace eosio {
 
             uint64_t asn = 0;
             if( itr != idx.begin() ) --itr;
-            if( itr->account == n ) 
+            if( itr->account == n )
                asn = itr->account_sequence_num + 1;
 
             //idump((n)(act.receipt.global_sequence)(asn));
@@ -268,7 +268,7 @@ namespace eosio {
                   aho.block_time = chain.pending_block_time();
                   aho.trx_id     = at.trx_id;
                });
-               
+
                auto aset = account_set( at );
                for( auto a : aset ) {
                   record_account_action( a, at );
@@ -366,7 +366,7 @@ namespace eosio {
 
 
 
-   namespace history_apis { 
+   namespace history_apis {
       read_only::get_actions_result read_only::get_actions( const read_only::get_actions_params& params )const {
          edump((params));
         auto& chain = history->chain_plug->chain();
@@ -388,7 +388,7 @@ namespace eosio {
                   pos = itr->account_sequence_num+1;
             } else if( itr != idx.begin() ) --itr;
 
-            if( itr->account == n ) 
+            if( itr->account == n )
                pos = itr->account_sequence_num + 1;
         }
 
@@ -440,13 +440,31 @@ namespace eosio {
       read_only::get_transaction_result read_only::get_transaction( const read_only::get_transaction_params& p )const {
          auto& chain = history->chain_plug->chain();
          const auto abi_serializer_max_time = history->chain_plug->get_abi_serializer_max_time();
-         auto short_id = fc::variant(p.id).as_string().substr(0,8);
+
+         transaction_id_type input_id;
+         auto input_id_length = p.id.size();
+         try {
+            FC_ASSERT( input_id_length <= 64, "hex string is too long to represent an actual transaction id" );
+            FC_ASSERT( input_id_length >= 8,  "hex string representing transaction id should be at least 8 characters long to avoid excessive collisions" );
+            input_id = transaction_id_type(p.id);
+         } EOS_RETHROW_EXCEPTIONS(transaction_id_type_exception, "Invalid transaction ID: ${transaction_id}", ("transaction_id", p.id))
+
+         auto txn_id_matched = [&input_id, input_id_size = input_id_length/2, no_half_byte_at_end = (input_id_length % 2 == 0)]
+                               ( const transaction_id_type &id ) -> bool // hex prefix comparison
+         {
+            bool whole_byte_prefix_matches = memcmp( input_id.data(), id.data(), input_id_size ) == 0;
+            if( !whole_byte_prefix_matches || no_half_byte_at_end )
+               return whole_byte_prefix_matches;
+
+            // check if half byte at end of specified part of input_id matches
+            return (*(input_id.data() + input_id_size) & 0xF0) == (*(id.data() + input_id_size) & 0xF0);
+         };
 
          const auto& db = chain.db();
          const auto& idx = db.get_index<action_history_index, by_trx_id>();
-         auto itr = idx.lower_bound( boost::make_tuple(p.id) );
+         auto itr = idx.lower_bound( boost::make_tuple( input_id ) );
 
-         bool in_history = (itr != idx.end() && fc::variant(itr->trx_id).as_string().substr(0,8) == short_id );
+         bool in_history = (itr != idx.end() && txn_id_matched(itr->trx_id) );
 
          if( !in_history && !p.block_num_hint ) {
             EOS_THROW(tx_not_found, "Transaction ${id} not found in history and no block hint was given", ("id",p.id));
@@ -454,12 +472,9 @@ namespace eosio {
 
          get_transaction_result result;
 
-         if (in_history) {
-            result.id = p.id;
-            result.last_irreversible_block = chain.last_irreversible_block_num();
-
-
+         if( in_history ) {
             result.id         = itr->trx_id;
+            result.last_irreversible_block = chain.last_irreversible_block_num();
             result.block_num  = itr->block_num;
             result.block_time = itr->block_time;
 
@@ -509,7 +524,7 @@ namespace eosio {
                   if (receipt.trx.contains<packed_transaction>()) {
                      auto& pt = receipt.trx.get<packed_transaction>();
                      auto mtrx = transaction_metadata(pt);
-                     if (fc::variant(mtrx.id).as_string().substr(0, 8) == short_id) {
+                     if( txn_id_matched(mtrx.id) ) {
                         result.id = mtrx.id;
                         result.last_irreversible_block = chain.last_irreversible_block_num();
                         result.block_num = *p.block_num_hint;
@@ -522,7 +537,7 @@ namespace eosio {
                      }
                   } else {
                      auto& id = receipt.trx.get<transaction_id_type>();
-                     if (fc::variant(id).as_string().substr(0, 8) == short_id) {
+                     if( txn_id_matched(id) ) {
                         result.id = id;
                         result.last_irreversible_block = chain.last_irreversible_block_num();
                         result.block_num = *p.block_num_hint;
diff --git a/plugins/history_plugin/include/eosio/history_plugin/history_plugin.hpp b/plugins/history_plugin/include/eosio/history_plugin/history_plugin.hpp
index 402c0e3966d..b6801b30a29 100644
--- a/plugins/history_plugin/include/eosio/history_plugin/history_plugin.hpp
+++ b/plugins/history_plugin/include/eosio/history_plugin/history_plugin.hpp
@@ -30,18 +30,6 @@ class read_only {
          : history(history) {}
 
 
-      /*
-      struct get_transaction_params {
-         chain::transaction_id_type  transaction_id;
-      };
-      struct get_transaction_results {
-         chain::transaction_id_type  transaction_id;
-         fc::variant                 transaction;
-      };
-      get_transaction_results get_transaction(const get_transaction_params& params) const;
-      */
-
-
       struct get_actions_params {
          chain::account_name account_name;
          optional<int32_t>   pos; /// a absolute sequence positon -1 is the end/last action
@@ -67,7 +55,7 @@ class read_only {
 
 
       struct get_transaction_params {
-         transaction_id_type           id;
+         string                        id;
          optional<uint32_t>            block_num_hint;
       };
 
@@ -81,7 +69,7 @@ class read_only {
       };
 
       get_transaction_result get_transaction( const get_transaction_params& )const;
-      
+
 
 
 
@@ -120,13 +108,13 @@ class read_only {
 
 /**
  *  This plugin tracks all actions and keys associated with a set of configured accounts. It enables
- *  wallets to paginate queries for history.  
+ *  wallets to paginate queries for history.
  *
  *  An action will be included in the account's history if any of the following:
  *     - receiver
  *     - any account named in auth list
  *
- *  A key will be linked to an account if the key is referneced in authorities of updateauth or newaccount 
+ *  A key will be linked to an account if the key is referneced in authorities of updateauth or newaccount
  */
 class history_plugin : public plugin<history_plugin> {
    public:
diff --git a/programs/cleos/main.cpp b/programs/cleos/main.cpp
index 49b38d13a37..b4acd6faf72 100644
--- a/programs/cleos/main.cpp
+++ b/programs/cleos/main.cpp
@@ -2133,12 +2133,7 @@ int main( int argc, char** argv ) {
    getTransaction->add_option("id", transaction_id_str, localized("ID of the transaction to retrieve"))->required();
    getTransaction->add_option( "-b,--block-hint", block_num_hint, localized("the block number this transaction may be in") );
    getTransaction->set_callback([&] {
-      transaction_id_type transaction_id;
-      try {
-         while( transaction_id_str.size() < 64 ) transaction_id_str += "0";
-         transaction_id = transaction_id_type(transaction_id_str);
-      } EOS_RETHROW_EXCEPTIONS(transaction_id_type_exception, "Invalid transaction ID: ${transaction_id}", ("transaction_id", transaction_id_str))
-      auto arg= fc::mutable_variant_object( "id", transaction_id);
+      auto arg= fc::mutable_variant_object( "id", transaction_id_str);
       if ( block_num_hint > 0 ) {
          arg = arg("block_num_hint", block_num_hint);
       }