Seed phrase secure storage ideas, like multisig?

[eiger3970]

Hello,
from various information sources, by summary concludes the current seed phrase storage as best:
2 of 3 multisig.

My understanding is a seed phrase will have 24 words.
These 24 words are then engraved onto 3 stainless steel hexkeys, so when 2 of these hex keys are brought together, the 24 words are revealed.
Then the user needs to enter the passphrase to fully recover the wallet.

So, is there a cold wallet with the software to make the multisig, as I don't know how to 'split' the 24 words into the 3 engraved stainless steel hexkeys?

[OcTradism]

Your seed phrase can have 12, 15, 18, 21 or 24 words, that depends on bits of randomness when you create your wallet by yourself or with a wallet software.

Multisig wallet or cold storage wallet can be good for you, and you can see guides below to understand steps to create them. With multisig wallet, you will have to pay more transaction fee than a single signature wallet.

There is another type, 2FA wallet like with Electrum wallet software. You will have to pay extra fee to Trusted coin which provides 2FA for your wallet.

[GUIDE] How to Safely Download and Verify Electrum
Electrum wallet types
Creating a multisig wallet
Creating a cold storage wallet

How to back up a seed phrase?

[nc50lc]

from various information sources, by summary concludes the current seed phrase storage as best:
2 of 3 multisig.
-snip-
These 24 words are then engraved onto 3 stainless steel hexkeys, so when 2 of these hex keys are brought together, the 24 words are revealed.
Then the user needs to enter the passphrase to fully recover the wallet.

I have a feeling that you're mixing things up since MultiSig isn't a "seed phrase storage" scheme but a bitcoin locking script that can only be spent by providing the required number of signatures.
"MultiSig" stands for "Multiple Signatures".

By the given example, it looks like you're talking about "SLIP39" (github.com/satoshilabs/slips/blob/master/slip-0039.md).
Browser example (for testing, don't use in real wallets): iancoleman.io/shamir39/

My understanding is a seed phrase will have 24 words.

For 2-of-3 MultiSig Setup, you'll be backing-up three separate seed phrases.
That "2-of-3" signifies: the 'number of required signatures to sign transactions' - of - 'total number of cosigners'.
Since it's "of-3", you'll be creating three cosigners wallets which contain their own seed phrase.

12 words per cosigner is safe, but if you can backup 24 words in a single steel hexkeys and the wallet can generate 24 words, then go for it.

Read the links in the reply above for more information about MultiSig wallet setup.

[Marvelman]

So, is there a cold wallet with the software to make the multisig, as I don't know how to 'split' the 24 words into the 3 engraved stainless steel hexkeys?

OP, you probably mean "Shamir's Secret Sharing Scheme". SSSS, as it's known, allows folks to split up their wallet recovery phrase into multiple parts called shares.  Rather than keeping that long string of words in one place, the shares let you spread the information around for safekeeping.  Some wallets build the scheme right in so splitting and recombining happens behind the scenes.  Takes the hassle out of managing the shares yourself, which helps avoid sloppiness.

[Findingnemo]

Hello,
from various information sources, by summary concludes the current seed phrase storage as best:
2 of 3 multisig.

My understanding is a seed phrase will have 24 words.
These 24 words are then engraved onto 3 stainless steel hexkeys, so when 2 of these hex keys are brought together, the 24 words are revealed.
Then the user needs to enter the passphrase to fully recover the wallet.

So, is there a cold wallet with the software to make the multisig, as I don't know how to 'split' the 24 words into the 3 engraved stainless steel hexkeys?

If it's 2 of 3 multi Sig wallet then it would have three seeds, so you need to store three of them secure in whatever way you want to and the purpose of multiple signature wallet is to avoid single point of failure so if one of your seeds exposed then it would still require another 1 from the remaining two to have access to the funds.

Passphrase is extended custom seed word that is to increase the security further so if it's 24 seeds then the passphrase is 25th word, without it you would create different wallet and addresses.

Kind of confused what's really the purpose, is it about finding ways to store the seed words? Then why we are talking about multi Sig and passphrase.

[Saint-loup]

Hello,
from various information sources, by summary concludes the current seed phrase storage as best:
2 of 3 multisig.

My understanding is a seed phrase will have 24 words.
These 24 words are then engraved onto 3 stainless steel hexkeys, so when 2 of these hex keys are brought together, the 24 words are revealed.
Then the user needs to enter the passphrase to fully recover the wallet.

So, is there a cold wallet with the software to make the multisig, as I don't know how to 'split' the 24 words into the 3 engraved stainless steel hexkeys?

You are obviously talking about a 2 of 3 Shamir's Secret Sharing Scheme for splitting your seed instead of a 2 of 3 multisig wallet. With a multisig wallet you won't need to reveal a common seed. Wallets belonging to the scheme will just need to "cosign" transactions, and being enough cosigners to reach the defined threshold.
With a SSSS you will just split your actual seed into several shares, and transactions won't need to be cosigned for being valid.
You can use Trezor wallets for that, the iancoleman tool https://iancoleman.io/slip39/ or some softwares https://github.com/satoshilabs/slips/blob/master/slip-0039.md#other-implementations
Electrum accepts slip39 seeds but is not able to generate them unfortunately.