Electrum

Electrum is an easy-to-use Bitcoin client. It protects you from losing coins in a backup mistake or computer failure, because your wallet can be recovered from a secret phrase that you can write on paper or learn by heart. There is no waiting time when you start the client, because it does not download the Bitcoin block chain.

Features

• Instant on: Your client does not download the blockchain, it uses a remote server.
• Forgiving: Your wallet can be recovered from a secret seed.
• Safe: Your seed or private keys are not sent to the server. Information received from the server is verified using SPV.
• No downtimes: Several public servers are available, you can switch instantly.
• Ubiquitous: You can use the same wallet on different computers, it will auto-synchronize.
• Cold Storage: You can have secure offline wallets and still safely spend from an online computer.
• Open: You can export your private keys into other Bitcoin clients.
• Tested and audited: Electrum is open source and was first released in November 2011.
• Available for Mac, Linux, Windows, and Android.

• Minor bugfixes
• Updated ledger plugin
• Sort inputs/outputs lexicographically (BIP-LI01)
• Patch a bug with payment requests
• Improved logic for the network layer.
• More efficient coin selection. Spend oldest coins first, and minimize the number of transaction inputs.
• Plugins are loaded independently of the GUI. As a result, Openalias, TrustedCoin, and Trezor wallets can be used with the command line.
• The command line has been refactored:
  • Arguments are parsed with argparse.
  • The inline help includes a description of options.
  • Some commands have been renamed. Notably, 'mktx' and 'payto' have been merged into a single command, with a --broadcast option. Type 'electrum --help' for a complete overview.
• The command line accepts the '!' syntax to send the maximum amount available. It can be combined with the '--from' option.
• The command line also accepts a '?' shortcut for private keys arguments, that triggers a prompt.
• Payment requests can be managed with the command line, using the following commands: 'addrequest', 'rmrequest', 'listrequests'. Payment requests can be signed with a SSL certificate, and published as bip70 files in a public web directory. To see the relevant configuration variables, type 'electrum addrequest --help'
• Commands can be called with jsonrpc, using the 'jsonrpc' GUI. The jsonrpc interface may be called by PHP.