Improving the state of Cosmos fuzzing

By Gustavo Grieco

Cosmos is a platform enabling the creation of blockchains in Go (or other languages). Its reference implementation, Cosmos SDK, leverages strong fuzz testing extensively, following two approaches: smart fuzzing for low-level code, and dumb fuzzing for high-level simulation.

In this blog post, we explain the differences between these approaches and show how we added smart fuzzing on top of the high-level simulation framework. As a bonus, our smart fuzzer integration led us to identify and fix three …

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