zkPages

zkPages enables any user to create their own digital content store managed by smart contracts.

Going after the Consumer and Privacy categories for StarkHack 2024.

Live Demo url: https://zkpages.vercel.app (Starknet Sepolia testnet)

Demo video (youtube ~4 minutes): https://youtu.be/HO9kQjtSUjE

Motivation

Many platforms for building digital content stores exist, but many of them have drawbacks (ex: Gumroad). In particular, those that are based on web2 technologies often require large engineering teams and centralized services for mediation. There's often limitated

We wanted to see if we could use Starknet to solve this prolem. With ZkPages, any consumer can create a self-governing digital content checkout page that enables digital content sales without having to agree to high transaction fees on every sale. Additionally, Starknet has intrinsic benefits as a secure ledger for managing receipts and smart contract execution for processing transactions and redirects for purchases.

Features

• [x] Single page store front managed by Starknet smart contracts
• [x] Every store has it's own audit history
• [x] Zero knowledge checkout
• [x] Trace-free payments
• [x] Off-platform content support via custom post-purchase links

How it works

ZkPages allows users to create single-page digital content storefronts powered by Starknet smart contracts. The platform emphasizes privacy and security through zero-knowledge checkouts and trace-free payments. Users can easily manage their store, upload content, and track their audit history, ensuring transparency and accountability.

1. Create a Stark account: Start by creating an account on the Starknet network to get access to the zkPages platform.
2. Create a zkPages store: Use the zkPages interface to set up your digital content store. Each store is represented as a single-page storefront.
3. Add digital content: Upload your digital content as items to the store. Content for the purchases can be delivered through custom web2/authenticated links or addressed content through IPFS.
4. Share your store front URL online: Promote your store by sharing the unique URL with your audience.

How it's made

zkPages is built on top of the Starknet blockchain, utilizing its scalability and security features. The platform employs zero-knowledge proofs to ensure that checkouts are private and secure without exposing unnecessary information. Content is stored and delivered via IPFS, a decentralized storage network that ensures that digital assets are distributed efficiently and reliably. The frontend is designed to be user-friendly, allowing anyone to set up a store with minimal technical knowledge.

When a user accesses a deployed zkPage, he/she has the ability to initiate a private checkout. Upon completion, a contract event gets saved to the zkPage smart contract and the user is redirected to the purchase success url where he/she can access the content. Any guards or security around access (ex: sharing the link with others) should be baked into the url itself, ZkPages does not control or apply any access guards to the url currently otherwise.

Note this app is currently a prototype deployed on the Starknet Sepolia testnet and would require additional work to be production-ready.

Example deployed store

App-hosted page: https://zkpages.vercel.app/pid/0x6171e50d9a19e57699ba2a21e79743f3244bff65bbbe3d06906a304e6b16971 Contract on explorer: https://sepolia.starkscan.co/contract/0x06171e50d9a19e57699ba2a21e79743f3244bff65bbbe3d06906a304e6b16971

Technologies used

Starknet: Core blockchain infrastructure, providing a scalable and secure environment for managing smart contracts and transactions. Starknet is a key component of zkPages, offering a robust foundation for the platform's blockchain operations. Its scalability ensures that zkPages can handle a high volume of transactions without compromising speed or efficiency. The security features of Starknet protect both the store owners and customers, maintaining the integrity of transactions and smart contracts. By leveraging Starknet's zero-knowledge proof technology, zkPages enables privacy-focused checkouts, ensuring that sensitive information remains confidential while verifying the validity of transactions. L2 is also uniquely advantageous to the app to enable checkouts that have permanent receipts as blockchain transactions at low cost.

Dynamic.xyz: Dynamic.xyz provides the authentication framework for zkPages, ensuring that only authorized users can access and manage their storefronts. This integration streamlines the user onboarding process, offering a secure and user-friendly way to log in and interact with the platform. Dynamic.xyz supports various authentication methods, enhancing the security and flexibility of the zkPages platform. Dynamic could be used in the future to easily extend the platform to work on other networks for doing simple checkout pages without significant changes to the code.

Voyager API: Integrated for in-app contract interactions and viewing transaction history, providing users with transparency and auditability of their store's activities. By providing detailed insights into contract interactions and transaction logs, Voyager promotes transparency and accountability within the zkPages ecosystem. Voyager APIs, in particular, enable in-app custom views of blockchain data as transaction receipts without having to leave the app to get information about the performance of the store or look up transactions from particular users on the network.

View more information and screenshots on the github here: https://github.com/cbonoz/stark24