Ethereum research report: If the execution layer only retains its active state for 1 year, the state size will decrease by about 78% Foresight News reports that Ethereum execution layer researcher Weiihann has released a performance experiment report on State Expiry. This experiment compared the performance difference between "full state nodes" and "only retaining active state nodes for 1 year" by running Ethereum mainnet block load on the Geth client for about 1 year. The study found that reducing the state size not only lowers the hardware threshold, but also provides space for increasing the gas cap and throughput. The experimental results show that if only the active state reached within one year is retained, the database size will decrease from 359 GB to 81 GB, a decrease of about 77.5%, with the reduction of Trie nodes being the most significant. In terms of performance, the block re execution time has been reduced by about 15%, and the read performance has been significantly improved, especially with a 46% reduction in P50 latency for storage reads and a 36% reduction in P99 latency. In addition, tail latency has also been improved, with a 21% reduction in P99 block insertion time, which helps nodes maintain synchronization under load. Future research will cover comparisons with other clients, exploration of different expiration periods (such as 6 months), and cleaning solutions specifically for contract storage.