What features should I look for in order to find the most secure bike lock on the market?

When looking for the most secure bike lock, consider features such as a strong material like hardened steel, a reliable locking mechanism like a disc detainer or a double-bolt design, and a high security rating from independent testing organizations like Sold Secure or ART. Additionally, look for features like a thick and durable chain or shackle, a pick-resistant keyway, and resistance to cutting tools like bolt cutters or angle grinders.