I am trying into establishing a multisig setup utilizing Sparrow, and wished to see if anybody can discover any flaws in my arrange, and doubtlessly accessing my funds if I lose a key.
arrange = 2 of three
Key retailer 1 = Passport HWW
Key retailer 2 = Chilly Card HWW
Key retailer 3 = Gordian Seed Device (cellular scorching pockets)
I’ll arrange the Chilly Card and Passport as per the directions within the beneath video
https://www.youtube.com/watch?v=Gx0mke_4BJU
Seeds for these shall be written onto a seed plate (one seed phrase per plate).
After establishing the Gordian Seed Device and importing to Sparrow/exporting again to the seed instrument, I’ll deposit (the smallest quantity attainable) into the multisig pockets.
I’ll then restore the pockets utilizing all 3 seeds to a special chilly card and passport machine, and import the pockets as a brand new pockets in Sparrow.
If the funds can be found within the pockets, I’ve the seed phrases all saved appropriately. I wipe the unique chilly card and passport HWWs.
The seed plates for the two HWWs shall be saved robustly at completely different bodily areas.
I’ll destroy the copy of the seed phrase for the gordian seed instrument.
I’ll then check spending the BTC on the pockets in 3 separate transactions (signing with all 3 of the attainable combos of the two of three key shops.) If I can full these 3 transactions I’m glad I’ve the power to entry my BTC ought to any 1 of the three keystores turn out to be compromised.
My questions are
- is there any apparent flaw on this form of storage setup?
and extra importantly
- the one different info I’ll want within the occasion that one in all my keys turns into bodily compromised is the xpub/zpub of every of the three keys?
Moreover storing these xpub/zpubs collectively (while it might create a privateness danger) does not create a safety danger? e.g with every of the two seed plates I might retailer the xpub/zpub for ALL 3 KEYS on an encrypted SD card. If somebody in some way managed to achieve entry to a seed plate (extremely unlikely given the strong bodily arrange, however worst case), they’d have entry to 1 of the three seed phrases, AND entry to all 3 xpub/zpubs? This could not give them entry to my BTC, and I might nonetheless have entry to it and will spend it (switch it to a different pockets) when it grew to become obvious one of many seed phrases may very well be compromised?
I simply need to be certain that I am not capturing myself within the foot through the use of a extra subtle setup than a regular chilly storage. In actuality I take into account the prospect of creating a mistake establishing a multisig answer and exponentially extra likley menace than normal chilly storage turning into compromised.
