What is OKB holding?

Could you please elaborate on the question "What is OKB holding?"? I'm particularly interested in understanding the nature of OKB's holdings. Are they primarily composed of cryptocurrencies, tokens, or other digital assets? Also, could you provide some insights into the rationale behind the choice of these holdings? Furthermore, how does OKB ensure the safety and security of its holdings? Lastly, how do these holdings contribute to the overall value and stability of OKB? Thank you for your assistance in clarifying this matter.