How to preform the finger coin roll / Cascade.

When preforming the coin roll, start with the coin in the hand, laying just above the palm and below the tips of the fingers.
Grab a coin & try it.
Place the thumb on the coin gripping the coin applying a small amount of pressure, slide the coin up toward the pointer finger until the coin is held in an up-right position between the thumb and side of pointer finger. (the start position)
Then push the coin up and allow the coin to lean & fall over onto the top of the pointer finger, but not the middle finger, instead rise the middle finger and allow the edge of the coin to rest.

With the coin laying on the pointer finger grip the edge of the coin with the edge of the middle finger in one movement lower the middle finger and rise the pointer causing the coin to stand up on edge and flip over on to the middle finger, When done correctly the coin will now be laying on top of the middle finger resting the edge on the slightly raised ring finger.

With the coin laying on the middle finger the process is repeated, gripping the coin's edge with the ring finger lower the ring finger causing the coin to stand up on edge and roll onto the ring finger.