Electrum was created by Thomas Voegtlin in November 2011, as a result, various developers have contributed to its source code. A software wallet that was designed to give users the freedom to manage their funds and private keys in a secure manner. Electrum allows you to store your private keys offline and integrates with some hardware wallets like TREZOR or Ledger products. Electrum utilizes decentralized servers to ensure minimal to no downtime. Electrum, found online at Electrum.org, has been a popular bitcoin wallet since launching in November 2011. The encrypted wallet protects your bitcoins behind a password and features surprisingly simple code, written in Python. That code is available open source to the public.