diff --git a/exhumate.sh b/exhumate.sh
index 0499dfe..681659b 100755
--- a/exhumate.sh
+++ b/exhumate.sh
@@ -3,50 +3,61 @@
 set -e
 set -o pipefail
 
+[ -n "$1" ] || { echo "error: Provide a beacon address" >&2; exit 1; } 
+BEACON="$1"
+
+[ -n "$FSOCIETY_TELEGRAM_BACKUP_N" ] || { echo "error: N env var not set." >&2; exit 1; }
+[ -n "$FSOCIETY_TELEGRAM_BACKUP_LOCATION" ] || { echo "error: N env var not set." >&2; exit 1; }
+
+ALPHABET="0 1 2"
+BEACONPORT="60666"
+WORKDIR="/run/user/$UID/ftb"
+ZIPPED_KEYS="$FSOCIETY_TELEGRAM_BACKUP_LOCATION/fsociety-archive-secret-slot$FSOCIETY_TELEGRAM_BACKUP_N.zip.gpg"
+TOMB="$FSOCIETY_TELEGRAM_BACKUP_LOCATION/fsociety-archive-2024-01-05.img"
+
+
+cleanup() {
+    sudo umount ./backup
+    sudo cryptsetup close /dev/mapper/fsociety_backup
+
+    sudo sudo chattr +i "$TOMB" "$ZIPPED_KEYS"
+    rm -rfd "$WORKDIR"
+}
+trap cleanup EXIT
+
 check_dependency() {
     command -v $1 > /dev/null || { echo "error: $1 not found" >&2; exit 1; }
 }
-
 check_dependencies() {
     for dep in "$@"; do
         check_dependency "$dep"
     done
 }
-
 check_dependencies "firefox" "ncat" "gpg" "cryptsetup" "unzip" "shred" 
 
-[ -n "$FSOCIETY_TELEGRAM_BACKUP_N" ] || { echo "error: N env var not set." >&2; exit 1; }
 
-[ -n "$FSOCIETY_TELEGRAM_BACKUP_LOCATION" ] || { echo "error: N env var not set." >&2; exit 1; } 
-
-ALPHABET="0 1 2"
-BEACON="quien manda la key"
-BEACONPORT="60666"
-WORKDIR="/run/user/$UID/ftb"
-
-[ ! -e "$WORKDIR" ] || {mkdir -p "$WORKDIR"}
+[ ! -e "$WORKDIR" ] || { echo "error: Delete $WORKDIR." >&2; exit 1; }
+mkdir -p "$WORKDIR"
 cd "$WORKDIR"
 
-gpg -d "$FSOCIETY_TELEGRAM_BACKUP_LOCATION/fsociety-archive-secret-slot$FSOCIETY_TELEGRAM_BACKUP_N.zip.gpg" > keys.zip
+sudo sudo chattr -i "$TOMB" "$ZIPPED_KEYS"
+
+gpg -d "$ZIPPED_KEYS" > keys.zip
 unzip keys.zip
 HEADER="$WORKDIR/fsociety-archive-secret-slot$FSOCIETY_TELEGRAM_BACKUP_N/header$(echo $ALPHABET | tr " " $'\n' | grep -v "^$FSOCIETY_TELEGRAM_BACKUP_N$" | sed 's/^/-slot/' | tr -d $'\n').luks-header"
-TOMB="$FSOCIETY_TELEGRAM_BACKUP_LOCATION/fsociety-archive-2024-01-05.img"
 
-sudo echo "jajaja"
 ncat -v --ssl "$BEACON" "$BEACONPORT" </dev/null | gpg -d | sudo cryptsetup open --header "$HEADER" --key-file - "$TOMB" fsociety_backup
 
 rm -rfd *
 
 mkdir backup
-sudo mount -o ro,uid="$UID",gid="$GID" /dev/mapper/fsociety_backup ./backup
+sudo mount -o ro /dev/mapper/fsociety_backup backup
 
 FFPROFILE="$WORKDIR/ff-$$.$RANDOM.d"
 mkdir -p "$FFPROFILE"
 firefox -profile "$FFPROFILE" --no-remote ./backup/messages.html
 find "$FFPROFILE" -type f -exec shred {} \;
 
-sudo umount ./backup
-sudo cryptsetup close /dev/mapper/fsociety_backup
-rm -rfd "$WORKDIR"
+cleanup()
 
 echo "I go to my fathers... in whose mighty company... I shall not now feel ashamed."