Does QRL currently use stateful or stateless signatures?

Excuse me, could you clarify for me if QRL, the blockchain platform known for its focus on quantum-resistant technology, employs stateful or stateless signatures in its current operations? Understanding this distinction is crucial for assessing its security posture and compatibility with future advancements in cryptography. I'm particularly interested in how this aspect of QRL's design aligns with the evolving needs of the blockchain ecosystem.