'Stipulated' means that both parties have already agreed about this (in a matter which is before a court), which I doubt to be the case. Here, that claim is argued, not stipulated.

Bear in mind that the Bitcoin Foundation already organized a conference in San Jose, CA, and solicits donations from a website accessible in CA. As I understand it, that is quite sufficient for the state of CA to assert some jurisdiction over its activities: http://en.wikipedia.org/wiki/Minimum_contacts#Activities_as_...