zhoutong, what happened to the third guy on the team? I remember there was an engineer (Jerrold Poh?) and now it's just you and Asher. See here:
http://coinjar.io/aboutJerrold decided to go back to his previous job because he wasn't really comfortable with startup life (12+ hours a day with no salary). But now Asher and I are very proactively bringing new guys on board, and we are planning to raise another seed round in the US.