[gesman]

Store them in fully reconstructable deterministic wallet (the one that can be rebuilt from scratch using long enough passphrase only). Split passphrase in 3 pieces (A, B, C) and store it in an envelope with instructions in three different, unrelated legal firms to be given to your heirs in case of your death.

Firm 1: A,B

Firm 2: C,B

Firm 3: A,C

This way:

- Your assets are protected from banks getting hold of your assets (including safety deposit boxes) in a future for whatever mayhem reasons.

- You assets are protected in case if any of these firms gets uncooperative, hacked, robbed or blackmailed to disclose password. Single firm cannot reconstruct your wallet - it doesn't have enough information.

- It's enough to have cooperation of 2 out of 3 firms = 2 letters to fully reconstruct the wallet.