Phishing was the most widely used hacking technique for ICOs, with hackers stealing up to $1.5 million in ICO proceeds per month, according to the report.

The research also noted that the volume of ICOs has been slowing since late 2017. Less than 25 percent of ICOs reached their target in November, compared with 90 percent in June.

The study comes amid a cryptocurrency investing craze, with young companies raising hundreds of millions of dollars online to fund their projects, with often little more than a handful of employees and a business plan outlined in a so-called “white paper”.

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