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November 11, 2013, 04:18:12 PM |
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Fragmented "privkeys" (or, m of n). These can be created using the casascius address utility and probably some others.
You basically create a kind of fragmented privkey*, where there are (usually, but not necessarily) three different privkey fragments. You require at least two to discover the privkey. There are some different ways of doing this from here. You could keep one, give one to the beneficiary now, and have the lawyer/whatever hold on to the other. This doesn't cover you and the beneficiary dying at the same time, but since "m" and "n" are variables, you could have a 9 of 10 kind of key and probably figure something out with the tradeoffs you're most comfortable with.
*it's not actually a privkey - Idunno if there's an actual name for it... archive? I guess it is technically a private key, but not the privkey to a pubkey in Bitcoin. It's just a secret to get the privkey. (I think)
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