Thanks for the suggestion.
This type of brainstorming is exactly what I was hoping to encourage.
Whereas it takes 17 out of the top 20, a coordinated governmental attack would be so improbable and, whereas government actions are very slow as @apshamilton mentioned, I think some prudent but simple countermeasures would suffice.
Also, limiting jurisdictions would require witnesses to declare their jurisdictions, which would actually aid a malicious government in identifying and targeting witnesses to attack.