DISCLAIMER: THIS PROJECT IS EXPERIMENTAL BASED ON A PROTOCOL WHICH IS STILL EVOLVING EVERYDAY. USE WITH CAUTION.

I WILL TAKE NO ATTEMPT AT MAINTAINING BACKWARD COMPATIBILITY AT THIS STAGE.

Smart contracts are an often touted feature of cryptographic currencysystems such as Bitcoin, but they have yet to see widespread financial use.Two of the biggest hurdles to their implementation and adoption have beenscalability of the smart contracts, and the difficulty in getting data externalto the curency system into the smart contract. Privacy of the contract hasbeen another issue to date. Discreet Log Contracts are a system whichaddresses the scalability and privacy concerns and seeks to minimize thetrust required in the oracle which provides external data. The contracts arediscreet in that external observers cannot detect the presence of the contractin the transaction log. They also hinge on knowledge of adiscretelogarithm,which is a plus.

Source: Discreet Log Contracts by Thaddeus Dryja.

This repository hosts repository is an implementation of the idea, with a variant: We use adaptor signatures.

Adaptor signatures allows us to simplify the protocol and increase privacy. Without adaptor signatures:

• In a non cooperative case situation, a DLC takes 4 transactions, 3 transactions in a cooperative case.
• The parties need to monitor the blockchain actively to make sure the other party does not cheat.

With adaptor signatures:

• Cooperative, or non-cooperative, a DLC takes only 3 transactions and less roundtrip of communications between the parties.
• The parties don't have to monitor the blockchain, as they have no way to cheat.

This repository contains:

• A library NDLC, still not released on Nuget, but which aims to implement the specification.
• A CLI program NDLC.CLI, which allows you be an oracle and make DLC contract with other peers.

You can build using .NET Core SDK 3.1 or higher.

We intend to release easy to use packages in the future, but this work is still experimental.

You can build with:

cd NDLC.CLI
dotnet build -c Release

You can run with

cd NDLC.CLI
dotnet run -c Release

By default, dotnet run also build, so if you just want to run, you can use.

cd NDLC.CLI
dotnet run -c Release --no-build

You need to pass parameters to the CLI interface after --.

cd NDLC.CLI
dotnet run -c Release --no-build -- info

We will make that easier when the protocol and this repository stabilizes.

Please go to our Documentation page.

MIT