Can you buy Sentinel over the counter?

Excuse me, could you please clarify something for me? I've been hearing a lot about Sentinel lately, and I'm interested in potentially investing in it. However, I'm not entirely sure about the purchasing process. So, my question is, is it possible to buy Sentinel over the counter, or do I need to go through a specific exchange or platform to acquire it? I'm looking for the most direct and convenient way to purchase Sentinel, and I'd appreciate any guidance you can provide. Thank you in advance for your assistance.