The video from here: https://www.youtube.com/watch?v=4F89zKhUu1s&t=77s
Honestly, It doesn't look like this (Nikolai Starikov who is a famous writer, politician etc.) knows what he is talking about so I thought I share it with the community to see their opinions on this.
Nikolai Starikov is right when he said that it is uninstitutional to create a currency outside from that is allowed by the law. But he is wrong in one point, even though bitcoin is called a currency but the different states, including those who adopted and those who did not, have not considered bitcoin to be a currency but rather as a form or mode of payment and nothing more. Cryptocurrency such as bitcoin is just like a paypal fund but is not a currency since before a material to be called a currency there must be a declaration of the state. Since bitcoin is not considered by the states as a currency then it is not unconstitutional rather is just a tool or new type of form for payment.