Meanings of remain untraceable in English

They are believed to account for less than 1 percent of stones traded today, although many diamonds remain untraceable.

Though they are believed to account for less than 1 percent of stones bought and sold today, millions of carats produced annually remain untraceable.

Many bitcoin promoters have backed efforts at regulating the digital currency to broaden its appeal, but other factions prefer that it remain untraceable and unregulatable.