Udacity Blockchain Capstone

The capstone will build upon the knowledge you have gained in the course in order to build a decentralized housing product.

Showcase

For the Capstone project, it was important to also share a deployed version of the contracts and perform some sale operations via Opensea. Please find all relevant information below.

Contracts

NFT (Rinkeby)
Verifier (Rinkeby)
Abi's

Opensea Storefront

Udacity BlockchainDeveloper Capstone RC

Opensea Sale Transactions

0xf7aa0f4b2a8a6619dc4cd57414a8d5476c823b0768c6f021de0f7ec3c62b624b
0xa00587c293c4732d123d325d81116e887db4ad0960926ad699c32a3f21da16b7
0x780ac6ab075c2eb953d0cd506cb1fc5a6f59c5560dc9bd632501b8029ea2fcb0
0x1e4a23ed386216fb9440be475e6343d75659ed22fb0d02ff645f01af0124c187
0x6d2ed7b4e9ebf57ccdca260c3c457f7eda189826aebcb941cb0c5072dd5d6835

Prerequisites

Before you start, make sure the following tools are installed on your systen.

Setup an Account for testing

Additionally, make sure to setup an account for Infura and create a project to retrieve your Infura Key needed to connect to the Rinkeby network.

Setup

Generate a snSNARK proof

Run the zkSNARK docker image (old image because of the old solidity version used in this project)

docker run -ti -v $(pwd)/zokrates:/udacity zokrates/zokrates:0.5.0 /bin/bash

Within the docker image, navigate to the code directory

cd /udacity/code/square

Compile the code

~/zokrates -i square.code

Run Setup

~/zokrates setup

Compute Witness

~/zokrates compute-witness -a 3 9

Generate Proof

~/zokrates generate-proof

Export Verifier code

~/zokrates export-verifier

On your host, copy the verifier.sol into your contracts folder.

cp zokrates/code/square/verifier.sol eth-contracts/contracts/Verifier.sol

Start Ganache

Feel free to use the ./01_start_ganache_cli.sh. The containing wallet recivery mnemonic is for testing only and should never be used to store any actual value.

Test

Test the code by running truffle test within the eth-contracts/ folder.

Deploy

Ensure you have configured your .env file according to the .env.sample provided in the eth-contracts/ folder.

Local
truffle migrate

Rinkeby
Ensure you have your environment variables set as described above. truffle migrate --network rinkeby

Mint NFTs

For simplicity, a script has been created to deploy 10 new NFTs per execution. The token id's start at the current totalSupply() + 1.

From within the eth-contracts/ folder, run the script as follows:

Local
truffle exec scripts/mint.js

Rinkeby
truffle exec scripts/mint.js --network rinkeby

ReneVolution/Udacity-Blockchain-Capstone