Having defended the key support of $7,455, the bitcoin bulls now need a quick move higher in order to neutralize the threat of a short-term bearish reversal.
As of writing, the cryptocurrency is trading at $7,560 on Bitfinex – down 11 percent from the recent high of $8,507. However, that still marks a gain of more than 30 percent from the June 24 low of $5,755.
So, it is safe to say the bullish trend is still intact. Further, BTC's solid defense of $7,455 (38.2 percent Fibonacci retracement of the rally from the June low) seen in the last 28 hours has raised the prospect of a minor corrective rally.
However, the bulls have little margin for error and the upside needs to gather traction soon as the short-duration technical studies have already adopted a bearish bias, as seen in the chart below.
Daily chart
The bearish crossover between the 5-day and 10-day moving averages (MAs) indicates a short-term bearish setup. Further, the relative strength index (RSI) has breached the key ascending trendline in favor of the bears. Hourly chart 
The 50-hour, 100-hour, and 200-hour MAs are trending south and are located one below the other, indicating the path of least resistance is to the downside. Meanwhile, the RSI has dropped below 50.00 (in bearish territory).
Clearly, the short-term charts are aligned in favor of the bears. So, there is a real risk of BTC falling below the crucial support of $7,455 in the next 24 hours.
Moreover, acceptance below that level would only bolster the already bearish setup discussed above and would confirm a short-term bullish-to-bearish trend change.