formysister/ethereum-transaction-interrupter

This front-run application interrupt and prevent/drop the pending transaction using private key.

Monitoring, interrupting, and replacement transaction

Medium Blog

https://medium.com/@cyberstorm2007/how-to-protect-ethereum-assets-in-account-that-private-key-was-leaked-1-620e42c6b64
https://medium.com/@cyberstorm2007/how-to-protect-ethereum-assets-in-account-that-private-key-was-leaked-2-8db9f338d0a8