I would do that in the simplest way possible
1. create a new wallet 12/24 with a passphrase +1
2. write down on metal
3. give her only the seed on metal plus the passphrase. She will know what to do in 18 years
A friend asked me today for some advice on how to secure 5 million sats in a single UTXO for 18 years. A gift to their niece to spend in the future.
Assumptions:
- No one will be around to guide them through the process of spending / using the BTC
- Durability and ease of use will be weighted most heavily
- The securing method has to last 18 years
- Ideally self custodial but all answers will be looked at!
Best answer will be zapped a 5,000 sat bounty! #sats
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Discussion
If you do that with no instructions and education at all, there is a high chance to lost it or someone around her steal it or throw it away without knowing what it is.
I had similar concerns around this as well. But for me to educate my friend on how to use a hardware signing device airgapped with a software solution whilst also backing up the seed phase and then trusting him to uncle Jim it for 18 years for someone else when he is still at the custodial hodling (I’m getting him off the exchanges asap!) level it was getting a bit too much. Maybe in a few years when he is ready we can revisit a stronger strategy! Your concerns are super valid and thanks for contributing :) !
Include a copy of Mastering Bitcoin
The point is that you should not be concerned with education at all. 18 years from now bitcoin is the standard and it will be very easy for her to know what to do. The only instruction is - keep it extremely safe.
Not all countries will adopt a bitcoin standard at the same time and if they do, will they educate their people about bitcoin in the right way with self custody... or will they teach them to buy only regulated ETFs with banks and make bitcoin in self custody illegal for individuals.
Of course, anything can happen. She will have to figure it out 18 years from now, there's nothing we can do.
One potential issue is quantum computers. If that happens, meanwhile, she needs to call for help from someone (I'm assuming we are talking about a child, or she won't study bitcoin in the meantime).