Kohola Decred Wallet

Kohola ("whale" in Hawaiian) is a multi platform Decred wallet application for power users running wallets in dedicated, secure environments. It connects to existing dcrwallet instances; it is particularly tailored to expert users that are familiar with operating advanced setups. For new users, Decrediton is a better choice.

Differences to Decrediton

• It connects to remote dcrwallet, does not keep wallet data on the local machine
• Stores all its configuration in an encrypted form, protecting the user's privacy
• Supports multiple wallet connections
• Essential wallet features only
• Solo staking support
• Tighter desktop UI integration (OS notifications)
• No Electron bloat

Features

Coin control

Security and privacy

Kohola protects connection credentials (RPC certificate) and all other connection information by storing its configuration in encrypted form (using AES). This is optional, but highly recommended, along with a choosing a long, strong passphrase. The passphrase is prompted when the application is started.

Solo staking, governance

UTXO and transaction metadata

Unspent transaction outputs (spendable coins) can be labelled individually in order to keep tabs on the observers associated with a transaction.

Market overview

Implementation

Kohola is a hybrid, cross platform application. Its core that interacts with dcrwallet via gRPC is coded in Golang, while the user interface frontend is implemented in TypeScript, using the React and Redux frameworks. The frontend and the backend communicate over a JSON RPC interface.

Installation

dcrwallet setup

Kohola connects to dcrwallet using GRPC, which can be enabled using the grpclisten option in dcrwallet.conf:

grpclisten=<IP:port>
nogrpc=0
nolegacyrpc=1

By default, dcrwallet listens on port 9111 (mainnet) or 19111 (testnet). The specified IP and port must be accessible from the client machine.

Build

Linux (Debian, Ubuntu)

Dependencies:

• yarn
• golang 1.17
• development packages:

apt-get install libwebkit2gtk-4.0-dev \
   libgtk-3-dev \
   libcairo2-dev \
   libglib2.0-dev \
   libayatana-appindicator3-dev 

On Debian Buster, you'll need to install libappindicator3-dev instead of libayatana-appindicator3-dev for the time being.

./build-linux.sh

There is an experimental Dockerfile to build without having to install the dev dependencies:

docker build -t user/kohola .

MacOS

./build-macos.sh

Windows

TODO - contribution welcome

Development

1. Clone repo

git clone https://github.com/peterzen/kohola

2. Build and run React frontend

cd frontend && yarn
yarn start

3. Open another terminal, and build and run app binary

cd app && go build && ./kohola