The claimed embodiments provide methods, apparatuses and systems directed to storing write records in a hierarchical index which includes a root node with one or more stem nodes, each corresponding to respective data ranges of a data file. A secured microcontroller of the computing device is used to identify a secured, persistent seed corresponding to the particular domain and stored in secured memory of the computing device. The error bit indicates only that a mismatch occurred between an input signal input into the device and an output signal output from the device.