As a replacement for paper, something like this makes sense v.s. what you do with a ledger presently. However, shamir's shares notoriously have the issue that the key does exist plaintext on a device at some point. Non-interactive multisig has the benefit of being able to sign transactions without having keys in the same room/place/device ever. -- @JeremyRubin On Wed, Feb 26, 2020 at 9:14 AM Contact Team via bitcoin-dev < bitcoin-dev@lists.linuxfoundation.org> wrote: > Hi Everyone, > Seed phrase security has been a subject of discussion for a long time now. > Though there are varying opinions on the subject but the conflict usually > arises due to different security models used by different individuals. The > general practice in the space has been to use paper or metal engraving > options to secure seed phrase but those too act as a single point of > failure when secure storage is concerned. The hardware wallets, no matter > whether use a secure element or not can be hacked either through basic > glitching or through bigger schemes state enforced backdoors in the closed > soured SE used. > > The option that Cypherock (Cypherock X1 Wallet) is working on removes a > single point of failure when it comes to storage of seed phrases. It uses 2 > of 4 (with the option of setting up custom threshold limit) Shamir Secret > Sharing to split the seed phrase into 4 different shares. Each share gets > stored in a PIN ( hardware enforced ) Card with an EAL 6+ secure element. > The user would need any 2 of these 4 cyCards to recover the seed or make a > transaction. Ideally they should all be stored at different locations and > this added security through distribution makes losing seed phrase highly > improbable. We have decoupled storage and computation aspect of a hardware > wallet. More information can be obtained from cypherock.com. The purpose > of this mail is to get feedback from the community. Let us know if there is > any feedback, we would love it. > > Thanks > _______________________________________________ > bitcoin-dev mailing list > bitcoin-dev@lists.linuxfoundation.org > https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev >