Japanese investment firm Metaplanet Inc. has boosted its Bitcoin (CRYPTO: BTC) portfolio, purchasing an additional 107.91 BTCs valued at around $6.92 million. What happened: The Tokyo Stock Exchange-listed firm disclosed its latest grab Tuesday, reaffirming its conviction in the world’s largest cryptocurrency’s potential. The stash was purchased at an average price of $64,189.55 per BTC. With the latest buy, Metaplanet raised its total Bitcoin holdings to 506.745, worth roughly $32.92 million. Shares of the company were up over 2% at last check. See Also: Pay Taxes With Bitcoin? Ohio Senator P…