Jan 07, · The transaction itself could be seen by a hacker, but the keys that provide access to funds are safe. Now, let’s look at three three most popular options for storing bitcoin offline. Paper Wallets. A paper wallet is a piece of paper with the private and public keys written on it. It is printed out using a bitcoin paper wallet creation tool. Feb 08, · To do so, sign the Bitcoin transaction with Electrum like you normally would, but don’t broadcast it with Electrum. Using their BTC address, I generated an offline transaction with my Author: Grubles. Jan 09, · Part 5 - Sign the transaction. Step 1: Once on your offline computer, open the Electrum wallet Step 2: Go to "Tools" Step 3: Click "Load transaction" Step 4: And choose "From file" Step 5: Insert the USB stick in your computer and load the previously saved unsigned transaction from it. Step 6: Your transaction will be loaded. Click "Sign" to Author: Antonio Madeira.
How to sign bitcoin transaction offlinesign bitcoin transaction offline - Stack Overflow
You could do it by manually typing them out, but that seems overly difficult. I currently use a USB stick to copy unsigned transactions to an offline computer where I sign them, then use the same USB stick to copy them back to an online computer.
But today I read arstechnica. I would like to find a way to use QRcodes to transmit the required information between computers rather than a USB stick to avoid this risk of infection. The unsigned raw transaction itself is small enough to fit into a QRcode, but the offline computer also needs access to the input transactions for the transaction it is trying to sign, which I currently provide by copying a wallet file over as well. Wallet files are too big to fit in a QRcode. The link to the explanatory page appears to be outdated again.
This makes it so you can do this: Make an unsigned transaction in armory Create a QR code from it Scan it with phone so far, QR Droid and Barcode Scanner work Take phone to offline wallet Display QR code for unsigned transaction on phone using history in QR droid works well Scan using webcam in offline wallet computer I successfully did this with the zbar Linux application in Ubuntu - package details to follow Sign tx with offline armory Display QR code for signed tx more packages to follow Scan with new android app to broadcast This is almost done - the app is currently peering with bitcoin nodes and will scan the QR code and send it to a broadcasting activity, but the broadcast part and the parsing of the armory format remains.
Watch the video Python code here Android app code here. Hank Hank 1 1 silver badge 3 3 bronze badges. This explanation doesn't help the asker too much, could you expand on the "creating a transaction" and "signing tx with offline armory" bits?
I added a video demoing the entire process. It assumes you know how to make an offline transaction in armory, which is described here. I'll be posting the scripts soon and linking from the video and probably here. Sign up or log in Sign up using Google. Sign up using Facebook.
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