Bitcoin is legal in most countries all around the world.
* Here Bolivia banning bitcoin in 2014.
* Ecuador went one step further and banned the bitcoin and all other digital crypto currencies which are decentralized by the National Assembly of Ecuador
* National Bank of the Kyrgyz Republic specifically mentioned the bitcoin while imposing ban on the virtual currency in its law.
* The law in the Bangladesh are very strict than above all combined as Bangladesh Bank said that "anybody caught using the virtual currency could be jailed under the country's strict anti-money laundering laws" .
From above we could see that out 195 countries in the world only four have banned the bitcoin. In countries where bitcoins is not declared illegal is deemed as legal. Understanding of law is such that if something is not illegal it is considered as legal. Because we can not mention or list everything under the Sun that is legal, but we could mention what is illegal.