Leading cryptocurrencies held on to their gains Tuesday, as investors expected the relief rally to go longer. What Happened: Bitcoin broke $66,000 for the first time in a month and has rallied 22% since its low of $54,000 during the early July bloodbath. The coin faces stiff resistance at the level as of this writing. Ethereum breached $3,500 during overnight hours Tuesday, a level last seen on July 1. About $198.71 million worth of positions were liquidated in the last 24 hours, with short liquidations accounting for $100 million. Bitcoin’s Open Interest spiked 3.28% to $34.36 billion in the …