diff --git a/api.php b/api.php
index 91eab9e..fd48c88 100755
--- a/api.php
+++ b/api.php
@@ -101,6 +101,9 @@ elseif($q=="getPublicKey"){
      api_echo(VERSION);
 
 } elseif($q=="send"){
+    $current=$block->current();
+
+    if($current['height']>10790&&$current['height']<10810) api_err("Hard fork in progress. Please retry the transaction later!"); //10800
 
     $acc = new Account;
     $block = new Block;
@@ -131,7 +134,9 @@ elseif($q=="getPublicKey"){
     $val=$data['val']+0;
     $fee=$val*0.0025;
     if($fee<0.00000001) $fee=0.00000001;
+   
 
+    if($fee>10&&$current['height']>10800) $fee=10; //10800
     if($val<0.00000001) api_err("Invalid value");
  
    
diff --git a/include/block.inc.php b/include/block.inc.php
index 526b4ec..b168064 100755
--- a/include/block.inc.php
+++ b/include/block.inc.php
@@ -195,22 +195,26 @@ public function forge($nonce, $argon, $public_key, $private_key){
 }
 
 
-public function mine($public_key, $nonce, $argon, $difficulty=0, $current_id=0){
-	
+public function mine($public_key, $nonce, $argon, $difficulty=0, $current_id=0, $current_height=0){
+	global $_config;
 	if($current_id===0){
 		$current=$this->current();
 		$current_id=$current['id'];
-	}
+		$current_height=$current['height'];
+	} 
 	if($difficulty===0) $difficulty=$this->difficulty();
 	
-
-	$argon='$argon2i$v=19$m=16384,t=4,p=4'.$argon;
+	
+	if($current_height>10800) 	$argon='$argon2i$v=19$m=524288,t=1,p=1'.$argon; //10800
+	else $argon='$argon2i$v=19$m=16384,t=4,p=4'.$argon;
 	$base="$public_key-$nonce-".$current_id."-$difficulty";
 	
 	
 	
 	
-	if(!password_verify($base,$argon)) {  return false; }
+	if(!password_verify($base,$argon)) { return false; }
+
+	if($_config['testnet']==true) return true;
 
 	$hash=$base.$argon;
 
@@ -246,7 +250,7 @@ public function parse_block($block, $height, $data, $test=true){
 	foreach($data as &$x){
 		if(empty($x['src'])) $x['src']=$acc->get_address($x['public_key']);
 		
-		if(!$trx->check($x)) return false;
+		if(!$trx->check($x,$height)) return false;
 		
 		$balance[$x['src']]+=$x['val']+$x['fee'];
 		
diff --git a/include/init.inc.php b/include/init.inc.php
index fb473dc..b5db271 100755
--- a/include/init.inc.php
+++ b/include/init.inc.php
@@ -1,6 +1,6 @@
 <?php
 
-define("VERSION", "0.1a");
+define("VERSION", "0.2b");
 
 date_default_timezone_set("Europe/Amsterdam");
 
diff --git a/include/transaction.inc.php b/include/transaction.inc.php
index ffbcd40..f3f8012 100755
--- a/include/transaction.inc.php
+++ b/include/transaction.inc.php
@@ -50,7 +50,7 @@ class Transaction {
                         _log("$x[id] - Transaction has empty src");
                         continue;
                     } 
-                    if(!$this->check($trans)){
+                    if(!$this->check($trans, $current['height'])){
                         _log("$x[id] - Transaction Check Failed");
                         continue;
                     } 
@@ -114,8 +114,13 @@ class Transaction {
     }
     
 
-    public function check($x){
+    public function check($x, $height=0){
                 
+		if($height===0){
+			$block=new Block;
+			$current=$block->current();
+			$height=$current['height'];
+		}
                 $acc= new Account;
                 $info=$x['val']."-".$x['fee']."-".$x['dst']."-".$x['message']."-".$x['version']."-".$x['public_key']."-".$x['date'];
 
@@ -125,6 +130,7 @@ class Transaction {
                 $fee=$x['val']*0.0025;
 		$fee=number_format($fee,8,".","");
                 if($fee<0.00000001) $fee=0.00000001;
+		if($height>10800&&$fee>10) $fee=10; //10800
                 if($fee!=$x['fee']) { _log("$x[id] - Fee not 0.25%"); return false; }
 
                 if(!$acc->valid($x['dst'])) { _log("$x[id] - Invalid destination address"); return false; }
diff --git a/mine.php b/mine.php
index 7bcd1d8..288368f 100755
--- a/mine.php
+++ b/mine.php
@@ -30,7 +30,7 @@ set_time_limit(360);
 $q=$_GET['q'];
 
 $ip=$_SERVER['REMOTE_ADDR'];
-if(!in_array($ip,$_config['allowed_hosts'])) api_err("unauthorized");
+if($_config['testnet']==false&&!in_array($ip,$_config['allowed_hosts'])) api_err("unauthorized");
 
 if($q=="info"){
 	$diff=$block->difficulty();
diff --git a/peer.php b/peer.php
index dc5b082..ac4b8ee 100755
--- a/peer.php
+++ b/peer.php
@@ -69,6 +69,12 @@ elseif($q=="ping"){
 
 
 elseif($q=="submitTransaction"){
+
+    $current=$block->current();
+
+    if($current['height']>10790&&$current['height']<10810) api_err("Hard fork in progress. Please retry the transaction later!");
+
+
     if($_config['sanity_sync']==1) api_err("sanity-sync");
     
     $data['id']=san($data['id']);
diff --git a/sanity.php b/sanity.php
index e549e60..3771a07 100755
--- a/sanity.php
+++ b/sanity.php
@@ -85,7 +85,7 @@ do {
 	$prev = $block->get($current['height']-1);
 	
 	$public=$acc->public_key($data['generator']);
-	if(!$block->mine($public, $data['nonce'],$data['argon'],$block->difficulty($current['height']-1),$prev['id'])) { echo "Invalid prev-block\n"; break;}
+	if(!$block->mine($public, $data['nonce'],$data['argon'],$block->difficulty($current['height']-1),$prev['id'], $prev['height'])) { echo "Invalid prev-block\n"; break;}
 	$block->pop(1);
 	if(!$block->check($data)) break;
 
@@ -134,7 +134,7 @@ $total_peers=count($r);
 
 $peered=array();
 
-if($total_peers==0){
+if($total_peers==0&&$_config['testnet']==false){
 	$i=0;
 	echo "No peers found. Attempting to get peers from arionum.com\n";
 	$f=file("https://www.arionum.com/peers.txt");
@@ -284,7 +284,7 @@ if($current['height']<$largest_height&&$largest_height>1){
 					}
 				
 					for($i=$last_good+1;$i<=$largest_height;$i++){
-						if(!$block->mine($cblock[$i]['public_key'], $cblock[$i]['nonce'], $cblock[$i]['argon'], $cblock[$i]['difficulty'], $cblock[$i-1]['id'])) {$invalid=true; break; }
+						if(!$block->mine($cblock[$i]['public_key'], $cblock[$i]['nonce'], $cblock[$i]['argon'], $cblock[$i]['difficulty'], $cblock[$i-1]['id'],$cblock[$i-1]['height'])) {$invalid=true; break; }
 					}
 				}
 				if($invalid==false){
@@ -380,7 +380,7 @@ if($_config['sanity_recheck_blocks']>0){
 
 			$key=$db->single("SELECT public_key FROM accounts WHERE id=:id",array(":id"=>$data['generator']));
 
-			if(!$block->mine($key,$data['nonce'], $data['argon'], $data['difficulty'], $blocks[$i-1]['id'])) {
+			if(!$block->mine($key,$data['nonce'], $data['argon'], $data['difficulty'], $blocks[$i-1]['id'], $blocks[$i-1]['height'])) {
 					$db->run("UPDATE config SET val=1 WHERE cfg='sanity_sync'");
 					_log("Invalid block detected. Deleting everything after $data[height] - $data[id]");
 					sleep(10);
diff --git a/util.php b/util.php
index 7bd2d37..12d3081 100755
--- a/util.php
+++ b/util.php
@@ -91,7 +91,7 @@ elseif($cmd=="recheck-blocks"){
 		
 		$key=$db->single("SELECT public_key FROM accounts WHERE id=:id",array(":id"=>$data['generator']));
 
-		if(!$block->mine($key,$data['nonce'], $data['argon'], $data['difficulty'], $blocks[$i-1]['id'])) {
+		if(!$block->mine($key,$data['nonce'], $data['argon'], $data['difficulty'], $blocks[$i-1]['id'],$blocks[$i-1]['height'])) {
 			_log("Invalid block detected. We should delete everything after $data[height] - $data[id]");
 			break;
 		}