Cats are famously bad at contingency planning. Tuga sleeps in the middle of the garden path with her belly exposed, having made no arrangements whatsoever for the possibility of rain, dogs, or the postman. She gets away with it because the myth grants her nine lives.

Your seed phrase gets one.

This is the least glamorous article I will ever write, and it is probably the most important. Everybody who takes self-custody seriously eventually arrives at an uncomfortable question, and most people arrive at it and then quietly walk away: what happens to your bitcoin if something happens to you?

1. The Failure Mode Is Not What You Think

Ask someone what they are protecting their coins from and they will say hackers. Fair. But look at how self-custodied bitcoin has actually been lost, and hacking is not top of the list:

• A hard drive in a landfill.
• A seed phrase written on paper in a house that later had a fire, a flood, or a very enthusiastic house move.
• A person who died with everything in their head and nothing in anyone else's.
• A "clever" hiding place that outlived the memory of where it was.

None of those involve an attacker. They involve entropy, and entropy is undefeated. Self-custody transfers the risk from someone stealing it to you losing it, and the second risk is the one people leave unmanaged.

2. Paper Burns. Metal Doesn't.

Your recovery phrase is the whole thing. Not the device — the phrase. Lose the hardware wallet and you buy another one and restore. Lose the phrase and there is no support line, no reset link, no appeal.

The rules that actually matter:

• Never digital. No photos, no notes app, no cloud drive, no password manager, no email to yourself, no "encrypted" text file. The moment it touches an internet-connected device it is a different threat model entirely.
• Metal, not paper. Steel backup plates cost about the same as a mediocre dinner and survive fire and water. Paper is a plan that works right up until the day it needs to.
• Two locations, minimum. One copy at home and one somewhere geographically separate. A single hiding place is a single point of failure, however clever it feels.
• Never split a phrase into halves. People love this idea. It reduces your security (twelve known words makes brute-forcing dramatically easier) and increases your loss risk (now two things must survive instead of one). If you want splitting done properly, that is what multisig is for.

3. The Passphrase Trap

The optional extra word — the "25th word", the passphrase — is a real security upgrade. It also silently destroys more inheritances than any other feature in bitcoin.

Here is how it goes. You add a passphrase. You back up the twelve words in steel, carefully, in two locations. The passphrase lives only in your head, because that was the point. You die. Your family finds the steel plates, follows the instructions, restores the wallet — and finds an empty account, because without the passphrase the correct seed opens the wrong wallet.

They will not know why. It will look exactly like the money was never there.

If you use a passphrase, it must be backed up too, separately from the seed, with instructions that say it exists. A secret nobody knows exists is not a secret. It is a deletion with extra steps.

4. Write the Letter, Not the Seed

The document your family needs is not your seed phrase. It is the map. Written for someone who has never heard the word "blockchain" and is reading it on the worst week of their life.

It should say, in plain language:

• That it exists at all. How much, roughly, and that it is real money. People have thrown away hardware wallets because they looked like a USB stick.
• Where the backups are. Both of them. Physically. "Safe deposit box at X, key held by Y."
• What the device is and what app opens it. Brand and model. "This is a Ledger. You need Ledger Live, from ledger.com — and only from ledger.com."
• Who to trust for help. Name a specific person you trust technically, and warn explicitly that anyone who contacts them offering to help recover it is a thief. Grieving families are targeted.
• The one rule. Nobody, ever, types those words into a website or sends them to a person. Not to "verify", not to "unlock", not to anyone claiming to be support.

Keep the letter with your will, not with the seed. And update it when things change, because a map to a house you moved out of is worse than no map at all.

5. Do the Fire Drill

This is the step everyone skips, and it is the only one that proves any of the rest works.

Buy a second hardware wallet, or factory-reset the one you have — after confirming your backup, obviously. Restore from your steel plates alone. No memory, no phone, no photo. Just the metal.

If your coins appear, your plan is real. If they don't, you have just discovered that at a moment of your choosing, with your money still safe, instead of your widow discovering it in three years.

Do it once a year. It takes twenty minutes and it converts a hope into a fact.

The Point

Tuga will sleep through every scenario in this article. She has the luxury of that because someone else in this household does the contingency planning, and I have made my peace with the arrangement.

Nobody is doing it for your bitcoin. Not a bank, not an exchange, not a lawyer who doesn't know what a passphrase is. Self-custody means you took the keys and the responsibility in the same motion, and the responsibility half is the boring paperwork nobody posts about.

A cat gets nine lives. Your seed phrase gets one. Back it up like you believe that. 🐾⚡

Not financial or legal advice — I write about cats and hold my own keys, which qualifies me for neither profession. Estate rules differ by country; talk to someone qualified where you actually live.