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1  Bitcoin / Electrum / Re: 2fa wallets cannot sign as cosigners in other multisig wallets on: February 01, 2025, 04:39:35 AM
Quote from: nc50lc on February 01, 2025, 04:24:42 AM
Quote from: arelihp on February 01, 2025, 03:35:04 AM
The current version seems no longer accept 2fa wallet in the 2 of 2 setup (I did that using ancient version, and at that time the 2fa wallet can co-sign PBST/QR code).
This statement tells me that you're in a different scenario than the OP in the thread that I've linked.

However, upon testing Electrum v3.3.6 (and v3.3.5), your description doesn't seem to match that version's behavior.
  • Firstly, if you setup a 2-of-2 MultiSig, it wont let you set a "2fa" nor a "2fa-SegWit" wallet's seed as the signer nor cosigner.
  • Secondly, if you've instead used one of its master public key as a cosigner, those versions will not be able to cosign a transaction created by the 2-of-2 MultiSig wallet just like in the new version.
  • Thirdly, there doesn't seem to be a bug that could cause it in that version.

In case of point 2 (the "secondly" part), you can try the method in my old reply about recovering its pair master private key to be used as the cosigner.
But something tells me that there's more to this because of how you remembered things in 2019.
Try that first, then reply with the result.

Thanks for taking a look. I cannot remember very clearly what happened in 2019.  The 2 of 2 wallet I'm trying to work on: I have first seed (valid as I managed to restore other wallets), and the second xpub coincides with the first xpub of my 2fa wallet, but I cannot input the 2fa wallet phrases to restore (electrum says it doesn't accept this format in 2 of 2 restoration) .

So it should be that I somehow used that 2fa wallet as cosigner in older versions in2019.

I don't recall PBST very clearly. I was using QR code back then and it was successfully cosigned.  https://blockstream.info/tx/e11c16b6fa644926ea3740f430c11c8ab9584d0c5e62603a0017a23e75cbbd3b

Hope this help clarify my issues. Meanwhile I will further look into your posts for background knowledge and potential methods.
2  Bitcoin / Electrum / Re: 2fa wallets cannot sign as cosigners in other multisig wallets on: February 01, 2025, 03:35:04 AM
Quote from: BlackBoss_ on January 31, 2025, 10:38:21 AM
Quote from: arelihp on January 31, 2025, 09:31:14 AM
With an ancient version(3.3.6 no longer able to load any wallets) in 2019 , I established a 2 of 2 multisig wallets, using an 2fa wallets as second cosigner.I have password and 2fa phone and seed for the 2fa wallet, but it just cannot sign the PBST or load the QR code the other cosigner(actually also myself) sent.
If it is a 2FA wallet, and you have troubles now, you can import wallet seed, choose 2FA wallet, but then choose Disable 2FA.

After importing 2FA wallet mnemonic seed, but disable 2FA, you can sign Bitcoin transactions without 2FA from Trustedcoin.

Remove 2FA in Electrum and use Standard Wallet instead.
Quoting the detailed guide on import 2FA wallet, but disable 2FA.
Quote from: Husna QA on January 30, 2024, 03:06:46 PM
2FA Electrum Wallet Recovery

I have just created a sample Electrum wallet with 2FA first (see the current cosigning fee charged by TrustedCoin):



Here's how to recover your 2FA wallet when you lose your authenticator or forget your password:

- Create New Wallet





- Select the Wallet with two-factor authentication option. Click Next.



- In the Create or restore, select I already have a seed.



- Enter the seed phrase of the 2FA wallet you want to restore.
  If you previously used Options by adding custom words, select those Options.



- In the Restore 2FA wallet option, select Keep if you want to use 2FA again or Disable not to use 2FA.
  In this example, I chose Disable.



- Create a new password for the Wallet recovery.



- Here are the results. When reopening the wallet, 2FA will not be requested again because it has been turned off.
  And when you disable 2FA, no cosigning fee will be charged to the transaction.



The following are some examples of screenshots from Electrum Android, where some of the recovery steps are almost the same as the desktop version of Electrum as above;


This can help you to sign your Bitcoin transaction without 2FA, but it costs you more transaction fee than a normal / standard wallet. If you want to save transaction fee, create a new single signature standard wallet, and move all your bitcoin in this 2FA (but disabled) to a new wallet.


THanks. I've already read enough materials to get there. The real problem is after restoring, the new wallet still has 2fa features and cannot sign as cosigner of another 2 of 2 wallet.   

The current version seems no longer accept 2fa wallet in the 2 of 2 setup (I did that using ancient version, and at that time the 2fa wallet can co-sign PBST/QR code). Now whenever you load the cosigner's file it just shows sign button being disabled
3  Bitcoin / Electrum / 2fa wallets on: January 31, 2025, 09:31:14 AM
The issue is resolved.
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