Here is another way I hide the cord ends.
Start with a crown knot
Tie a wall knot beneath it. Take one strand brimg it underneath its neighbor and back out of the way
Repeat with the other strands
Snug the result
Bring one strand over the top of the knot and uner one strand as shown, tighten. Repeat with other strands
With hemostat go through the center of the knot into any of the four openings, grab the appropriate cord and pull it through
Repeat with the remaining strands