FlashCard is blockchain based app for flash card payment like (Gift Cards) which can be redeemed later with a key and card Id.

Note: This is very basic implementation of my idea or in other words its the first concept draft. Will keep improving and adding feature. End goal is to develop a flashcard payment service to pay on-chain without any wallet. Feel free to contribute or suggest any changes.

How it works:

• User creates a card with any amount (in ETH) using createNewCard() with parameters amount and keyHash (keccak256) of the password user wanna use.
• The above step generates and returns a cardId for the card generated.
• Card can be redeemed either partially or fully to anyone.
• Partial redemption requires a keyHash swap meaning it will replace the key for next redemption.
• User can either redeem the card to same wallet or to other wallet address using redeemCard() or redeemCardTo() function respectively.

Future integrations:

• Migrate to EIP-2535 for better storage layout and upgradability
• Card based attribute layout to add custom features
• Different type of cards like only full redeemable or locked till timestamp +more
• Password/Key can be changed on demand
• A card will have a whitelist and a blacklist maintained by original owner
• An official frontend
• (MAYBE) NFT Cards
• (MAYBEE) More currency support
• (MAYBEEE) Governance for Cards (admin control)

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Hardhat Tasks Commands

Try running some of the following tasks:

npx hardhat help
npx hardhat test
REPORT_GAS=true npx hardhat test
npx hardhat node
npx hardhat run scripts/deploy.ts