One of the world's biggest currency trading banks, Citigroup (C), is weighing a move into cryptocurrency markets as its clients are showing increased interest in the sector, the Financial Times reports, citing the bank's global head of foreign exchange.Trading, financing, and custody are being considered, though a decision hasn't yet been made, Citi's Itay Tuchman told the FT.The news comes after some of Citi's competitors move into the crypto space. Goldman Sachs, like Citi, is looking into crypto, focusing on the institutional side, and Morgan Stanley is giving its wealth management clients access to bitcoin funds, according to CNBC.Earlier this year, BNY Mellon said it will offer to custody bitcoin for clients.Turning to the markets, bitcoin edges down (-0.1%) to ~$57.3K in recent trading.