Writing Fully-Concurrent Smart Contracts in Rholang

Joshy Orndorff
RChain Cooperative
08 October 2018

Get Prepared

Cryptofex IDE

https://cryptofex.io/download/

RChain node (RNode)

https://github.com/rchain/rchain/releases/tag/v0.6.4

Rchain.cloud

Main site: https://rchain.cloud

Mirror: rchaincloud.inblock.io

Host your own: https://youtu.be/_Jzl9WqfMrQ

Follow These Slides:

https://joshorndorff.github.io/SFBlockchainWeek-Presentation/index.html

# Tentative Plan * 3:00 Setup, Intro, RChain Platform * 3:30 Rholang Fundamentals * 4:00 Rholang Exercises and Practice * 4:30 Full Dapp Demos and Lab Time Bottom line: Your agenda is my agenda

RChain Value Adds

The Rho VM

BuildingBlocks

Sends

Receives

Tuplespace Semantics

Tuplespace

Process Pool

Rholang Syntax

Rholang expresses the Rho VM plus ~~some~~ several conveniences.

Channels and Processes

# Write Some Rholang * Simple comm event * Powerbox * Contracts, Persistence * Unforgeable names Like group learning? Come to my office hours! ----- # Rholang Exercises * Tutorial is a great place to start * Website version: [https://www.rchain.coop/learn-rholang](https://www.rchain.coop/learn-rholang) * Github version: [http://guthub.com/joshorndorff/LearnRholangByExample](http://guthub.com/joshorndorff/LearnRholangByExample) * Beginner * Number doubler (Arithmetic) * Hello user (String operations) * Absolute value (`if` / `else`) * Intermediate * max / min (lists, recursion) * factorial (recursion) * Expert * Binary search * Patience Game

Nth Caller Dapp

Call in now, 10th caller wins concert tickets!

Nth Caller Architecture

Demonstration
RChain-API: https://github.com/rchain/rchain-api
Build it yourself: https://github.com/JoshOrndorff/nth-caller-game

Status Dapp

Greg M: We need to reboot social media, and express sentiment on-chain

(Name registry coming this week!)

RSign Browser Extension

Signatures easier for developers and users
More realistic security model
Still under active development
https://github.com/dckc/RSign

# Stay Involved ## Commons * [Join the coop](https://www.rchain.coop/community) * Chat in [discord](https://discord.gg/fvY8qhx) * RChain [forum](https://forum.rchain.coop/) ## Events * Attend my [office hours](https://zoom.us/j/6853551826) Thursdays at 7:00 AM San Francisco time * Attend [Colab rholang sessions](https://zoom.us/j/6853551826) Tuesdays at 1:00 PM San Francisco time * Attend [Colab RNode sessions](https://zoom.us/j/6853551826) Thursdays at 1:00 PM San Francisco time