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dcrwallet

dcrwallet is a daemon handling Decred wallet functionality. All interaction with the wallet is performed over RPC.

Public and private keys are derived using the hierarchical deterministic format described by BIP0032. Unencrypted private keys are not supported and are never written to disk. dcrwallet uses the m/44'/<coin type>'/<account>'/<branch>/<address index> HD path for all derived addresses, as described by BIP0044.

dcrwallet provides two modes of operation to connect to the Decred network. The first (and default) is to communicate with a single trusted dcrd instance using JSON-RPC. The second is a privacy-preserving Simplified Payment Verification (SPV) mode (enabled with the --spv flag) where the wallet connects either to specified peers (with --spvconnect) or peers discovered from seeders and other peers. Both modes can be switched between with just a restart of the wallet. It is advised to avoid SPV mode for heavily-used wallets which require downloading most blocks regardless.

Not all functionality is available when running in SPV mode. Some of these features may become available in future versions, but only if a consensus vote passes to activate the required changes. Currently, the following features are disabled or unavailable to SPV wallets:

Wallet clients interact with the wallet using one of two RPC servers:

  1. A JSON-RPC server inspired by the Bitcoin Core rpc server

    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 as long as a username and password are provided.

  2. A gRPC server

    The gRPC server uses a new API built for dcrwallet, but the API is not stabilized. This server is enabled by default and may be disabled with the config option --nogrpc. If you don't mind applications breaking due to API changes, don't want to deal with issues of the JSON-RPC API, or need notifications for changes to the wallet, this is the RPC server to use. The gRPC server is documented here.

Installing and updating

Binaries (Windows/Linux/macOS)

Binary releases are provided for common operating systems and architectures. Please note that dcrwallet is CLI only. It is included in the CLI app suite. If you would prefer a graphical user interface (GUI) instead, consider downloading the GUI wallet Decrediton.

https://decred.org/downloads/

Build from source (all platforms)

Getting Started

dcrwallet can connect to the Decred blockchain using either dcrd or by running in Simple Payment Verification (SPV) mode. Commands should be run in cmd.exe or PowerShell on Windows, or any terminal emulator on *nix.

dcrwallet --create
dcrwallet --spv

dcrwallet will find external full node peers. It will take a few minutes to download the blockchain headers and filters, but it will not download full blocks.

You will need to install both dcrd and dcrctl. dcrctl is the client that controls dcrd and dcrwallet via remote procedure call (RPC).

Please follow the instructions in the documentation, beginning with Startup Basics

Running Tests

All tests may be run using the script run_tests.sh. Generally, Decred only supports the current and previous major versions of Go.

./run_tests.sh

Contact

If you have any further questions you can find us at:

https://decred.org/community/

Issue Tracker

The integrated github issue tracker is used for this project.

Documentation

The documentation for dcrwallet is a work-in-progress. It is located in the docs folder.

Additional documentation can be found on docs.decred.org.

License

dcrwallet is licensed under the liberal ISC License.