A growing industry of aggregator technologies seeks to address Ethereum’s key scalability issues of slow throughput and high transaction or gas fees. Digests aggregate a large number of transactions outside the main block and then return the packet to Ethereum for recording. There are two types of aggregators: Zero-Knowledge, which uses computer algorithms to verify transactions, and Optimistic, which optimistically believe that transactions are valid. People watching an optimistic network have one week to challenge a potentially fraudulent transaction, and the crowd then runs a fraud test to verify that transaction.
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