It is (was) a paper wallet I generated in bitaddress.org. I generated it online, in my work. The system is protected by firewall and VPN. Then I printed it in the printer connected in the network.
The network is very safe - I will not tell the name of company for privacy. The printer is connected to the system's network.
You made all the mistakes in the book The network is very safe - I will not tell the name of company for privacy. The printer is connected to the system's network.
The main reason to use a paper wallet, is to create cold storage. Cold storage, by definition, has never touched the internet. That's the only way to make sure nobody can ever hack it.
By using an online website on an online computer and a network printer, you've added many risk factors.
Online:
Install Electrum on your PC.
Import your address to create a watch-only wallet.
Preview the transaction, Copy the unsigned transaction. Put it on a USB stick.
Offline and running without hard drive storage:
Get a Linux LIVE DVD. Use Knoppix or Tails for instance, or any other distribution that comes with Electrum pre-installed.
Unplug your internet cable. Close the curtains. Reboot your computer and start up from that DVD. Don't enter any wireless connection password. Keep it offline.
Start Electrum. Import your private key.
Copy your unsigned transaction from the USB stick, load it into Electrum.
CHECK the transaction in Electrum. Check the fees, check the amount, check all destination addresses (character by character).
If all is okay, sign the transaction. Copy it back to your USB stick.
Turn off the computer. That wipes the Live LINUX from memory and all traces are gone.
Online:
Use your normal online Electrum to (check again and) broadcast the transaction.
Install Electrum on your PC.
Import your address to create a watch-only wallet.
Preview the transaction, Copy the unsigned transaction. Put it on a USB stick.
Offline and running without hard drive storage:
Get a Linux LIVE DVD. Use Knoppix or Tails for instance, or any other distribution that comes with Electrum pre-installed.
Unplug your internet cable. Close the curtains. Reboot your computer and start up from that DVD. Don't enter any wireless connection password. Keep it offline.
Start Electrum. Import your private key.
Copy your unsigned transaction from the USB stick, load it into Electrum.
CHECK the transaction in Electrum. Check the fees, check the amount, check all destination addresses (character by character).
If all is okay, sign the transaction. Copy it back to your USB stick.
Turn off the computer. That wipes the Live LINUX from memory and all traces are gone.
Online:
Use your normal online Electrum to (check again and) broadcast the transaction.
