Mine your own grades

Gradecoin is the latest cutting edge blockchain technology agile grading framework that drives organic engagement and other buzzwords, with big data mining search engine optimization (now supporting NFTs)

⇩ Learn How ⇩

Welcome to Gradecoin!

Blockchains are incredibly simple yet can appear very complicated, we will see how they work and practice programming production cryptography code.

This server is the sandbox for the PA1, it's currently running the Gradecoin application. Gradecoin is the faux currency we will use to simulate a blockchain network. At the end of the simulation, the amount of Gradecoin you hold will be your PA1 grade.

A quick summary: authenticate yourself to the system using public key encryption. Craft Transaction proposals and tag them using JWTs. When there are enough transactions then you can propose Blocks in the same way. Blocks need to be mined beforehand using Proof-of-work, or brute force.

Gradecoin offers 3 endpoints at /register, /block and /transaction. You can only send GET requests to /block and /transaction without authorization. The server is programmed in RESTful architecture, there are no DELETE, PUT or UPDATE operations, though.

Gradecoin uses a Proof-of-work block accepting mechanism. It uses single round Blake2s hashing which produces 256-bit (64 hexadecimal characters) output. The target hash is 24 bits or 6 hexadecimal characters of 0.

We're expecting you to use existing tools and implementations. Standards are hard. Don't roll your own crypto. Feel free to ask questions. Collaborate.

You might ask,

But if nobody has any Gradecoin then how do we have transactions?

You get rewarded for your hard work during the authentication with some Gradecoin to start with! Then you can earn block rewards by proposing blocks, create some Gradecoins by generating traffic on the system, or transact with our new highly trained AI bots!


The first transactions of a block is called the coinbase. They are the author of the block proposal and if the block is accepted then they get compensated for their efforts with some Gradecoin.

Public Key Signatures

Gradecoin uses 2048 bit RSA keypairs.


Please respect the system and others. Keep your request rate below a reasonable limit. Programming a bot is absolutely fine as long as it's not aggressively sending requests.




Authorization: The request header should have Bearer JWT.Token signed with Student Public Key



This all sound complicated!

How do you actually earn Gradecoin?

I found a bug!

Thank you! Please let me know so we can solve it.

I hacked the server!

That wasn't supposed to happen :( I did not place any intentional vulnerabilities to the system so if you cracked something, it was not intended. Please don't abuse it and let me know so I can patch it.


At the end of the simulation, your Gradecoin balance will be your grade. I will also expect a unique client programmed in either;

If your favourite programming language is missing please let me know 🤷?

Can my friends play?

Probably not at this point. I've allowed a couple of people during the testnet phase but don't intend to any more.

How and or Why?