Crypto Finance, the operator subsidiary of Deutsche Boerse, Germany's largest stock exchange, has signed an agreement with Commerzbank to provide trading services to the bank's corporate clients, just two weeks after it reached a similar agreement with Zürcher Kantonalbank (ZKB) in Switzerland. Commerzbank, Germany's second-largest bank by number of branches, will provide custodial services, the companies said in a press release on Thursday. Deutsche Boerse's trading services will be available to German customers, initially focusing on bitcoin and ethereum transactions.