magicprivatecollector

We are enabling users to create NFTs with private content. This private content can only be accessed by the owner(s) of the NFT. We are accomplishing this by:

A user buys an NFT with private content. The NFT is then transferred to her wallet.
Whenever she wants to see the private content, she needs to log into Metamask and sign a transaction. This transaction is calling a function in our smart contract called showPrivateContent(tokenId)
The smart contract verifies that this NFT is still owned by this address and sends back true or false.
The frontend receives the transaction hash and the information if the address still owns the NFT. It then waits until the transaction is confirmed on the blockchain.
It then sends a request to our backend with the transaction hash, tokenId and address. The backend verifies individually that this transaction has been made, was successful, is valid and has been performed in a timely manner (seconds ago). It then sends the private content and one time private content url to the frontend. This content is now visible in the current frontend session. Once the frontend session is destroyed, the content is gone. The post request can only be used once. The backend keeps track of expired transaction hashes in order to prevent from delivering the content multiple times (this might not be necessary, because the timestamp might be enough for this).

Configure image upload

Make sure to create this file on your local: .env.local and put these variables in: S3_UPLOAD_KEY=AAAAAAAAAAAAAAAAAAAA S3_UPLOAD_SECRET=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA S3_UPLOAD_BUCKET=name-of-s3-bucket S3_UPLOAD_REGION=bucket-region-us-east-1

Configure Quicknode

QUICKNODE_PROVIDER= QUICKNODE_APIKEY=

Smart contract folders

We would prefer to move all the smart contract development files to it's own repository but for this hackathon we will keep it all in here. This is a list of folders and files used for smart contract and should be ignored by frontend: artifacts cache contracts scripts hardhat.config.js

Node modules for smart contract development: @openzeppelin/contracts hardhat @nomiclabs/hardhat-ethers

Setup smart contract development

Make sure hardhat is installed:

$ npx hardhat

Then run a local node

$npx hardhat node

Compile smart contract

Make sure hardhat node is running!

npx hardhat compile
npx hardhat run --network localhost scripts/deploy.js

Make sure to add the config in hardhat.config.js!!

npx hardhat run --network polygonTestnet scripts/deploy.js