Sparrow’s home folder is different depending on the operating system:
On Windows, the %APPDATA% folder can be found by opening File Explorer/Windows Explorer, typing %APPDATA% into the address bar, pressing enter. The Sparrow folder will be in the Roaming or Local subfolder.
Generally, you need to run Sparrow from the command line (or set up an equivalent shortcut).
Sparrow has a number of command line options, for example to change its home folder or use testnet:
Usage: Sparrow [options] Options: --dir, -d Path to Sparrow home folder --help, -h Show usage --level, -l Set log level Possible Values: [ERROR, WARN, INFO, DEBUG, TRACE] --network, -n Network to use Possible Values: [mainnet, testnet, regtest, signet]
> open /Applications/Sparrow.app --args -n testnet
> Sparrow/bin/Sparrow -n testnet
> Sparrow.exe -n testnet
As a fallback, the network (mainnet, testnet, regtest or signet) can also be set using an environment variable
SPARROW_NETWORK. For example:
> export SPARROW_NETWORK=testnet
A final fallback which can be useful when running the Sparrow binary is to create a file called
network-testnet in the Sparrow home folder (see below) to configure the testnet network.
Note that if you are connecting to an Electrum server when using testnet, that server will need to be running on testnet configuration as well.
When not explicitly configured using the command line argument above, Sparrow stores its mainnet config file, log file and wallets in a home folder location appropriate to the operating system:
Testnet, regtest and signet configurations (along with their wallets) are stored in subfolders of Sparrow’s home folder to allow easy switching between networks.
Once Sparrow is running in testnet, you will need to connect it to server or node that is also configured for testnet. Blockstream run a public testnet Electrum server, which can be configured as follows:
Finally, you can receive free testnet bitcoin from a Bitcoin Testnet Faucet like https://testnet-faucet.mempool.co/.
See the section above. You need to run Sparrow with the
-d command line flag. Setting this will cause Sparrow to store its configuration and any wallets at the given location. For example on Windows:
> Sparrow.exe -d D:\sparrow
This feature allows you to store all Sparrow data on removable media making for more plausible deniability.
A transaction’s fee can be increased either by replacing it (RBF), or creating a child transaction (CPFP).
To perform Replace by Fee (RBF), the transaction must:
- Be in the mempool (not yet confirmed)
- Have all inputs enabled for RBF (this is the default for transactions sent by Sparrow)
- Have all inputs from your wallet
If all the above is true, then Sparrow will add a hover icon next to the transaction on the Transactions screen which looks like a hand with a cross above it. You can also right click to ‘Increase Fee’, which takes you to the Send screen with the transaction loaded, from where you can increase the fee (Sparrow may add another UTXO if there is insufficient change).
You can also use CPFP by spending the outputs of the transaction at a higher fee rate.
You may see this error if you are:
- Trying to connect to a Tor .onion address
- Don’t have a Tor proxy configured
- Already running Tor externally on your computer
Sparrow is trying to start its internal Tor, and is failing because Tor is already running.
To solve this, either stop the external Tor, or simply use it as a proxy instead. To do the latter, open Sparrow’s Preferences, go to Server, turn on the Proxy toggle, and set the proxy to localhost:9050. Note that if you do this, your external Tor proxy will need to be running for Sparrow to connect.
If you see this error on a Windows machine, you are probably missing two Microsoft libraries the webcam driver depends on. These standard libraries can be added by installing the Microsoft Visual C++ 2010 Service Pack 1 Redistributable Package MFC Security Update.
Here’s a guide that describes the installation process.
If you have been using the Trezor web wallet at trezor.io, it is likely that when recreating your wallet in Sparrow you need to select the ‘Nested Segwit’ script type.
After this is done, import your Trezor xpub by using the Connected Hardware Wallet option.
Sparrow gets the exchange rate from the configured exchange rate provider, and then multiplies that with your wallet balance internally. Your wallet balance is never shared externally.
If you have a Tor proxy configured, Sparrow will use it to retrieve the exchange rate. You can also turn it off by configuring ‘None’ for the exchange rate provider in the Preferences.
Often, when setting up a watch only wallet only the xpub is known.
In this case, it’s safe to use a default value like
00000000 for the master fingerprint.
The derivation path can be set to the default for the script type (indicated in the textfield prompt) if not known.
Sparrow’s log file is available in the Sparrow home folder, as
You can open it by using the Help > Show Log File menu command.
Go the UTXOs screen (just above the Settings), select the UTXOs you want to spend (use Ctrl/Cmd+Click to select several), and click ‘Send Selected’.
You will need to fill in the address to send to and the label on the Send screen.
Try setting the scaling factor in GNOME explicitly:
gsettings set org.gnome.desktop.interface scaling-factor 2
Yes! The Apache 2 license is very similar to the MIT license, which is used by Bitcoin Core. You can read a reasonable summary here: MIT vs. Apache vs. GPL
Read the instructions here: https://github.com/sparrowwallet/sparrow
Please use the Issues on Github to report an issue. If possible, look in the sparrow.log file in the configuration directory for information helpful in debugging.