Key takeaways: The US and Iran ceasefire boosted stock markets and Bitcoin, but BTC derivatives suggest limited bullish momentum. Legislative setbacks and a “fragile truce” between the US and Iran keep bears active with a potential $68,000 correction on the cards. Bitcoin (BTC) rallied 6% in less than four hours on Tuesday, following gains in global stock markets after the US and Iran reached a two-week ceasefire deal. The rally caught traders off guard, triggering a $280 million liquidation event in Bitcoin futures markets. Bitcoin bears could be in trouble…