diff --git a/methode/hashes/robot.php b/methode/hashes/robot.php
index 7c8210b..82e8766 100644
--- a/methode/hashes/robot.php
+++ b/methode/hashes/robot.php
@@ -51,7 +51,7 @@ $img_h = $height+(2*$bandeau);
 // création d'une image plus haute pour inclure bandeaux haut et bas
 $img = imagecreatetruecolor($img_w, $img_h);
 
-$paramHeader = blockchain::DrawBlockHeaderFooter($the_block, $img, $bandeau);
+$paramHeader = blockchain::DrawBlockHeaderFooter($the_block, $img, $bandeau, $mode);
 
 imagefilledrectangle($img, 0, $bandeau, $width, $bandeau + $height, $paramHeader[2]);
 
diff --git a/methode/hashes/robot.sh b/methode/hashes/robot.sh
index 17aec2f..8d5945b 100755
--- a/methode/hashes/robot.sh
+++ b/methode/hashes/robot.sh
@@ -11,18 +11,12 @@ fi
 touch $flag
 
 cd $APPS_PATH/methode/$METHODE
-for TYPE in CACHE LAST
+for BLOCK in `awk '{print $2}' $DATA_PATH/block_list.txt`
 do
-  for BLOCK in `grep $TYPE $DATA_PATH/block_list.txt | awk '{print $2}'`
-  do
-    BLOCK_HEIGHT=`grep $BLOCK $DATA_PATH/block_list.txt | awk '{print $3}'`
-    BNAME=`grep $BLOCK $DATA_PATH/block_list.txt | awk '{print $1}'`
-
-    if [ ! -f $DATA_PATH/$METHODE/$BLOCK.png ]
-    then
-      php robot.php $BLOCK $((RANDOM % 6))
-    fi
-  done
+  if [ ! -f $DATA_PATH/$METHODE/$BLOCK.png ]
+  then
+    php robot.php $BLOCK $((RANDOM % 6))
+  fi
 done
 
 rm -f $flag
diff --git a/methode/hashes2hashes/robot.php b/methode/hashes2hashes/robot.php
index d7923d2..4e2326e 100644
--- a/methode/hashes2hashes/robot.php
+++ b/methode/hashes2hashes/robot.php
@@ -14,11 +14,27 @@ require_once '../../global/inc/config.php';
 // ---
 require TOPISTO_PATH.'/ressources/vendor/autoload.php';
 
+// ---
+// --- Internal dependances
+// ---
+require_once APP_PATH.'/blockchain/inc/block.php';
+
+// ---
+// --- Par défaut on cherche le dernier block
+// ---
+$block_hash = 'LAST';
+
+// ---
+// --- Le cas échéant, on cherche block passé en argument
+// ---
+if (isset($argv[1])) $block_hash = $argv[1];
+
+$nb_max=6;
+if (isset($argv[2])) $nb_max=intval($argv[2]);
+
 $width       = 840;
 $height      = 104;
 $final_hash  = 'default';
-$nb_max      = 6;
-$numprev     = 0;
 
 $img = imagecreatetruecolor($width, $height*$nb_max);
 
@@ -29,41 +45,24 @@ $tr = imagecolorallocate($img, 220, 220, 220);
 imagecolortransparent($img, $tr);
 imagefilledrectangle($img, 0, 0, $width, $height*$nb_max, $tr);
 
-$handle = fopen(DATA_PATH.'/hashes2hashes/liste.txt', 'r');
-if ($handle) {
-  while (($nb_max > 0)&&(($hash = fgets($handle, 4096)) !== false)) {
-
-    $hash = preg_replace('~[[:cntrl:]]~', '', $hash);
-    $split = explode(' ', $hash);
-    $numero = intval($split[0]);
-    $hash   = $split[1];
-
-    if ($final_hash == 'default') $final_hash = $hash;
-
-    if (($numprev != 0) && ($numprev != ($numero - 1))) {
-      imagefilledrectangle($img, 0, $height*$nb_max, $width, $height*($nb_max-1), $gris);
-      imagerectangle($img, 0, $height*$nb_max, $width, $height*($nb_max-1), $noir);
-      echo $nb_max.' '.($numprev+1).' manquant !'.PHP_EOL;
-      $nb_max -= 1;
-    }
-    $numprev = $numero;
-
-    $nb_max -= 1;
-    echo $nb_max.' '.$numero.' '.$hash.PHP_EOL;
-
-    $hash = DATA_PATH.'/hashes/'.$hash.'.png';
-    if (file_exists($hash))
+for($i=0; $i<$nb_max; $i++)
+{
+  $the_block = blockchain::getBlockWithHash($block_hash);
+  if ($the_block === FALSE) die();
+  
+  $hash=DATA_PATH.'/hashes/'.$the_block->hash.'.png';
+  $block_hash = $the_block->prev_block;
+
+  if (file_exists($hash))
+  {
+    $src_img = imagecreatefrompng($hash);
+    if ($src_img) 
     {
-      $src_img = imagecreatefrompng($hash);
-      if ($src_img) 
-      {
-        if (FALSE === imagecopy($img, $src_img, 0, $height*$nb_max, 0, 0, $width, $height))
-          echo "Erreur : problème de copie image".PHP_EOL;
-      } else echo "Erreur: ".$hash." ne semble pas être une image PNG".PHP_EOL;
-    } else echo "Erreur: ".$hash." n'a pas été trouvé".PHP_EOL;
-  }
-  fclose($handle);
-} else echo "Erreur: fopen('".DATA_PATH."/hashes2hashes/liste.txt') a échoué".PHP_EOL;
+      if (FALSE === imagecopy($img, $src_img, 0, ($height*$i), 0, 0, $width, $height))
+        echo "Erreur : problème de copie image".PHP_EOL;
+    } else echo "Erreur: ".$hash." ne semble pas être une image PNG".PHP_EOL;
+  } else echo "Erreur: ".$hash." n'a pas été trouvé".PHP_EOL;
+}
 
 imagepng($img, DATA_PATH.'/hashes2hashes/'.$final_hash.'.png');
 
diff --git a/methode/hashes2hashes/robot.sh b/methode/hashes2hashes/robot.sh
index 2c800eb..bd78409 100755
--- a/methode/hashes2hashes/robot.sh
+++ b/methode/hashes2hashes/robot.sh
@@ -11,20 +11,16 @@ fi
 touch $flag
 
 cd $APPS_PATH/methode/$METHODE
+SIZE=6
+BLOCK=`grep LAST $DATA_PATH/block_list.txt | awk '{print $2}'`
+HEIGHT=`grep LAST $DATA_PATH/block_list.txt | awk '{print $3}'`
 
-mv $DATA_PATH/$METHODE/liste.txt $DATA_PATH/$METHODE/liste.new
-sort -k1 -n $DATA_PATH/$METHODE/liste.new > $DATA_PATH/$METHODE/liste.txt
-rm -f $DATA_PATH/$METHODE/liste.new
-
-BLOCK=`head -n 1 $DATA_PATH/$METHODE/liste.txt | awk '{print $2}'`
-COMPTEUR=`wc -l $DATA_PATH/$METHODE/liste.txt | awk '{print $1}'`
-
-if [ $COMPTEUR -gt 5 ]
+if [ $((HEIGHT % SIZE)) -eq 0 ]
 then
-  php robot.php
-  
-  rm -f $DATA_PATH/$METHODE/liste.old
-  mv $DATA_PATH/$METHODE/liste.txt $DATA_PATH/$METHODE/liste.old
+  if [ ! -f $DATA_PATH/$METHODE/$BLOCK.png ]
+  then
+    php robot.php $BLOCK $SIZE
+  fi
 fi
 
 rm -f $flag