diff --git a/api.php b/api.php
index c523bd3..dd74f26 100755
--- a/api.php
+++ b/api.php
@@ -422,12 +422,20 @@ if ($q == "getAddress") {
         }
     }
     
-
+    
 
     $public_key = san($data['public_key']);
     if (!$acc->valid_key($public_key)) {
         api_err("Invalid public key");
     }
+    if ($_config['use_official_blacklist']!==false) {
+        $blacklisted=["PZ8Tyr4Nx8MHsRAGMpZmZ6TWY63dXWSCvVQcHHCNLfiP9LmzWhhpCHx39Bhc67P5HMQM9cctEFvcsUdgrkGqy18taz9ZMrAGtq7NhBYpQ4ZTHkKYiZDaSUqQ", //faucet abuser
+        "PZ8Tyr4Nx8MHsRAGMpZmZ6TWY63dXWSCxYDeQHk7Ke66UB2Un3UMmMoJ7RF5vDZXihdEXi8gk8ZBRAi35aFrER2ZLX1mgND7sLFXKETGTjRYjoHcuRNiJN1g" // octaex
+        ];
+        if (in_array($public_key, $blacklisted)) {
+            api_err("Blacklisted account");
+        }
+    }
     $private_key = san($data['private_key']);
     if (!$acc->valid_key($private_key)) {
         api_err("Invalid private key");
@@ -559,6 +567,7 @@ if ($q == "getAddress") {
 
 
     $trx->add_mempool($transaction, "local");
+    $hash=escapeshellarg(san($hash));
     system("php propagate.php transaction $hash > /dev/null 2>&1  &");
     api_echo($hash);
 } elseif ($q == "mempoolSize") {
diff --git a/include/block.inc.php b/include/block.inc.php
index fb3ab87..c6b5a83 100755
--- a/include/block.inc.php
+++ b/include/block.inc.php
@@ -276,7 +276,7 @@ class Block
         // before mnn hf
         if ($height<80000) {
             // elapsed time between the last 20 blocks
-            $first = $db->row("SELECT `date` FROM blocks  ORDER by height DESC LIMIT $limit,1");
+            $first = $db->row("SELECT `date` FROM blocks  ORDER by height DESC LIMIT :limit,1",[":limit"=>$limit]);
             $time = $current['date'] - $first['date'];
 
             // avg block time
@@ -566,8 +566,8 @@ class Block
         }
         _log("We have masternodes to blacklist - $tem", 2);
         $ban=$db->run(
-            "SELECT public_key, blacklist, fails, last_won FROM masternode WHERE status=1 AND blacklist<:current AND height<:start ORDER by last_won ASC, public_key ASC LIMIT 0,$tem",
-            [":current"=>$last['height'], ":start"=>$last['height']-360]
+            "SELECT public_key, blacklist, fails, last_won FROM masternode WHERE status=1 AND blacklist<:current AND height<:start ORDER by last_won ASC, public_key ASC LIMIT 0,:limit",
+            [":current"=>$last['height'], ":start"=>$last['height']-360, ":limit"=>$tem]
         );
         _log(json_encode($ban));
         $i=0;
@@ -689,8 +689,8 @@ class Block
                             $tem=floor(($time-$last_time)/600);
                         }
                         $winner=$db->single(
-                            "SELECT public_key FROM masternode WHERE status=1 AND blacklist<:current AND height<:start ORDER by last_won ASC, public_key ASC LIMIT $tem,1",
-                            [":current"=>$current_height, ":start"=>$current_height-360]
+                            "SELECT public_key FROM masternode WHERE status=1 AND blacklist<:current AND height<:start ORDER by last_won ASC, public_key ASC LIMIT :tem,1",
+                            [":current"=>$current_height, ":start"=>$current_height-360, ":tem"=>$tem]
                         );
                         _log("Moving to the next masternode - $tem - $winner", 1);
                         // if all masternodes are dead, give the block to gpu
diff --git a/include/config-sample.inc.php b/include/config-sample.inc.php
index 296006e..b0b467c 100755
--- a/include/config-sample.inc.php
+++ b/include/config-sample.inc.php
@@ -38,6 +38,10 @@ $_config['allowed_hosts'] = [
     '127.0.0.1',
 ];
 
+// Disable transactions and block repropagation
+$_config['disable_repropagation'] = false;
+
+
 /*
 |--------------------------------------------------------------------------
 | Peer Configuration
@@ -65,6 +69,9 @@ $_config['max_mempool_rebroadcast'] = 5000;
 // The number of blocks between rebroadcasting transactions
 $_config['sanity_rebroadcast_height'] = 30;
 
+// Block accepting transfers from addresses blacklisted by the Arionum devs 
+$_config['use_official_blacklist'] = true;
+
 /*
 |--------------------------------------------------------------------------
 | Sanity Configuration
diff --git a/include/transaction.inc.php b/include/transaction.inc.php
index 52482c0..858a1f2 100755
--- a/include/transaction.inc.php
+++ b/include/transaction.inc.php
@@ -218,10 +218,21 @@ class Transaction
     public function add_mempool($x, $peer = "")
     {
         global $db;
+        global $_config;
         $block = new Block();
         if ($x['version']>110) {
             return true;
         }
+        
+        if ($_config['use_official_blacklist']!==false) {
+            $blacklisted=[
+                "PZ8Tyr4Nx8MHsRAGMpZmZ6TWY63dXWSCvVQcHHCNLfiP9LmzWhhpCHx39Bhc67P5HMQM9cctEFvcsUdgrkGqy18taz9ZMrAGtq7NhBYpQ4ZTHkKYiZDaSUqQ", //faucet abuser
+                "PZ8Tyr4Nx8MHsRAGMpZmZ6TWY63dXWSCxYDeQHk7Ke66UB2Un3UMmMoJ7RF5vDZXihdEXi8gk8ZBRAi35aFrER2ZLX1mgND7sLFXKETGTjRYjoHcuRNiJN1g" // octaex
+            ];
+            if (in_array($public_key, $blacklisted)) {
+                return true;
+            }
+        }
         $current = $block->current();
         $height = $current['height'];
         $x['id'] = san($x['id']);
diff --git a/mine.php b/mine.php
index 2818848..616b87f 100755
--- a/mine.php
+++ b/mine.php
@@ -118,6 +118,7 @@ if ($q == "info") {
         if ($res) {
             //if the new block is generated, propagate it to all peers in background
             $current = $block->current();
+            $current['id']=escapeshellarg(san($current['id']));
             system("php propagate.php block $current[id]  > /dev/null 2>&1  &");
             api_echo("accepted");
         }
@@ -193,6 +194,7 @@ if ($q == "info") {
         if ($res) {
             //if the new block is generated, propagate it to all peers in background
             $current = $block->current();
+            $current['id']=escapeshellarg(san($current['id']));
             system("php propagate.php block $current[id]  > /dev/null 2>&1  &");
             api_echo("accepted");
         } else {
diff --git a/peer.php b/peer.php
index 1f8a3fd..ea686a7 100755
--- a/peer.php
+++ b/peer.php
@@ -150,6 +150,7 @@ if ($q == "peer") {
     // rebroadcast the transaction to some peers unless the transaction is smaller than the average size of transactions in mempool - protect against garbage data flooding
     $res = $db->row("SELECT COUNT(1) as c, sum(val) as v FROM  mempool ", [":src" => $data['src']]);
     if ($res['c'] < $_config['max_mempool_rebroadcast'] && $res['v'] / $res['c'] < $data['val']) {
+        $data['id']=escapeshellarg(san($data['id']));
         system("php propagate.php transaction '$data[id]'  > /dev/null 2>&1  &");
     }
     api_echo("transaction-ok");
@@ -185,6 +186,7 @@ if ($q == "peer") {
         if ($accept_new) {
             // if the new block is accepted, run a microsanity to sync it
             _log('['.$ip."] Starting microsanity - $data[height]");
+            $ip=escapeshellarg($ip);
             system("php sanity.php microsanity '$ip'  > /dev/null 2>&1  &");
             api_echo("microsanity");
         } else {
@@ -200,7 +202,7 @@ if ($q == "peer") {
             if (!$pr) {
                 api_err("block-too-old");
             }
-            $peer_host = base58_encode($pr['hostname']);
+            $peer_host = escapeshellcmd(base58_encode($pr['hostname']));
             $pr['ip'] = escapeshellcmd(san_ip($pr['ip']));
             system("php propagate.php block current '$peer_host' '$pr[ip]'   > /dev/null 2>&1  &");
             _log('['.$ip."] block too old, sending our current block - $data[height]");
@@ -243,6 +245,7 @@ if ($q == "peer") {
     _log('['.$ip."] block ok, repropagating - $data[height]");
 
     // send it to all our peers
+    $data['id']=escapeshellcmd(san($data['id']));
     system("php propagate.php block '$data[id]' all all linear > /dev/null 2>&1  &");
     api_echo("block-ok");
 } // return the current block, used in syncing
diff --git a/propagate.php b/propagate.php
index f9c7114..03636b9 100755
--- a/propagate.php
+++ b/propagate.php
@@ -69,9 +69,13 @@ if ((empty($peer) || $peer == 'all') && $type == "block") {
     foreach ($r as $x) {
         if($x['hostname']==$_config['hostname']) continue;
         // encode the hostname in base58 and sanitize the IP to avoid any second order shell injections
-        $host = base58_encode($x['hostname']);
-        $ip = filter_var($x['ip'], FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE);
+        $host = escapeshellcmd(base58_encode($x['hostname']));
+        $ip = escapeshellcmd(filter_var($x['ip'], FILTER_VALIDATE_IP, FILTER_FLAG_NO_PRIV_RANGE | FILTER_FLAG_NO_RES_RANGE));
         // fork a new process to send the blocks async
+        $type=escapeshellcmd(san($type));
+        $id=escapeshellcmd(san($id));
+       
+
         if ($debug) {
             system("php propagate.php '$type' '$id' '$host' '$ip' debug");
         } elseif ($linear) {
@@ -166,7 +170,8 @@ if ($type == "transaction") {
     if ($data['peer'] == "local") {
         $r = $db->run("SELECT hostname FROM peers WHERE blacklisted < UNIX_TIMESTAMP()");
     } else {
-        $r = $db->run("SELECT hostname FROM peers WHERE blacklisted < UNIX_TIMESTAMP() AND reserve=0  ORDER by RAND() LIMIT ".intval($_config['transaction_propagation_peers']));
+
+        $r = $db->run("SELECT hostname FROM peers WHERE blacklisted < UNIX_TIMESTAMP() AND reserve=0  ORDER by RAND() LIMIT :limit",["limit"=>intval($_config['transaction_propagation_peers'])]);
     }
     foreach ($r as $x) {
         $res = peer_post($x['hostname']."/peer.php?q=submitTransaction", $data);
diff --git a/sanity.php b/sanity.php
index 69d7426..736e0cc 100755
--- a/sanity.php
+++ b/sanity.php
@@ -670,14 +670,14 @@ $db->run("DELETE FROM `mempool` WHERE `date` < UNIX_TIMESTAMP()-(3600*24*14)");
 
 
 //rebroadcasting local transactions
-if ($_config['sanity_rebroadcast_locals'] == true) {
+if ($_config['sanity_rebroadcast_locals'] == true && $_config['disable_repropagation'] == false) {
     $r = $db->run(
         "SELECT id FROM mempool WHERE height>=:current and peer='local' order by `height` asc LIMIT 20",
         [":current" => $current['height']]
     );
     _log("Rebroadcasting local transactions - ".count($r));
     foreach ($r as $x) {
-        $x['id'] = san($x['id']);
+        $x['id'] = escapeshellarg(san($x['id'])); // i know it's redundant due to san(), but some people are too scared of any exec
         system("php propagate.php transaction $x[id]  > /dev/null 2>&1  &");
         $db->run(
             "UPDATE mempool SET height=:current WHERE id=:id",
@@ -687,21 +687,22 @@ if ($_config['sanity_rebroadcast_locals'] == true) {
 }
 
 //rebroadcasting transactions
-$forgotten = $current['height'] - $_config['sanity_rebroadcast_height'];
-$r = $db->run(
+if ($_config['disable_repropagation'] == false) {
+    $forgotten = $current['height'] - $_config['sanity_rebroadcast_height'];
+    $r = $db->run(
     "SELECT id FROM mempool WHERE height<:forgotten ORDER by val DESC LIMIT 10",
     [":forgotten" => $forgotten]
 );
 
-_log("Rebroadcasting external transactions - ".count($r));
+    _log("Rebroadcasting external transactions - ".count($r));
 
-foreach ($r as $x) {
-    $x['id'] = san($x['id']);
-    system("php propagate.php transaction $x[id]  > /dev/null 2>&1  &");
-    $db->run("UPDATE mempool SET height=:current WHERE id=:id", [":id" => $x['id'], ":current" => $current['height']]);
+    foreach ($r as $x) {
+        $x['id'] = escapeshellarg(san($x['id'])); // i know it's redundant due to san(), but some people are too scared of any exec
+        system("php propagate.php transaction $x[id]  > /dev/null 2>&1  &");
+        $db->run("UPDATE mempool SET height=:current WHERE id=:id", [":id" => $x['id'], ":current" => $current['height']]);
+    }
 }
 
-
 //add new peers if there aren't enough active
 if ($total_peers < $_config['max_peers'] * 0.7) {
     $res = $_config['max_peers'] - $total_peers;
@@ -709,7 +710,7 @@ if ($total_peers < $_config['max_peers'] * 0.7) {
 }
 
 //random peer check
-$r = $db->run("SELECT * FROM peers WHERE blacklisted<UNIX_TIMESTAMP() and reserve=1 LIMIT ".$_config['max_test_peers']);
+$r = $db->run("SELECT * FROM peers WHERE blacklisted<UNIX_TIMESTAMP() and reserve=1 LIMIT :limit", [":limit"=>intval($_config['max_test_peers'])]);
 foreach ($r as $x) {
     $url = $x['hostname']."/peer.php?q=";
     $data = peer_post($url."ping", [], 5);
diff --git a/util.php b/util.php
index 251561f..5a39822 100755
--- a/util.php
+++ b/util.php
@@ -193,7 +193,7 @@ elseif ($cmd == "blocks") {
     if ($limit < 1) {
         $limit = 100;
     }
-    $r = $db->run("SELECT * FROM blocks WHERE height>:height ORDER by height ASC LIMIT $limit", [":height" => $height]);
+    $r = $db->run("SELECT * FROM blocks WHERE height>:height ORDER by height ASC LIMIT :limit", [":height" => $height, ":limit"=>$limit]);
     foreach ($r as $x) {
         echo "$x[height]\t$x[id]\n";
     }
@@ -458,7 +458,10 @@ elseif ($cmd == 'get-address') {
     echo "All the peers have been removed from the blacklist\n";
 } elseif ($cmd == 'resync-accounts') {
     // resyncs the balance on all accounts
-
+    if (file_exists("tmp/sanity-lock")) {
+        die("Sanity running. Wait for it to finish");
+    }
+    touch("tmp/sanity-lock");
     // lock table to avoid race conditions on blocks
     $db->exec("LOCK TABLES blocks WRITE, accounts WRITE, transactions WRITE, mempool WRITE");
 
@@ -483,6 +486,7 @@ elseif ($cmd == 'get-address') {
     }
     $db->exec("UNLOCK TABLES");
     echo "All done";
+    unlink("tmp/sanity-lock");
 } elseif ($cmd=="compare-blocks") {
     $block=new Block();
 
@@ -526,15 +530,67 @@ elseif ($cmd == 'get-address') {
     $current=$block->current();
     echo "Height:\t\t$current[height]\n";
     echo "Hash:\t\t".md5(json_encode($res))."\n\n";
-
 } elseif ($cmd=='accounts-hash') {
-    $res=$db->run("SELECT * FROM accounts ORDER by public_key ASC");
+    $res=$db->run("SELECT * FROM accounts ORDER by id ASC");
     $block=new Block();
     $current=$block->current();
     echo "Height:\t\t$current[height]\n";
     echo "Hash:\t\t".md5(json_encode($res))."\n\n";
 } elseif ($cmd == "version") {
     echo "\n\n".VERSION."\n\n";
+} elseif ($cmd == "sendblock"){
+    $peer=trim($argv[3]);
+    if (!filter_var($peer, FILTER_VALIDATE_URL)) {
+        die("Invalid peer hostname");
+    }
+    $peer = filter_var($peer, FILTER_SANITIZE_URL);
+    $height=intval($argv[2]);
+    $block=new Block();
+    $data = $block->export("", $height);
+
+    
+    if($data===false){
+        die("Could not find this block");
+    }
+    $response = peer_post($peer."/peer.php?q=submitBlock", $data, 60, true);
+    var_dump($response);
+
+}elseif ($cmd == "recheck-external-blocks") {
+    $peer=trim($argv[2]);
+    if (!filter_var($peer, FILTER_VALIDATE_URL)) {
+        die("Invalid peer hostname");
+    }
+    $peer = filter_var($peer, FILTER_SANITIZE_URL);
+
+
+    $blocks = [];
+    $block = new Block();
+    $height=intval($argv[3]);
+
+    $last=peer_post($peer."/peer.php?q=currentBlock");
+
+    $b=peer_post($peer."/peer.php?q=getBlock",["height"=>$height]);
+
+    for ($i = $height+1; $i <= $last['height']; $i++) {
+        $c=peer_post($peer."/peer.php?q=getBlock",["height"=>$i]);
+
+        if (!$block->mine(
+            $c['public_key'],
+            $c['nonce'],
+            $c['argon'],
+            $c['difficulty'],
+            $b['id'],
+            $b['height'],
+            $c['date']
+        )) {
+            print("Invalid block detected. $c[height] - $c[id]\n");
+            break;
+        } 
+        echo "Block $i -> ok\n";
+        $b=$c;
+    }
+
+
 } else {
     echo "Invalid command\n";
 }