「Def DJ is a music NFT collection by Def Crew.Art designed by uchida_monkey and music by Osteoleuco<Osteoleuco Profile＞Osteoleuco is a hip-hop-based alternative unit consisting of Keisuke Saito and Shimon Hoshino.They are active not only in music, but also in art, writing, and other genre-less activities.The unit's name comes from the osteosarcoma and leukemia that Keisuke Saito suffered from.