Neat idea but quite high maintenance in some scenarios.
Guess that would cover the majority of the stash, but if you're consistently adding to the vault, making new transactions all the time would be a PITA.
Moving UTXOs to invalidate each DMTX is also detrimental to privacy if your vault gets automatically and regularly populated with mixed outputs from coinjoin rounds.
The UX could be improved, no doubt. But the alternative is inventing a secure, bespoke, posthumous seed-transfer scheme.
At least with DMTX, a standardized procedure could be developed and published in advance. This has privacy implications. Everything has tradeoffs.
The point is that Bitcoin is peer-to-peer, programmable money. It is superior to all other forms in this regard. Your heirs will need to be competent in order to inherit. They should have their own key setup for their level of expertise to receive coin directly.
> Moving UTXOs to invalidate each DMTX is also detrimental to privacy if your vault gets automatically and regularly populated with mixed outputs from coinjoin rounds.
Send one vaulted UTXO back into a mixer and it invalidates the whole DMTX. An outside observer just sees a single post-mix UTXO going back for more mixing.
Fair comment. Not nit picking or poo pooing your suggestions BTW.
Just thinking out loud 👍
