Good day, esteemed expert in the realm of cryptocurrency and finance. I am quite fascinated by the enigmatic world of cryptocurrencies, especially the granddaddy of them all, Bitcoin. Given China's profound influence in global finance and technology, I am curious to inquire about the extent of China's ownership of Bitcoin. Could you enlighten me on this matter? Is there any reliable data or estimation on the amount of Bitcoin that China possesses? And what are the potential implications of this significant holding on the global cryptocurrency market and the economy at large? Thank you for your time and expertise.