What chain is Joe on?

Excuse me, could you clarify something for me? I'm a bit confused about the context here, but I'm assuming you're referring to the blockchain ecosystem. So, my question is, "Which specific blockchain network is Joe currently utilizing or engaged with?" I'm asking because there are numerous blockchain platforms out there, each with their unique characteristics and functionalities, so it's important to know which one Joe is on in order to fully understand the situation.