Gold and foreign currency reserves are held as the Federal Reserve of most of the country in the world to reduce inflation and maintain the balance of wealth. While most countries show gold and foreign currency holding as reserves the United States is taking its large economy to a stronger position by considering fuel oil and crude oil as reserves. Some of the new states that will be joined the plan consider Bitcoin as a strategic reserve along with gold and other valuable assets.
The US President signed a bill for the establishment of a Bitcoin reserve but I doubt if the country has bought a single Bitcoin. Only seized Bitcoin is in US custody. I am also aware that states like Texas, Arizona, and New Hampshire have signed the same bill but it has not been implemented.
What I have noticed is that, the top countries with the highest bitcoin holdings didn't buy these bitcoin but seized them people involved in illicit activities.