Marlowe

This repository contains the design of Marlowe, a DSL for describing smart-contracts that can be enforced by scripts deployed on a cryptocurrency's blockchain, and some tools for analysing and simulating the execution of contracts written in the DSL. The following are some of the main files included in this repository:

• src/Semantics.hs — contains the small-step semantics of DSL (stepBlock function), together with a simple driver (driver function).
• src/ContractFormatter.hs — contains the implementation of a formatter for scdsl code.
• src/SmartInputs.hs — contains code that calculates possible inputs for a given input, state, contract, and observables value.
• src/DepositIncentive.hs — contains an example contract for incentivising saving.
• src/CrowdFunding.hs — contains an example contract for crowd-funding limited to 4 participants.
• src/Escrow.hs — contains an example contract for an escrow payment.

A full description of the v1.3 version was presented at ISoLA 2018, and the paper is available here.

Meadow

Meadow is a browser-based demo prototype that supports graphical editing of smart-contracts (thanks to the Blockly library) and block by block simulation of their execution (translated from the semantics thanks to the Haste compiler).

Meadow is available at: https://input-output-hk.github.io/marlowe/ and a video showing Meadow in Action is here: https://youtu.be/_loz70XkHM8

The sources for Meadow are available in the meadow folder.

Build on MacOS

Requirements: Homebrew, Haskell Stack 1.6 or later.

Install Haskell Stack if you haven't already

$ brew install haskell-stack

$ brew install glpk
$ stack setup
$ stack build

Stable branch

The master branch contains the latest developments of Marlowe, because of this, the Haskell semantics, the Coq formalisation, and the Meadow imlementation may be out of sync with each other in this branch. The stable branch marks a previous version of Marlowe where the different components are in sync.