diff --git a/src/Script/Interpreter/StackInterface.php b/src/Script/Interpreter/StackInterface.php
deleted file mode 100644
index 647ef95f5..000000000
--- a/src/Script/Interpreter/StackInterface.php
+++ /dev/null
@@ -1,138 +0,0 @@
-<?php
-
-declare(strict_types=1);
-
-namespace BitWasp\Bitcoin\Script\Interpreter;
-
-use BitWasp\Buffertools\BufferInterface;
-
-interface StackInterface extends \ArrayAccess, \Iterator
-{
-    /**
-     * @see \SplDoublyLinkedList::pop()
-     * @return BufferInterface
-     */
-    public function pop();
-
-    /**
-     * @see \SplDoublyLinkedList::push()
-     * @param BufferInterface $value
-     * @return void
-     */
-    public function push($value);
-
-    /**
-     * @see \SplDoublyLinkedList::add()
-     * @param int $offset
-     * @param BufferInterface $value
-     * @return void
-     */
-    public function add($offset, $value);
-
-    /**
-     * @see \SplDoublyLinkedList::bottom()
-     * @return BufferInterface
-     */
-    public function bottom();
-
-    /**
-     * @see \SplDoublyLinkedList::top()
-     * @return BufferInterface
-     */
-    public function top();
-
-    /**
-     * @see \SplDoublyLinkedList::isEmpty()
-     * @return bool
-     */
-    public function isEmpty();
-
-    /**
-     * @see \SplDoublyLinkedList::prev()
-     * @return void
-     */
-    public function prev();
-
-    /**
-     * @see \SplDoublyLinkedList::shift()
-     * @return BufferInterface
-     */
-    public function shift();
-
-    /**
-     * @see \SplDoublyLinkedList::unshift()
-     * @param BufferInterface $value
-     * @return void
-     */
-    public function unshift($value);
-
-    /**
-     * @see \ArrayAccess::offsetGet()
-     * @param int $offset
-     * @return BufferInterface
-     */
-    public function offsetGet($offset);
-
-    /**
-     * @see \ArrayAccess::offsetExists()
-     * @param int $offset
-     * @return bool
-     */
-    public function offsetExists($offset);
-
-    /**
-     * @see \ArrayAccess::offsetUnset()
-     * @param int $offset
-     * @return void
-     */
-    public function offsetUnset($offset);
-
-    /**
-     * @see \ArrayAccess::offsetSet()
-     * @param int $offset
-     * @param BufferInterface $value
-     * @return void
-     */
-    public function offsetSet($offset, $value);
-
-    /**
-     * Return the current element
-     * @see \Iterator::current()
-     * @return BufferInterface
-     */
-    public function current();
-
-    /**
-     * Move forward to next element
-     * @see \Iterator::next()
-     * @return void Any returned value is ignored.
-     */
-    public function next();
-
-    /**
-     * Return the key of the current element
-     * @see \Iterator::key()
-     * @return mixed scalar on success, or null on failure.
-     */
-    public function key();
-
-    /**
-     * Checks if current position is valid
-     * @see \Iterator::valid()
-     * @return boolean The return value will be casted to boolean and then evaluated.
-     */
-    public function valid();
-
-    /**
-     * Rewind to the first element
-     * @see \Iterator::rewind()
-     * @return void
-     */
-    public function rewind();
-
-    /**
-     * @see \Countable::count()
-     * @return int
-     */
-    public function count();
-}