Implement storing BTC transactions data - Closes #1945 #1955
What issue have I solved?
How have I implemented/fixed it?
Analogically, I changed
Note that currently it is based on branch
How has this been tested?
Note that there will be another ticket to make the page show everything properly.
There is a number of TODO comments referring to things that need to be done in the future when enabling the BTC feature to the end user.