Abstract: An instrument dematerialized by nature, independent of any state sovereignty, available exclusively via Internet, bitcoin is a creation of the private environment, its use being an indisputable reality, with numerous legal implications. Starting from the definition of bitcoin and its main characteristics, this study intends to address whether bitcoin use is legal or not and if it is recognized by the law of different states, whether bitcoin transactions mean concluding a contract and if such a contract meets the conditions of validity, whether the income from bitcoin transactions is licit or illicit and if it can be subjected to taxation, as well as the existence of jurisprudence in this matter and the courts’ view of the problem.

Key-words: bitcoin, regulating bitcoin, bitcoin transactions, taxation of bitcoin