2 ms·

tldr: master passphrase

• gwillen 15y ago
  It's more than that, though -- the bitcoin private key isn't _encrypted with_ the passphrase, it's _generated directly_ from the passphrase. So there's no data on disk; only data in your mind.
• kiba 15y ago
  It's a passphrase to autogenerate keys deterministically accordingly to an algorithm. Once you finish using the computer, you can just destroy the keys or even destroy your computer.