Before starting this tutorial, beware because theres vulnerabilities in the multisignature. I only had to follow this tutorial to do it without issues/bugs. This is not a common multisig method it does by secret-splitting methods.

Step 1 - Creating wallets

• ./monerod --offline (you need to create new keypairs for a multisig)

Inside the wallet's console

• set inactivity-lock-timeout 0 (deactivate the wallet autolock feature)
• set enable-multisig-experimental 1 (to unlock multisig)

Step 2 - Preparing the multisig

• prepare_multisig will return you an "intitialization key" (starting with MultisigxV2R) . Do it on each wallet you want in the multisig and note theses somewhere.

Step 3 - Make the multisig

• make_multisig (how many keys to unlock the signature) init-key-2 init-key-3 (ect..).

Be sure you do this on every wallet. Don't add the init-key belonging to the same wallet (add init-key of the wallet 2 and 3 to the wallet 1 ect..)

The console will again return you a new key (starting with MultisigxV2R) on each wallet you need to note somewhere.

Step 4 - Exchanging multisig keys

• exchange_multisig_keys key-2 key-3

The console will again return you a new key (starting with MultisigxV2R) on each wallet you need to note somewhere.

Step 4.1 - Exchanging (a second time multisig keys)

• exchange_multisig_keys key-2 key-3

The console will return you the multisig's type and the multisig's address

Once you did that (on every wallet) it will diplay:

• Multisig wallet has been successfully created.
• Current wallet type: n/n
• multisig address: (a xmr address)

Step 5 - Receive funds

Just generate a new address by typing

• address new

Step 6 - Sign a multisig transaction

In first, refresh your balance

• refresh

6.1 Exporting partial key-images

On every wallet, do:

• export_musig_info a-filename-you-choose

6.2 Importing partial key-images

Now import partial key images in every wallet

• import_multisig_info a-filename-you-choose a-filename-you-choose (you can add multiple keys at the same time)

Once it's done your spendable outputs will be verified & ready to be spent.

6.3 Signing the transaction

• transfer <address> <amount>

Once the transaction is "confirmed" by entering the password, it'll generate a partially signed transaction with the multisig_monero_tx filename. Now sign the transaction with each wallet (required to treshold):

• sign_multisig multisig_monero_tx

And then you can broadcast it

• submit_multisig multisig_monero_tx

It'll return the TransactionID

Step 7 - Backup a multisig wallet

A multisig mnemonic is very specific. It's not words it's a long key so beware of how you store it.

• seed

Write the key somewhere safe

7.1 Restoring the multisig wallet

• ./monerod --restore-multisig-wallet

Write the key when it's prompted, refresh the wallet and go back to the Step 6.1 if you want to spend funds.

Here's an example of a 2/3 multisig