Gibscard

Gibscard is a protocol that enables on-chain gift cards. The global gift card market is currently worth $899.3 billion and is expected to grow to $2.3 trillion by 2030 (*1). We believe that this market can be brought into the web3 world by utilizing the latest advancements in the crypto space, such as Account Abstraction and Zero-Knowledge proofs.

The gift cards usually are used by the average consumer who does not have good technical expertise to use crypto wallets. Because of that, we hide all the complexity under a social login, giving the user a web2 experience while being on-chain.

When a user receives a gift card through our system, they can log in using their email address, and we will create an AA wallet for them. They can then select a product on our website and click on the "Buy" button. On our backend, we will verify the ZK proof to ensure that the user has the right to claim the gift card. We will then convert tokens from USDC to the ticker used on the product they have chosen to buy. Lastly, we will send a gas-less transaction on-chain that executes the Withdraw-Swap-Buy process without the user even noticing all the infrastructure and blockchain layers.

This protocol provides a great advantage for businesses as it enables them to effortlessly release their NFT products into the market and make them available through gift cards. Businesses can earn fees by stacking the gift cards' value until they are claimed or by setting an expiration date on them, which will result in distributing the unclaimed cards to the business owners.

Source:

• (*1)

Deployed smart contracts

• Sepolia
• Polygon
• Base
• Arbitrum

Circuits

To run cicuits, go inside the apps/circuits folder:

cd apps/circuits

Install dependencies

yarn install

Compile circuits and generate and verify the zk-proof using snarkjs

To know how is everything generated, you can see the executeGroth16.sh file inside the gibscards folder.

To compile and run the circuit, go inside the sudoku folder and run:

Run the first time:

chmod u+x executeGroth16.sh

And after that, you can always run:

./executeGroth16.sh

Run tests

yarn test

Contracts

To run contracts, go inside the apps/contracts folder:

cd apps/contracts

There are two smart contracts:

• Gibscards.sol: withdraw and deposit logic.
• gibscardsVerifier.sol: to verify the zk proof (this contract was generated using snarkjs).

Install dependencies

yarn install

Deploy

Create a .env file and add to it:

PRIVATE_KEY=<yourPrivateKey>
ALICE_PK=<testingPK>
BOB_PK=<testingPK>

where yourPrivateKey is the private key of your wallet to use for contratct deployment.

To deploy on Sepolia run:

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

Deploy config also supports base, mumbai and arbitrum networks.

Run

To make a transactions with Alice and Bob PK using deployed contracts run:

npx hardhat run scripts/run.js --network sepolia

Frontend

Install dependencies

pnpm i

Local development

pnpm dev

Deploy

Fill all the secrets in the .dev.vars file and run:

pnpm run build && pnpm run deploy