When did spot bitcoin ETFs get the green light?

Ladies and gentlemen, as a keen observer of the cryptocurrency and finance industry, I'm particularly interested in the development of spot bitcoin ETFs. Given their potential significance in broadening investors' access to the bitcoin market, I'm keen to ask - When did spot bitcoin ETFs actually get the green light to be traded publicly? This is a pivotal moment for the industry, and I'm eager to understand the timeline and context surrounding this significant milestone. Your insights would be greatly appreciated.