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This paper describes GnatDb, which is an embedded database system that provides protection against both accidental and malicious corruption of data. GnatDb is designed to run on a wide range of appliances, some of which have very limited resources. Therefore, its design is heavily driven by the need to reduce resource consumption. GnatDb employs atomic and durable updates to protect the data against accidental corruption. It prevents malicious corruption of the data using standard cryptographic techniques that leverage the underlying log-structured storage model. We show that the total memory consumption of GnatDb, which includes the code footprint, the stack and the heap, does not exceed 11 KB, while its performance on a typical appliance platform remains at an acceptable level.