diff --git a/lib/bcoin/mempool.js b/lib/bcoin/mempool.js
index 86512a5e..121ef3fd 100644
--- a/lib/bcoin/mempool.js
+++ b/lib/bcoin/mempool.js
@@ -205,36 +205,72 @@ Mempool.prototype.addBlock = function addBlock(block, callback, force) {
 
   callback = utils.wrap(callback, unlock);
 
-  utils.forEachSerial(block.txs, function(tx, next) {
-    var hash = tx.hash('hex');
-    var copy;
+  // We add the txs we haven't seen to
+  // the mempool first to potentially
+  // resolve orphans.
+  utils.forEachSerial(block.txs,  function(tx, next) {
+    var hash, copy;
+
+    if (!self.chain.isFull())
+      return next();
 
     if (tx.isCoinbase())
       return next();
 
-    self.getTX(hash, function(err, existing) {
+    hash = tx.hash('hex');
+
+    self.hasTX(hash, function(err, exists) {
       if (err)
-        return callback(err);
+        return next(err);
 
-      if (!existing)
-        return self.removeOrphan(hash, next);
+      if (exists)
+        return next();
 
-      copy = tx.clone();
-      copy.ts = existing.ts;
-      copy.block = existing.block;
-      copy.height = existing.height;
-      copy.ps = existing.ps;
-
-      self.removeUnchecked(copy, function(err) {
+      self.removeOrphan(hash, function(err) {
         if (err)
           return next(err);
 
-        self.emit('confirmed', tx, block);
+        copy = tx.clone();
+        copy.unsetBlock();
 
-        return next();
+        self.addUnchecked(tx, next);
       });
     });
-  }, callback);
+  }, function(err) {
+    if (err)
+      return callback(err);
+
+    utils.forEachSerial(block.txs.slice().reverse(), function(tx, next) {
+      var hash = tx.hash('hex');
+      var copy;
+
+      if (tx.isCoinbase())
+        return next();
+
+      self.getTX(hash, function(err, existing) {
+        if (err)
+          return next(err);
+
+        if (!existing)
+          return self.removeOrphan(hash, next);
+
+        copy = tx.clone();
+        copy.ts = existing.ts;
+        copy.block = existing.block;
+        copy.height = existing.height;
+        copy.ps = existing.ps;
+
+        self.removeUnchecked(copy, function(err) {
+          if (err)
+            return next(err);
+
+          self.emit('confirmed', tx, block);
+
+          return next();
+        });
+      });
+    }, callback);
+  });
 };
 
 /**
@@ -253,7 +289,7 @@ Mempool.prototype.removeBlock = function removeBlock(block, callback, force) {
 
   callback = utils.wrap(callback, unlock);
 
-  utils.forEachSerial(block.txs.slice().reverse(), function(tx, next) {
+  utils.forEachSerial(block.txs, function(tx, next) {
     var copy;
 
     if (tx.isCoinbase())
diff --git a/lib/bcoin/protocol/network.js b/lib/bcoin/protocol/network.js
index e15d6e88..b8ccbb11 100644
--- a/lib/bcoin/protocol/network.js
+++ b/lib/bcoin/protocol/network.js
@@ -509,7 +509,7 @@ testnet.block = {
   pruneAfterHeight: 1000,
   // maxTipAge: 0x7fffffff
   maxTipAge: 24 * 60 * 60,
-  slowHeight: 500000
+  slowHeight: 750000
 };
 
 testnet.witness = false;