Commerzbank is expanding its booming cryptocurrency business via a partnership with German stock exchange operator Deutsche Börse to offer corporate clients a way to participate in the cryptocurrency market with Bitcoin and Ether. The bank has entered into a partnership with Deutsche Börse subsidiary Crypto Finance, both companies announced on Thursday. The new offering is initially aimed at select existing clients. While Commerzbank will take care of the custody of the crypto assets, Crypto Finance will deal with the trading side, the companies said. This will give customers secure access to …