Paper outlasts every device you own PAPERKEY
Lays a secret out on a printable sheet with a check on every line, and reads it back telling you exactly which line is wrong.
A passphrase, a wallet recovery phrase or a small key file is safest written down where no hacker can reach it, and hardest to type back correctly years later. PAPERKEY holds anything up to a few kilobytes. The sheet is only as safe as the place you keep it, and nothing is sent anywhere while you make it.
What to write down
The sheet
Putting it somewhere
Type it back
One line per line on the sheet. Row numbers, spaces and case do not matter.
What came back
Doing this often? The OBSCURA Sovereign Suite splits a secret onto cards you can print, so no single card gives it away, and keeps a recovery kit. On its own, US$4 a month; with everything else, US$9 a month or US$79 a year. 7 days free.