onchain logic
Linea Sepolia smart contract
kernel
a Solidity contract deployed to Linea Sepolia via MetaMask private key, then verified on LineaScan
how it drives the UI
a 'verified onchain' badge with the live contract address and a LineaScan link
Four onchain primitives, demystified.
Every idea in this repo leans on one of four web3 primitives. Each one runs against Linea Sepolia (a free, real Ethereum L2 testnet where gas is effectively zero) so you can ship a verifiable demo with zero hosting.
The five secrets
Add these in your Lovable project (Settings → Secrets) before pasting any mega-prompt:
- METAMASK_PRIVATE_KEYExported from MetaMask. Fund on Linea Sepolia via the official faucet.open ↗
- ETHERSCAN_API_KEYLineaScan is on Etherscan Multichain — same key verifies Linea Sepolia.open ↗
- PRIVY_APP_IDGoogle sign-in with an embedded Linea Sepolia wallet.open ↗
- PINATA_JWTPin to IPFS.open ↗
- LINEA_SEPOLIA_RPC_URLRecommended. A public Linea Sepolia RPC is used if omitted, but Alchemy is required for reliable event reads.
250 ideas use this
decentralized storage
IPFS via Pinata
kernel
a Pinata JWT upload that pins images / JSON / manifests to IPFS and returns a permanent CID
how it drives the UI
a 'pinned to IPFS' chip with the CID and an ipfs.io gateway preview
wallet UX
Privy social login
kernel
Privy embedded wallet bootstrapped with PRIVY_APP_ID — Google sign-in with a Linea Sepolia embedded wallet auto-provisioned for every user
how it drives the UI
a one-click 'Sign in with Google' that drops the user straight into the app with an onchain identity
onchain authorship
NFT provenance mint
kernel
an ERC-721 contract on Linea Sepolia that mints a creator-owned token pointing at an IPFS CID, verified on LineaScan
how it drives the UI
a 'mint to claim authorship' button that returns the tokenId, owner address, and LineaScan link