Pragmatic definition of consensus for light clients

The exploration of Zero-Knowledge Proofs (ZKPs) in blockchain technology highlights significant bottlenecks, particularly when applying fullchain ZKPs due to the need for proving the entire rule set within each block. An innovative approach suggested involves the utilization of Proof of Work (PoW) concepts but limited only to a few blocks behind the current blockchain tip. This method could potentially streamline the verification process.

By adopting a light client-based ZKP mechanism, it is proposed that the initiation and propagation of new light clients could be executed much faster—within seconds. These light clients would distribute ZKPs that confirm the validity of the blockchain, verify its size, and establish links to specific chain characteristics such as the tip header and relevant utreexo commits. This approach not only enhances the efficiency of blockchain operations but also leverages the strengths of ZKPs to ensure security and integrity without the heavyweight requirements of traditional fullchain proof methods.