Bitcoin Forum

Hi,

I have this setup: Blue Wallet on my cellphone and Electrum as cold wallet + tails.

I created a transaction on Blue wallet, tried to read QRcode of .pbst from Electrum and get this error:

https://postimg.cc/cvk0Pq7W

How can i solve this?



Thanks in advance.

Electrum should be able to read both transactions.
Try signing the transaction and assiging a hash to it via a created transaction
Let's know if it works after you tried.

The exception error (enclosed in brackets) should be the literal description of the error.
In your case, Electrum cannot parse the PSBT in Blue Wallet's QR Code.

Notice that Blue Wallet's QR is animated (URv1 or URv2 QR code)?
Electrum doesn't support such QR code.
You can follow this issue to see if it will be implemented in the future: https://github.com/spesmilo/electrum/issues/7905 (https://github.com/spesmilo/electrum/issues/7905)

For now, I'd suggest to use Electrum as watching-only wallet for compatibility, its new Android version's GUI is better than the previous IMO.

If you have a second PC connected to the internet (laptop or desktop machine), you could install Electrum on it and use it to create and broadcast your transactions that you will need to sign with your cold wallet. I was never a fan of Electrum's mobile wallet, but like nc50lc mentioned, the newest versions have improved somewhat.

Yes it has really improved. Do you know that almost everything you can do on the best mobile wallet, you can do all on Electrum mobile wallet. Coin control, singing of bitcoin address message are both also on mobile Electrum now. I see it as one of the the best mobile wallets. I do not know the reason someone will use Electrum as cold wallet and later use another wallet as watch-only wallet when Electrum can also be used as the watch-only wallet.

Unless their developers changed something recently, I don't like how they implemented coin control. Their take on coin control is to require users to freeze the UTXOs they don't want to spend, leaving only that/those they wish to spend in a new transaction. I am not sure why they have done only that because it's not the best way. Why would I have to go through dozens of my UTXOs and freeze them before being left with those I wish to spend? The proper way is how they handled it in their desktop wallet. You simply select the UTXO to spend from and that's it.

Freezing certain coins is a valid use case, but it's not real coin control as they are different.

I have not used coin control on mobile Electrum before but I have used it on the desktop version. I will say that the desktop version is better. I later open my Electrum wallet on my phone and realized that what you said is right. I was unable to select some coins or UTXOs that I want to spend but I was only able to freeze the UTXOs. Although both are convenient for me.

so base43 encoding error The problem can be solved by re-encoding the file to this format or using a wallet that supports it such as Sparrow as Cold Storage. The easiest solution is to download Electrum for Android.

Having a freezing option is obviously better than not having any coin control features at all and having to rely on the software to select which UTXOs it wants to spend based on certain conditions. Btw, since you just had a look at the freezing option, you might be able to answer the following: Does Electrum Android offer a freeze all UTXOs option or do you have to manually tick and select each UTXO yourself?

Sparrow has other problems. It's related to the scanning of SeedQRs, at least from the screens of hardware wallets. It was my wallet of choice as a companion app to my Jade but I never got it to work. It's a long and painful process trying to get Sparrow to scan QRs. 

Thank you all that take some time to help me.

I will try to use electrum android app to create .psbt and sign on cold wallet.