Abstract
Blockchain has evolved rapidly in the past decade, but it still faces challenges such as scalability, large block size, slow block verification, high communication overhead. Though multiple solutions have been proposed to overcome these challenges, a few solutions perform aggregation of blockchain data. Moreover, blockchain data can be a blockchain state, transaction, or consensus message. Therefore, the solutions involving aggregation have immense potential to solve several existing challenges in the blockchain ecosystem. In this work, we investigate and scrutinize possible aggregations in the blockchain. For that purpose, we first briefly describe cryptographic primitives with aggregation scheme and their applicability in the blockchain. These schemes can empower the blockchain with improved scalability, reduced block size, low communication overhead, and fast block verification. Then, we identify nine research problems related to these cryptographic primitives.
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