Stop right there and re-read the previous paragraph: Our first stop was three times that volatility reading...
I'm sorry but that is NOT (NOT!!) A random-entry stage, since you are investing in sync with the market. You see the market and you fix your stop/trailing stop so again this isn't a trade that is random anymore, far from it. It is similar to counting the cards in a Blackjack table (such as from the Tom Cruise film Rain Man) and gambling accordingly, your bets aren't random anymore.
A strictly arbitrary entry/exit system will go into a trade randomly and exit the trade following a PRE-determined stop or limit goal has been reached. Your stop/trailing stop can not be modified by you as you trade and call a random entry system.
In fact this so-called arbitrary system you are describing is merely a trend following system in disguise, despite the fact that you are using a coin to enter the transactions because, once again, your exit point isn't arbitrary. Remember that both exit points AND your entry must be arbitrary.
Please tell that to Tom Basso and Van K. Tharp