Issues tickets that can’t be faked and resell only at fair prices
Intermediate36h2–3
SolidityOpenZeppelinviem
15/20Web3 ideas
Smart contracts with a real-world job
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Beginner 13Intermediate 24Advanced 9
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Explains a wallet’s transactions in plain English
Beginner12h1–2Next.jsviemLLM15/20Summarizes long governance proposals before a vote
Beginner12h1–2Next.jsLLM15/20Explains static-analysis findings in plain language with fixes
Advanced36h2–3PythonSlitherLLM15/20Holds payment in escrow and releases it per approved milestone
Intermediate36h2–3SolidityFoundryviem15/20Gives attendees a verifiable badge for each event
Intermediate24h1–3SolidityOpenZeppelinNext.js14/20Lets new users act on-chain with just an email-style login and no gas
Advanced48h2–4SolidityAccount abstractionviem15/20Shows donors exactly where each donation was spent
Intermediate24h2–3SolidityviemNext.js15/20Issue certificates anyone can verify onchain without calling the school
Intermediate14h1–2EAS attestViemNext.js17/20Run a rotating savings circle with transparent rules in a smart contract
Advanced26h2–3SolidityFoundryWagmi17/20Show members-only content to wallets that hold a pass
Beginner8h1–2WagmiViemNext.js16/20Show signers what a pending multisig transaction will really do
Intermediate16h1–2ViemNext.jsLLM17/20See exactly which tokens leave your wallet before you sign
Advanced24h2–3FoundryViemNext.js17/20Publish a portfolio that lives on IPFS and cannot be taken down
Beginner8h1HeliaIPFSHTML15/20Reviews that count only from verified unique buyers
Advanced24h2–3EAS attestSolidityNext.js16/20Run transparent elections where each member votes once
Beginner10h1–2SolidityScaffold-ETHNext.js17/20Backers get automatic refunds if the goal is not reached
Intermediate16h1–2SolidityFoundryWagmi17/20Pay subscriptions in stablecoins without signing every month
Advanced28h2–3Account AbstractionSolidityViem15/20Scan a bag and see the farm, harvest and fair price paid
Intermediate18h2–3EAS attestNext.jsQR codes17/20Know the cheapest time to send a non-urgent transaction
Beginner8h1ViemEChartsNext.js16/20Find and revoke old unlimited token approvals
Intermediate12h1–2ViemWagmiNext.js17/20Explain what an off-chain signature request actually allows
Intermediate12h1ViemLLMNext.js17/20Prove a carbon credit was retired once and only once
Intermediate16h2–3SolidityOpenZeppelinNext.js17/20Prove a document existed at a time without revealing its content
Beginner8h1ViemWeb CryptoNext.js17/20