According to sources, cryptocurrency custodian company Copper is in preliminary talks about a potential listing, with investment banks such as Goldman Sachs, Citigroup and Deutsche Bank likely involved. The final decision depends on the company's recent revenue performance. A Copper spokesperson said the company "has no IPO plans" but declined to comment on whether preliminary negotiations are underway. Previously, its competitor BitGo recently went public, with an initial valuation of about $2 billion.