What does OKB mean in Russian?

I'm quite fascinated by the world of cryptocurrencies, but there's one term that's been bugging me lately. Could you please shed some light on the meaning of OKB in Russian? I've heard it mentioned in a few crypto-related discussions, but the exact translation and context remain elusive to me. Could you enlighten me on this, perhaps with a brief explanation of its significance in the cryptosphere as well? It would be greatly appreciated if you could provide a concise yet informative answer to this inquiry.