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We propose LazyLedger, a design for distributed ledgers where the blockchainis optimised for solely ordering and guaranteeing the availability oftransaction data. Responsibility for executing and validating transactions isshifted to only the clients that have an interest in specific transactionsrelating to blockchain applications that they use. As the core function of theconsensus system of a distributed ledger is to order transactions and ensuretheir availability, consensus participants do not necessarily need to beconcerned with the contents of those transactions. This reduces the problem ofblock verification to data availability verification, which can be achievedprobabilistically with sub-linear complexity, without downloading the wholeblock. The amount of resources required to reach consensus can thus beminimised, as transaction validity rules can be decoupled from consensus rules.We also implement and evaluate several example LazyLedger applications, andvalidate that the workload of clients of specific applications does notsignificantly increase when the workload of other applications that use thesame chain increase.

LazyLedger: A Distributed Data Availability Ledger With Client-Side Smart Contracts