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Even if no change is made to code....another attack potential: central banks can sponsor (lend to "startups"/"entrepreneurs") organizations that'll cause a huge bouts of volatile events to keep away broad-mass-user-base: they would bid up prices like crazy to hold a signification portion of coins, and then unload the coins on the market either all at one time (huge drop in 1 week) or slowly to control volume over-time (ie 3 years of lower prices).
In light of recent cyber-attacks enabled by official government-entity backdoors, does anyone question the attempts to attach these evil acts to cryptocurrency since these 'hackers' then ask for payments in such? Wouldn't it be convenient for government-backed entities to set a plan to make things like Bitcoin look bad by using their contractors (hackers for hire) to use these exploits so that subsequently bad publicity would be spread on Bitcoin to general public around the world?
Isn't this made easy by all these global companies using USA-developed (China-made) computing infrastructure which has the backdoors the NSA/CIA requires for having such control?