BTCDOM has risen again, which means that many altcoins have officially entered a downtrend period. The altcoins in this downtrend will drop at least 40% to 60%! If you seize the opportunity, you can double your investment; I have already quadrupled mine in the last three days. Remember to set stop-losses for rebounds, and once there's a significant increase that breaks the daily line, it's time to exit. Wait for signs of a downturn before shorting; do not hold onto losing positions.