There’s one simple signal for whether the BTC price has bottomed. Right now, it hasn’t.

Crypto traders, having seen bitcoin BTC$62,895.02, the largest cryptocurrency, bounce overnight to $64,000 from recent lows under $60,000, may be wondering whether the bottom has been hit and a fresh bull run has started.

There is a simple signal to get that confirmation. Right now, it is saying the rebound has not started.

That signal comes from the widely followed momentum gauge called the relative strength index, or RSI. The measure can range from 0 to 100. Readings above 70 indicate that an asset is running hot and potentially overbought, while readings below 30 suggest the opposite. Between those extremes, specific levels often emerge as dividing lines between bullish and bearish environments.

For the bitcoin price, the line is at 41.5, according to crypto data analytics platform Material Indicators. Above that level, BTC has historically had a stronger argument for being in a bullish macro trend. Below it, bearish pressure tends to dominate.

“Right now, Bitcoin is below it, and still trending down,” Keith Alan, an analyst at Material Indicators, said in an email. “That does not mean price has to collapse, but it does mean the burden of proof is still on the bulls.”