There are whispers of a shadow Strategic Bitcoin reserve in Venezuela of >600,000 BTC

The Bitcoin would have been aquired through gold swaps, oil settlements, and domestic Bitcoin mining seizures. 

If true, it would shake up the sovereign Bitcoin reserve standings

https://beincrypto.com/venezuela-bitcoin-reserve-global-impact/
https://whalehunting.projectbrazen.com/the-60-billion-question-is-venezuela-secretly-a-bitcoin-superpower/