Swiss banking group Vontobel is increasing what it called the investment volume in an offering of tracker certificates on bitcoin to CHF18 million from the original CHF1.7 million after strong demand.

The bank last year became the first provider to offer Swiss and German investors the listed certificates, which it said made the electronic exchange currency a “bankable asset”.

This instrument performance stood at plus 75 percent on 3 April, it said.  

In light of the strong demand, the number of certificates was increased as of 15 March to 15,000 in Switzerland, and in Germany from 55,000 originally ...