With the increasing interest in utilizing public blockchains for various purposes, developers have started developing application-specific chains that are tailor-made and tailored to meet the specific requirements of their apps. These specialized chains are commonly referred to as appchains. An appchain is typically not a complete blockchain, but rather provides an optimal execution environment for an application, while depending on a foundational "Layer 1" blockchain for consensus. Occasionally known as "Layer 3" or "L3". Additionally, please refer to the concepts of "blockchain trilemma", "modular blockchain", and "Layer 2".