Voltage

The only wallet with a HODL button.

Voltage is a GUI for c-lightning on macOS.

If you've got a c-lightning node and a Mac, then this project might be of remote interest to you!

Current Status

Right now Voltage has six tabs:

• Money - Send and receieve on-chain Bitcoin, create and pay lightning invoices
• Invoices - Corresponds to lightning-cli listinvoices
• Payments - Corresponds to lightning-cli listpayments
• Peers - Corresponds to lightning-cli listpeers
• Channels - Corresponds to lightning-cli listchannels
• Info - Corresponds to lightning-cli getinfo

Please be aware that there are no confirmations when you receive testnet Bitcoin. Just hit the reload button after the next block is found and your balances will be updated.

Short Term Goals

• Receive on-chain payments
• Send on-chain payments
• Open lightning channels
• Close lightning channels
• Create lightning invoices
• Pay lightning invoices
• Make all of the lists sortable
• Integrate CoreBitcoin
• Getinfo from the "About Voltage" menu item maybe?
• Make RPC calls in a background thread
• Use NotificationCenter to handle RPC errors
• Pre-load all tables when application launches (meh)
• Pre-load receiving address for "Get Money" button
• Validate lightning invoices
• Use a single socket instance for all RPC calls bad idea
• Remove Faker as a dependency in the Voltage target. It should only be required in tests.
• Figure out code signing
• Store transaction data locally (meh)

Usage

Local

Voltage requires an active c-lightning node. If you are running c-lightning on your Mac, the default settings should work for you.

If you are using a non-standard data directory for c-lightning, you can use the preferences pane to change the socket path.

Remote

If you're like me and you don't have bitcoind and/or c-lightning on your laptop, fret not! c-lightning can be operated remotely over an SSH tunnel.

If you have public key authentication setup between your local machine and your remote c-lightning server, you can configure Voltage to connect to your remote node. Just go to "Voltage" -> "Preferences..." and click on "Remote". Then enter the necessary information and hit "Test Connection."

There are still some bugs to work out. If you have problems, just setup an ssh tunnel to your node's socket manually.

The following command will tunnel to the socket located at /home/user/.lightning/lightning-rpc on your remote machine and link to a new socket on your local machine at ~/.lightning/lightning-rpc:

ssh -NL ~/.lightning/lightning-rpc:/home/user/.lightning/lightning-rpc user@example.com

Once you've established the socket, Voltage should work. If you setup the socket in a location other than ~/.lightning/lightning-rpc you'll need to update the "Socket Path" setting in the preferences pane.

Errors

Common errors include:

Error code: -9988(0x-2704), No such file or directory

The path to the c-lightning socket as defined in Preferences does not lead to a file.

Error code: -9988(0x-2704), Connection refused

Voltage found the socket, but the connection was refused. This usually happens if you are using an ssh tunnel to connect to c-lightning and the session gets disconnected.

Voltage.SocketError.no_response

The RPC query was sent, but zero bytes of data came back over the wire. Check to make sure c-lightning is running.

SSH Tunnell Error

channel 1: open failed: connect failed: open failed - double check your "Remote Socket Path"

Contributing

Pull requests are welcome! Criticism encouraged!

License

BSD 3-Clause