Demo of Proof-of-Work Blockchain

Overview

• bash/deploy bash script to deploy the demo
• bash/bcstartn bash script to start the demo
• bash/bcstop bash script to stop the demo
• python/blockchain.py the blockchain class and functions
• python/server.py the flask server
• input/node_ids.csv the input file of port number and node id

Instructions on AWS EC2 deployment

1. cd ~
2. git clone https://github.com/shawenyao/blockchain.git
3. sudo ~/blockchain/bash/deploy
4. curl https://freedns.afraid.org/dynamic/update.php?xxxxxxxxxx
5. Follow the guide (https://certbot.eff.org/) to request https certificate for the domain.
6. Add the following lines to /etc/nginx/sites-available/default:

location ~ "^/(5[\d]{3})/(.*)$" {
   proxy_pass http://0.0.0.0:$1/$2$is_args$args;
}

6. ~/blockchain/bash/bcstartn %number_of_nodes%, where %number_of_nodes% should be replaced by a number no bigger than the number of rows in input/node_ids.csv

Architecture

References

Learn Blockchains by Building One

https://hackernoon.com/learn-blockchains-by-building-one-117428612f46

Learn Blockchains using Spreadsheets

https://medium.com/@vanflymen/learn-blockchains-using-spreadsheets-b97ad92b9b4d

How do peer-to-peer programs discover each other?

https://jameshfisher.com/2017/08/11/peer-to-peer-discovery/

Nested tables from json

http://bl.ocks.org/nautat/4085017

Read lines from a file into a Bash array

https://stackoverflow.com/questions/11393817/read-lines-from-a-file-into-a-bash-array

How to split a string into an array in Bash?

https://stackoverflow.com/questions/10586153/how-to-split-a-string-into-an-array-in-bash