btcwallet is a daemon handling bitcoin wallet functionality for a single user. It acts as both an RPC client to btcd and an RPC server for wallet clients and legacy RPC applications.
Public and private keys are derived using the hierarchical
deterministic format described by
Unencrypted private keys are not supported and are never written to
disk. btcwallet uses the
m/44'/<coin type>'/<account>'/<branch>/<address index>
HD path for all derived addresses, as described by
Due to the sensitive nature of public data in a BIP0032 wallet, btcwallet provides the option of encrypting not just private keys, but public data as well. This is intended to thwart privacy risks where a wallet file is compromised without exposing all current and future addresses (public keys) managed by the wallet. While access to this information would not allow an attacker to spend or steal coins, it does mean they could track all transactions involving your addresses and therefore know your exact balance. In a future release, public data encryption will extend to transactions as well.
btcwallet is not an SPV client and requires connecting to a local or remote btcd instance for asynchronous blockchain queries and notifications over websockets. Full btcd installation instructions can be found here. An alternative SPV mode that is compatible with btcd and Bitcoin Core is planned for a future release.
Wallet clients can use one of two RPC servers:
A legacy JSON-RPC server mostly compatible with Bitcoin Core
The JSON-RPC server exists to ease the migration of wallet applications from Core, but complete compatibility is not guaranteed. Some portions of the API (and especially accounts) have to work differently due to other design decisions (mostly due to BIP0044). However, if you find a compatibility issue and feel that it could be reasonably supported, please report an issue. This server is enabled by default.
An experimental gRPC server
The gRPC server uses a new API built for btcwallet, but the API is not stabilized and the server is feature gated behind a config option (
--experimentalrpclisten). If you don't mind applications breaking due to API changes, don't want to deal with issues of the legacy API, or need notifications for changes to the wallet, this is the RPC server to use. The gRPC server is documented here.
Installation and updating
Windows - MSIs Available
Install the latest MSIs available here:
Windows/Linux/BSD/POSIX - Build from source
Building or updating from source requires the following build dependencies:
Go 1.5 or 1.6
Installation instructions can be found here: http://golang.org/doc/install. It is recommended to add
PATHat this point.
Note: If you are using Go 1.5, you must manually enable the vendor experiment by setting the
GO15VENDOREXPERIMENTenvironment variable to
1. This step is not required for Go 1.6.
Glide is used to manage project dependencies and provide reproducible builds. To install:
go get -u github.com/Masterminds/glide
Unfortunately, the use of
glide prevents a handy tool such as
go get from
automatically downloading, building, and installing the source in a single
command. Instead, the latest project and dependency sources must be first
obtained manually with
glide, and then
go is used to build and
install the project.
Getting the source:
For a first time installation, the project and dependency sources can be
obtained manually with
glide (create directories as needed):
git clone https://github.com/btcsuite/btcwallet $GOPATH/src/github.com/btcsuite/btcwallet cd $GOPATH/src/github.com/btcsuite/btcwallet glide install
To update an existing source tree, pull the latest changes and install the matching dependencies:
cd $GOPATH/src/github.com/btcsuite/btcwallet git pull glide install
go tool is used to build or install (to
GOPATH) the project. Some
example build instructions are provided below (all must run from the
To build and install
btcwallet and all helper commands (in the
$GOPATH/bin/, as well as installing all compiled packages to
$GOPATH/pkg/ (use this if you are unsure which command to run):
go install . ./cmd/...
To build a
btcwallet executable and install it to
To build a
btcwallet executable and place it in the current directory:
The following instructions detail how to get started with btcwallet connecting
to a localhost btcd. Commands should be run in
cmd.exe or PowerShell on
Windows, or any terminal emulator on *nix.
- Run the following command to start btcd:
btcd -u rpcuser -P rpcpass
- Run the following command to create a wallet:
btcwallet -u rpcuser -P rpcpass --create
- Run the following command to start btcwallet:
btcwallet -u rpcuser -P rpcpass
If everything appears to be working, it is recommended at this point to copy the sample btcd and btcwallet configurations and update with your RPC username and password.
PowerShell (Installed from MSI):
PS> cp "$env:ProgramFiles\Btcd Suite\Btcd\sample-btcd.conf" $env:LOCALAPPDATA\Btcd\btcd.conf PS> cp "$env:ProgramFiles\Btcd Suite\Btcwallet\sample-btcwallet.conf" $env:LOCALAPPDATA\Btcwallet\btcwallet.conf PS> $editor $env:LOCALAPPDATA\Btcd\btcd.conf PS> $editor $env:LOCALAPPDATA\Btcwallet\btcwallet.conf
PowerShell (Installed from source):
PS> cp $env:GOPATH\src\github.com\btcsuite\btcd\sample-btcd.conf $env:LOCALAPPDATA\Btcd\btcd.conf PS> cp $env:GOPATH\src\github.com\btcsuite\btcwallet\sample-btcwallet.conf $env:LOCALAPPDATA\Btcwallet\btcwallet.conf PS> $editor $env:LOCALAPPDATA\Btcd\btcd.conf PS> $editor $env:LOCALAPPDATA\Btcwallet\btcwallet.conf
Linux/BSD/POSIX (Installed from source):
$ cp $GOPATH/src/github.com/btcsuite/btcd/sample-btcd.conf ~/.btcd/btcd.conf $ cp $GOPATH/src/github.com/btcsuite/btcwallet/sample-btcwallet.conf ~/.btcwallet/btcwallet.conf $ $EDITOR ~/.btcd/btcd.conf $ $EDITOR ~/.btcwallet/btcwallet.conf
The integrated github issue tracker is used for this project.
GPG Verification Key
All official release tags are signed by Conformal so users can ensure the code has not been tampered with and is coming from the btcsuite developers. To verify the signature perform the following:
Download the public key from the Conformal website at https://opensource.conformal.com/GIT-GPG-KEY-conformal.txt
Import the public key into your GPG keyring:
gpg --import GIT-GPG-KEY-conformal.txt
Verify the release tag with the following command where
TAG_NAMEis a placeholder for the specific tag:
git tag -v TAG_NAME
btcwallet is licensed under the liberal ISC License.