Balzac

A domain-specific language to write Bitcoin transactions, based on the paper A formal model of Bitcoin transactions presented at Financial Cryptography and Data Security 2018.

Online editor: balzac-lang.xyz

Documentation: docs.balzac-lang.xyz

Quickstart

docker pull balzaclang/balzac:latest
docker run --rm -p 8080:8080 --name balzac balzaclang/balzac:latest

Setup

Execute the script install-deps.sh or alternatively follow these steps:

Install a customized version of BitcoinJ

echo "Cloning https://github.com/natzei/bitcoinj.git"
git -C $HOME clone https://github.com/natzei/bitcoinj.git
git -C $HOME/bitcoinj checkout lib
gradle -p $HOME/bitcoinj install -x test

Compare versions

Install

export MAVEN_OPTS="--add-opens java.base/java.lang=ALL-UNNAMED"
mvn -f xyz.balzaclang.balzac.parent/ -U clean install

Run Balzac

In order to run Balzac locally you can

• build on your machine and run using Maven + Jetty
• build on your machine and load the war (saved into xyz.balzaclang.balzac.web/target/) inside any web container (e.g. Tomcat)
• build on your machine and run in Docker (see docker/Dockerfile-slim to create the image)
• download from DockerHub and run in Docker

The following commands assume this variable has been set:

export MAVEN_OPTS="--add-opens java.base/java.lang=ALL-UNNAMED"

Build a WAR package

mvn -f xyz.balzaclang.balzac.web/ package

The WAR package is saved in xyz.balzaclang.balzac.web/target/.

Run with Maven + Jetty

mvn -f xyz.balzaclang.balzac.web/ jetty:run

Or alternatively

mvn -f xyz.balzaclang.balzac.web/ jetty:run-war

Build Docker image

Assuming the WAR package is saved in xyz.balzaclang.balzac.web/target/, you can generate the Docker image by executing:

docker build -t balzaclang/balzac:latest .

You can specify a custom war file by using the build-arg war=<path> parameter.

Prebuilt image

DockerHub: balzaclang/balzac

docker pull balzaclang/balzac:latest

Balzac is available for the following architectures:

- linux/amd64
- linux/arm/v7
- linux/arm64

Docker run

docker run --rm -p 8080:8080 --name balzac balzaclang/balzac:latest

Development

The project is currently developed using Eclipse IDE for Java and DSL Developers (generally the latest version). Install it using the Eclipse installer.

Dependencies

• Xsemantics
• Jacoco (optional)

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