PSA: My phone just guessed my private key. If you use mobile (phone) wallets, clear your text prediction cache.

So, you know how when creating a new seed phrase in a wallet some apps make you reenter the entire seed?

Yeah, predictive typing remembers your used words and will suggest the second word as soon as you type the first one, especially if it’s a word you not commonly use.

In my case my phone is in a different language than english as well, so it automatically adds typed words to the dictionary, which means my custom dictionary contains words in my language, and 24 english words…

This makes it easy to attack, get your hands on a phone, start any chat app, and start typing any words off the BIP39 list, and see what the phone suggests.

Do yourself a solid and prevent that from happening by clearing your predictive type cache.

Here’s how to do it on Android:

https://intoput.com/clear-samsung-keyboard-history/

Here’s how to do it on iPhone:

https://www.macworld.co.uk/how-to/how-remove-words-from-iphone-predictive-text-3642859/#:~:text=To%20reset%20your%20keyboard%20dictionary,%20head%20into%20your%20iPhone’s%20settings,predictive%20words%20from%20showing%20up.