CHENG, KANG^[1]

Projects I’ve made and kept returning to, shared through the notes, images, and details that matter to each one.

3 groups · 29 files

Album

5 groups · 134 files

Drawing

6 projects

Projects

36 files

Writing

Projects I’ve made and kept returning to, shared through the notes, images, and details that matter to each one.

2020–2022Link — The ACNH CommunityA two-day turnip price tracker that grew into Link, an ACNH community used by 100k+ people across 143 countries.Animal CrossingReact NativeFirebaseCommunityWeb & iOS & Android
zkSync Best Application — HackMoney 20222022ENS Layer 2 Support for zkSyncThe first ENS L2 support showcase with zkSync—record updates had roughly 130× lower gas fees and confirmed faster than on L1.EthereumEIP-3668zkSyncENSSolidity
Follow
peeps online pps.eth
@peepsonl_reborn
Online is the new real life! Mint yourself, own yourself — governed by no one.
and many more peeps
Pool prizes — ETHOnline 20222022peeps onlineA Web3 identity world my friends and I imagined around a growing cast of characters—and where I first became 3n4.Web3NFTSocial IdentityCharacter DesignENS
2022–presentDOUA collection of pictures I made from moments in our life that I wanted to remember.3D PrintingCharacter DesigniPad DrawingPixel Art
NFT #34peeps online
RANK #2
do you remember being minted?
2:24 am. that’s when i answered the summoning.
my people are still in the mempool. i’m going back for them.
Message NFT #34…
2023talktonft.aiAn AI experiment that let anyone chat with a public NFT, with a roadmap for creators, owners, and communities to shape its character and world.AI CharactersLangChainVector SearchNFT MetadataCommunity
1 / 144 / 1410 / 1413 / 1414 / 14
2025It's ALL GOOD.An ongoing project to shape a delightful perspective of my own, starting with a selection from designer brands I love.CurationCreative DirectionBrandDesign

zkSync Best Application — HackMoney 2022

2022

ENS Layer 2 Support for zkSync

The first ENS L2 support showcase with zkSync—record updates had roughly 130× lower gas fees and confirmed faster than on L1.

Ethereum
EIP-3668
zkSync
ENS
Solidity

Together with 7cc.

We were looking for ideas for HackMoney 2022. I had recently read about EIP-3668 and thought ENS on L2 would be worth trying. It also fit what we were doing with peeps online.

This was my first deep dive into smart contracts. I got hands-on with Ethereum and zkSync contracts, and started getting familiar with L2s, zero knowledge, gateways, and decentralized storage.

How it worked

The implementation had three parts: an L1 resolver on Ethereum, a Node.js gateway running on GCP, and two contracts on zkSync. L2ENSRegistry held ownership, resolver settings, and permissions. L2PublicResolver held records such as addresses, text, and content hashes. Updates were written directly to those L2 contracts, which was where the lower fees and faster transactions came from.

EIP-3668 handled the read path. When a wallet queried the L1 resolver, it received an OffchainLookup instruction. The wallet called the gateway, which read the record from zkSync and signed the response. The wallet then sent that response to resolveWithProof on Ethereum, where the contract checked the authorized signer and expiry before returning the record.

One lookup · 3n4.pps.eth

The EIP-3668 round trip used by the project: read from zkSync, sign at the gateway, and check the authorized signer on L1.

Outcome

We directly measured roughly 130× lower gas fees for updating records on zkSync than on L1, and the transactions confirmed faster too. The project won the zkSync Best Application prize at HackMoney 2022. The resolver was then used by peeps online.

Links