While walking the dog I thought of this scenario: You hide your two keys in a separate geographic location. You lose one to a wrench attack. You won't lose your bitcoin, which is good, but now you are trusting Unchained and that crucial second key. In this scenario you're still better off than a single sig, but it's not trustless.
Ah a walk, proof of work for your health. You can actually replace and get a new key then. Again they can coach you through that process to replace it.
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