How does bitrot protection actually work?

Just got a RN316 and found this great thread. Thanks everyone for your helpful discussion of technical details. I plan on running a memtest any time before scrubbing.

Was also wondering about what scenarios bit rot protection would work, especially the scenarios snakyjake propsed in message 6.

Has anyone managed to find out any info about this from Netgear? It would be nice to know specifically if it will ever verify against checksums of data in snapshots, and not just RAID parity.

Is there a notification any time there's a checksum mismatch and not just when an error couldn't be corrected, or just a log entry generated in that scenario?

I did find a document at an EU Netgear site where it explains that BTRFS corrupt checksum events are sent to the md layer to find the correct data as mdgm said (thanks also for that information about use cases): ReadyNAS_Bit_Rot_Protection_Overview.pdf

This sheds a little more light on the mechanism, but not necessarily the technicals. Hope it gives slightly more clarity to the OP's question.