Which govt. has control over bitcoins?

The answer is, No Govt.

We people are ultimate regulators of Bitcoin prices!

The cryptocurrency Bitcoin is entirely decentralised, which means no central authority is involved and unregulated, which means no one in particular controls it. There is neither any national or international bank or government mint nor any insurance coverage for the depositor. The cryptocurrency Bitcoin is self-contained with no scene or consideration of any sort of collateral, which means there is neither any precious metal nor a gem behind bitcoins. The value or worth of the currency lives inside the currency itself.

Bitcoins minting is taken care of by “MINERS” ( read my blog post about Bitcoin mining to understand what it is: https://steemit.com/bitcoin/@omkaarbhalerao/what-is-bitcoin-mining-if-you-can-do-it-today-no-one-can-stop-you-from-becoming-a-millionaire)

Image courtesy: http://fortune.com/2017/12/15/bitcoin-police-regulation/

Once you become owner of certain bitcoins, the behavior of currency resembles that of physical gold
i.e. the bitcoins trade and have value similar to that of nuggets of gold you are holding in your pocket. Bitcoins can be put to use by doing purchase of goods, services and even Pizza (don't forget to read about the story of a guy who gave 10,000 bitcoins just to buy two pizzas which costs more than about $91m now: https://steemit.com/news/@omkaarbhalerao/story-of-buying-two-pizzas-with-10000-bitcoins-in-2010-or-now-worth-91-millions-dollars) over the internet, or simply keep them stored in a online or offline wallet in a hope that their value will increase over time and reach $1m for 1 Bitcoin. Well, to be honest with you guys, even I hope that one day it reaches $1m for one bitcoin!

Source: http://www.techcryptoguru.com/?p=519