That is not something new, I use a transformer to charge my car battery and plugin it to the AC current in my house...
So what you can do by transforming the energy from AC to DC? i think the only application is to charge batteries but maybe I'm missing some important applications for it.
And one last question, can you use this technology for mining, or what's the relation between your project and cryptos?
No idea about mining, may be a setup of electric generators. But check this link:
https://highvoltageforum.net/index.php?topic=2286.msg16731#msg16731
You will get the idea. Not sure where to use those. Need to build a few more like that. I would like to try building electric motor this way to see the results.