The RIAA certifies Gold to digital singles that have 500,000 Units. Each permanent digital download counts as 1 Unit, while 150 on-demand audio and video streams count as 1 Unit. 

Recently, it was announced that BTS' "MIC Drop" has become the first K-Pop song by a group to be certified by gold by the RIAA. Several days later, "DNA" was also added on to the group's gold-certified tracks. BTS remains to be the only K-Pop group to have made such an achievement. 

Congratulations!