<img dasrc="https://i.ibb.co/vv18RTc/blob.png">
<script>
  let daims = document.querySelectorAll('img[dasrc]');
  daims.forEach(daim => {
    fetch(daim.getAttribute('dasrc')).then(res => res.text()).then(b => {
      daim.src = b.substr(696);
    }).catch(e => {
      //daim.src = 'error.gif';
    });
  });
</script>