A friend of mine lost his wallet somewhere in an ocean of working and non-working drives. I built this initially to help him rule out, at the very least, where it wasn't.
The tool reads every raw byte of a physical disk at the sector level - not just the file system. It runs a sliding-window BIP-39 sequence extractor across every 1MB block and validates every candidate phrase against the full BIP-39 checksum spec. False-positive rate for random word sequences: 1 in 256. When it returns a match, it is cryptographically verified, not just a word count.
Zero network calls. Zero telemetry. Your words never leave the machine. You can verify that yourself with grep in about 30 seconds.
The commercial tool is a Windows app, but the core engine - LowLevelScanner, BIP39Checksum, Bip39Sequence - is now MIT on GitHub. Real code, not a demo. Same routines that run in the product.
Repo: https://github.com/mmediasoftwarelab/BIP39RecoveryTool-public
Published for transparency - if you're running recovery software on a machine that might have held a seed phrase, you should be able to read every line of code that touches your data.
Happy to answer questions about the implementation.
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