Reviewing deployed contracts? Tough! Even tougher in a multi-chain world. Based on our Operational Security experience at MakerDAO, we bring you On-Chain Review: a code viewer that visualizes deployed contracts across chains with trusted attestations from colleagues and auditors.

Ethereum Attestation Service
Also appeared as EAS
Prizes on Devfolio and ETHGlobal
EAS is an infrastructure public good for making attestations onchain or offchain about anything. Attestations are digital signatures on structured pieces of data used to build more trust. The protocol is open-source, permissionless, and token-free. Attestations are a simple yet powerful primitive that can be used in many use cases and we're excited to see what you build! Learn more at https://docs.attest.org. Did you know? - 1M+ attestations have been made in the Superchain from large ecosystem builders like Gitcoin, Coinbase, Optimism Foundation, and others. - EAS is natively integrated into the OP Stack linked by two predeploy addresses? Look for predeploy addresses 0x420...021 & 0x420...020 on Base & Optimism. Dev Tools - SDK: https://github.com/ethereum-attestation-service/eas-sdk - API - https://docs.attest.org/docs/developer-tools/api - Optimism Explorer - https://optimism.easscan.org - Base Explorer - https://base.easscan.org
- Prize money awarded
- $40,000
- Prizes
- 29
- Winning projects
- 28
- Hackathons
- 6
- Largest prize
- $4,000
- Active
- 2023–2024
What they reward
Tech their winners favour
Share of Ethereum Attestation Service's winners using it, against all entries at the same hackathons.
Recurring prizes
Tracks offered at more than one hackathon.
- Ethereum Attestation Service2 hackathons · about $5,000 · last 2023
Hackathons
- ETHIndia 2024 Dec 6–8, 2024$5K–5$5K
- Superhack 2024 Aug 2–16, 2024$10KGold6$10K
- Istanbul Nov 17–19, 2023$5KProvider4$5K
- Superhack Aug 4–18, 2023$5K–5$5K
- Paris Jul 21–23, 2023$10KPillar4$10K
- Waterloo Jun 23–25, 2023$5KProvider4$5K
Winners
All 28 winning projects →RepoRewards is a cool blockchain-based platform designed to make rewarding open-source contributions on GitHub super easy and transparent.
DeDe is a trustless scaling infrastructure for e-commerce & delivery platforms. Think of us as an L2 for deliveries like Amazon, DHL, FedEx, etc. We provide trustless deliveries while maintaining integrity and security.
Pulse is a mobile-first social app that improves your feed based on your social graph and in-app interactions. Powered by a dynamic recommendation engine, your content is in perfect sync.
Developer tool for custom attestation schemas. Built on OP Stack for fast transactions, secured by Eigen DA, and leverages Worldcoin ID for user verification. Manage, monitor, and analyze attestations efficiently.
MedX leverages blockchain to secure medical records and streamline prescription processes, ensuring privacy and efficiency in healthcare management.
0xSybil - Zero x'ing the sybil attacks, save the protocol democracy!
SquirrelPay is an on-chain, privacy-preserving payroll solution that uses attestations to prove legitimacy of funds
Safeguard your blockchain experience! Trust Explorer: a contract scoring system with Ethereum attestation & worldID verification for secure reviews. Say no to untrustworthy contracts. 🛡️
Manage your your keys, attestations, ZK identities & proofs.
Document signer with identity verifiability through WorldCoin proofs and attestations (EAS)
Fair Play Verified, Bots Nullified.












