Bitcoin's recent rebound could prove limited and temporary, ING technical analyst Roelof-Jan van den Akker says in a note. The cryptocurrency rose to a two-week high of $64,539 overnight, rebounding from the 21-month month low of $57,775 reached July 1, according to LSEG. It last trades down 0.8% at $63,329. Bitcoin's appreciation potential looks capped around the important resistance zone between the horizontal barrier at $65,670 and the flat exponential moving average-200 line, currently at $68,603, he says. ING expects a resumption of bitcoin's previous downtrend with a break below the July 1 low in the near-term and towards $47,705. "Investors should also be mindful of the implications of a weekly close below the crucial horizontal support level at $54,450," he says. (renae.dyer@wsj.com)