We cannot completely say Bulgaria owns the largest BTC. However Bulgaria is one of the countries along India, China, USA, Nigeria etc. who has a good number of its citizens owns BTC.
mate. citizens of a country owning bitcoin is different than the country owning Bitcoin. by meaning of Bulgaria owns the largest amount of Bitcoin OP probably meant owning Bitcoin on Govt level.. that could only be a way Bulgaria can own largest amount of bitcoin compared to other.
Otherwise if we compare people of each country owns bitcoin then Bulgaria wouldn't be in top 10 oe ven top 50.
there are so many people own bitcoin in countries larger in popoulation then bulgaria.