The idea
Explain the object, not the secret.
The most common way a careful arrangement fails is not an attack. It is a relative holding a black card, with no idea that it matters or what to do with it.
So write one page. It says what the card is, what it needs, and who to ask, and it contains no part of your password.
Keep it with your will, your documents or the person who will need it. Not in the same envelope as the card.
Contents
What the page should say.
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I
What it is
“This black card holds encrypted information. It needs a phone with the MI8OS app and one password.”
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II
Where the others are
Say that other copies exist and roughly where, so a single lost card does not end the story.
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III
Who holds the password
Name the person or the arrangement. Never the password itself.
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IV
What it is for
One line: accounts, documents, where things are. Enough motivation to take it seriously.
Keep off the page
Never write these.
- The password
- Not a hint, not half of it, not a clue only family would get
- Balances or values
- Turns a note into a reason to look for the card
- Account numbers
- Those belong inside the vault, not beside it
- The card's location
- If they have the note, they do not need a map
Explain the door.
Not the key.