Launched in 2001, New York-based Signature Bank - the latest US bank to fail in recent days - is one of the more interesting financial firms to have emerged over the past 25 years, and not just because of its involvement in the cryptocurrency sector.

In addition to growing rapidly throughout its 22-year history, thanks in part to an aggressive hiring and remuneration policy, its client list included Donald Trump along with other members of his family.

Indeed, Ivanka Trump, ...