Multishares backup (Shamir Secret Sharing) is a great way to encode your seed with the specified redundancy to distribute your secret.

This was in the Wasabi ToDo list since 2021. The crypto was implemented nine months ago and it seems we are going to finally have it in our next release!

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How does it work?

In this first version you can select "Create new wallet" > "Multishares backup", then you have to select your backup schema n-of-m, and then instead of showing you 12/24 worlds it displays `m` sets of 33 words to backup. Then you will need `n` of those sets of 33 words to recover your wallet.

Technically, this is an implementation of the Satoshi Labs SLIP39: https://github.com/satoshilabs/slips/blob/master/slip-0039.md

Matechamically, I know you know but it is based on Lagrange polynomial interpolation.

Cool!

Is there a tool to do this with an existing 12/24 seed? Or does it support that even?

Currently there are tools, yes. I should google to find them but yes, you decode your bip39 seed and encode it back with slip39.

Very cool!