URL::to($param)
directs to your root folder (/public) and adds the string folders. URL::to('js/bootstrap.js')
directs to /public/js/bootstrap.js
. this looks correct to me.
although you used a css linking tag for javascript. try using:
<script src="{{ URL::to('js/jquery.min.js') }}"></script>
<script src="{{ URL::to('js/bootstrap.js') }}"></script>