primer · onchain

Four onchain primitives, demystified.

Every idea in this repo leans on one of four web3 primitives. Each one runs against the 0G Galileo testnet (a free, real EVM L1 with native storage + AI) so you can ship a verifiable demo with zero hosting cost. Users sign in with Google via Privy, then top up their embedded wallet from the 0G faucet (0.1 OG/day) to pay testnet gas.

The three secrets

Add these in your Lovable project (Settings → Secrets) before pasting any mega-prompt. 0G's public RPC (https://evmrpc-testnet.0g.ai) is hardcoded — no RPC key needed.

METAMASK_PRIVATE_KEYExported from MetaMask. Fund on 0G Galileo via the faucet.open ↗
PRIVY_APP_IDGoogle sign-in + embedded wallet on 0G Galileo. User signs every tx and pays gas in OG (faucet: 0.1 OG/day).open ↗
LOVABLE_API_KEYAuto-provisioned by Lovable for AI calls via Lovable AI Gateway. Nothing to paste. Default model: google/gemini-3-flash-preview.open ↗

onchain logic

0G Galileo smart contract

250 ideas use this

kernel

a Solidity contract deployed to 0G Galileo testnet (chainId 16602) via MetaMask private key, then verified on 0G Chainscan

how it drives the UI

a 'verified onchain' badge with the live contract address and a 0G Chainscan link

EXAMPLE IDEAS

decentralized storage

0G Storage pin

247 ideas use this

kernel

an upload through the 0G Storage SDK that returns a permanent root-hash CID, signed by the user's wallet

how it drives the UI

a 'pinned to 0G Storage' chip with the root hash and a Storagescan-Galileo preview

EXAMPLE IDEAS

onchain authorship

INFT provenance mint

250 ideas use this

kernel

an ERC-721 / ERC-7857 contract on 0G Galileo that mints a creator-owned token pointing at a 0G Storage root hash

how it drives the UI

a 'mint to claim authorship' button that returns the tokenId, owner address, and 0G Chainscan link

EXAMPLE IDEAS

Four onchain primitives, demystified.

The three secrets

0G Galileo smart contract

0G Storage pin

Privy social + sponsored tx

INFT provenance mint