Coinbase’s former chief architect returned to the crypto exchange as its head of platform. 

Rob Witoff led the company’s security and infrastructure from 2014 to 2017 before creating cold storage company Unit 410, Coinbase Chief Operating Officer Emilie Choi wrote in a Dec. 2 blog post. He became the company’s newest executive team member this week. 

“Rob embodies what it is to be a builder,” Choi wrote. “He cares deeply about crypto, developer productivity and empowerment, and creating a seamless user experience.”

21.co also made an executive appointment — multiple in fact.  

The crypto-focused firm revealed it would have two distinct business units:…

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