Sub-layer blockchain sharding is a method used to improve the scalability and efficiency of blockchain networks. It involves dividing the blockchain into smaller, manageable pieces called shards. Each shard operates independently and processes its own transactions and smart contracts.This approach allows multiple transactions to be executed simultaneously across different shards. As a result, the network can handle a larger number of transactions per second, reducing congestion and improving overall performance.In addition to increasing speed and efficiency, sub-layer sharding can also enhance security. Since shards can be designed to contain specific applications or user groups, malicious actors would need to compromise multiple shards to affect the entire network.Overall, sub-layer blockchain sharding represents a way to enhance the capabilities of blockchain technologies, making them more suitable for widespread use and adoption. By allowing for better resource management and faster transaction times, it addresses some of the key challenges facing blockchain systems today.