Announcing the Cross-Chain Hackathon Winners

The Cross-Chain Hackathon, hosted by Gitcoin, started as a way to involve developers from around the world and give them ample time to work on their projects. After months of planning and almost one month of hacking, we’re excited to say we received over 20 total submissions! Let’s go over the winners.

Cosmos Challenge Winners ($15,000 total in ATOMs)

With the Cosmos challenge, we wanted to see what developers can build with the Cosmos toolkit. This includes the Cosmos SDK, IBC, Ethermint, Peggy, and CosmWasm. Here are the winners:

1st place — MeiChain ($6000 in ATOMs)

1. MeiChain is the MEI stablecoin system with a collateral debt position (CDP). There’s three blockchains working together. The Cosmos Hub users hold their ATOMs and use them as collateral for minting MEI. Next, Meichain is used to store the CDP and the MEI token itself. Lastly there’s Bandchain, which serves the ATOM/USD price feed from several exchanges to Meichain. All chains communicate to MeiChain by sending packets across the chain using IBC relayers. (view Github)

2nd place — LikeCoin ISCN ($5000 in ATOMs)

1. LikeCoin is a public blockchain for content monetization, attribution, and distribution. For this hackathon, they provided two components. 1) A Cosmos SDK module for users to record content metadata according to the ISCN specification and 2) IPFS plugins for querying and parsing this content metadata from the chain. (view Github)

3rd place — Qonico ($4000 in ATOMs)

1. Qonico is a Cosmos blockchain implementation for small IOT devices. It includes a guide, a cross-chain client using RaspberryPi, a web client and a js client. (view Github)

Agoric Winners

Agoric’s winners made good use of its platform for building reusable smart contracts. They were:

Grand Prize ($1000 in ATOMs)

1. KryhaDapp — addressed the problem of plastics recyclers not knowing what kind of plastic was used to make bottles and if it was recyclable. Their solution provides a single shared source of truth for tracking product lifecycles. To do this, they used multiple reusable and cooperating contracts (five in all), with a useful UI. (View Github)

Winners ($500 each in ATOMs)

1. Time Release — a contract that transfers funds, but only after a specified amount of time has passed. It was notable for being a useful and interesting reusable component with test automation. (View Github)
2. Bonsai Exchange — a fun sales application where users buy bonsais and plant them. It reused an existing component, wired it into a new UI, and interacted with Agoric’s wallet implementation. (View Github)

Honorable Mention ($250 each in ATOMs)

1. Goodwill — a merger of a modified Agoric encouragement dapp with the ultimatum game, a standard economics experiment to measure trust. One person makes an offer on how to divide assets, and another accepts or rejects. Acceptance means the assets are divided per the offer, rejection means both parties get nothing. This project was a start at making re-usable components for quickly building experiments. (View Github)
2. Ice Cave — while incomplete, it made good progress towards integrating Agoric smart contracts with the Phaser gaming framework. The result is a decentralized game with non-fungible loot boxes on top of the Agoric blockchain. (View Github)

Band Protocol Winners

Several teams provided submissions for Band’s DeFi category for the Cross-Chain Hackathon. Here are the winners:

Winners (2000 BAND each)

1. MeiChain — The MEI stablecoin system with a collateral debt position (CDP). Uses the Cosmos Hub, MeiChain, and Band’s price oracles. (View Github)
2. CoinPriceBet — A prediction market built on the Cosmos SDK which has a frontend demo and sources crypto prices from Band’s oracles using IBC. (View Github)

Honorable Mentions (500 BAND each)

1. StakeSafe — an interface for staking any supported liquidity pools safely, with pool information coming from Band’s price oracles. (View Github)
2. SEMA — allows users to buy second-hand items with the ATOM token by posting items, accepting the transaction, sending tokens, and exchanging tokens. (View Github)

Notable Teams

For the Cosmos challenge, several exceptional teams that provided submissions that we didn’t cover above. Each of these teams is eligible for a Cosmos T-shirt. These include:

1. Map of Zones — a visualizer that displays a galaxy of the interconnected networks built on the Cosmos SDK with the IBC module. (View Github)
2. AstroCanvas — a game and radical experimentation in stake decentralization. Inspired by the 2017 Reddit April Fools project r/Place, AstroCanvas takes this one step further and applies it to solving staking centralization of proof-of-stake blockchains. Delegators are given specific colorToken that represents the right to change one pixel in the canvas when they delegate their staking token to a Hub validator. The catch? Not all colorToken are the same. Delegators can earn colorToken of a specific color (white, black, red, etc) depending on the voting power of the delegated validator. So for example, validator with #1 to #10 rank in voting power gives delegators colorTokenWhite which only allows you to place a white pixel on the canvas. If you want to place a blue pixel, you need colorTokenBlue which you may only receive when you delegate to a validator with voting power ranging from #80 to #90. (View Github)
3. OpenMarket — provides a decentralized marketplace for non-fungible tokens (NFT) trading over IBC. It’s part of the Сosmos ecosystem and can be used to trade the non-fungible asset of any blockchain in it. This is done using the IBC protocol which, among other things, allows cryptocurrency and NFTs to be transferred between blockchains. (View Github)
4. Real Estate Exchange — a real estate trade application built on Cosmos SDK. Users have tokens and they can exchange real estate as securities. Each issuer pays dividends as another blockchain’s token to the security owners. The trade is empowered by the Cross framework, which supports a cross-chain atomic swap between blockchains connected via IBC. (View Github)
5. CoinPriceBet — A prediction market built on the Cosmos SDK which has a frontend demo and sources crypto prices from Band’s oracles using IBC. (View Github)
6. SEMA — allows users to buy second-hand items with the ATOM token by posting items, accepting the transaction, sending tokens, and exchanging tokens. (View Github)
7. Cross Chain Crawler — uses Web of Trust and Google NL APIs to rate as many sites and services on various blockchains. (View Github)

Conclusion

Thank you to everyone from Gitcoin, Agoric, Band, Interchain GmbH, Tendermint Inc, and the Interchain Foundation for helping to make this virtual hackathon a reality. We’ll be reaching out to the winners of the Cross-Chain Hackathon soon regarding KYC and tax documents along with those eligble for t-shirts. Again, thank you to all who participated!

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The views and details expressed in this blog post are those of All In Bits Inc (dba Tendermint Inc), and do not necessarily represent the opinions or actions of the Interchain Foundation.