I know that the Paracord will creep (stretch) over time. The typical solution for when a knot in this kind of use creeps is to coat it with something to fix it in place. I have seen paint, varnish and other coatings used to stiffen up the knot. Mostly I have seen this used on natural fiber knots, I am hoping that the low creep inherent in Paracord will keep the knot in place. The knot was tied very tight, and I am hoping that it won't loosen enough to require a coating. The real solution for when a knot like this gets loose is to tighten it up and take the slack out, but if someone isn't available to do this, the easy solution is to coat it. Like the old saying, 'If it moves salute it, if it doesn't move, pick it up, if you can't pick it up, paint it'.