Who should be on your incident response team?

As a cryptocurrency and finance professional, I'm curious to know, who exactly should be on an incident response team? Is it simply a group of IT specialists, or should it also include individuals from legal, finance, and perhaps even customer service departments? Understanding the composition of such a team can help prevent or mitigate the impact of a potential incident, so it's important to get it right. Can you elaborate on the key roles and responsibilities that should be represented on an incident response team?