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The ETHGlobal Tokyo Hackathon is over and the 11 finalists have been announced

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It covers wallet, NFT, DeFi, social, payment, security and many other fields.

Title: A Review of the 11 ETHGlobal Tokyo Hackathon Finalists

原文来源：星球日报 ODAILY

On April 16th, in Tokyo, Japan. ETHGlobal Tokyo The theme Hackathon is officially over.

Eleven finalists were selected for the Hackathon, covering areas such as wallet, NFT, DeFi, social, payment and security. These items will be shared jointly by ETHGlobal Associates 1inch, Taiko, Mina, Polygon, Lens And $375,000 from 36 projects. Here, Odaily Planet takes a look at the 11 finalists.

盘点 11 家 ETHGlobal Tokyo 黑客松决赛项目

ZKVoiceKey

Award-winning homepage: https://ethglobal.com/showcase/zkvoicekey-zeufj

ZKVoiceKey provides a new way to recover a wallet private key by voice.

Traditionally, private key recovery is limited by social recovery and device dependence. ZKVoiceKey's solution allows users to register their voice on the blockchain in advance, and then recover it using unique biometric information if the private key is lost.

ZKVoiceKey also uses Fuzzy Commit ZKP, thereby avoiding storing voice information directly on the blockchain, and instead allowing for authentication through fuzzy matching of voice.

BAILOUT

Award-winning homepage: https://ethglobal.com/showcase/bailout-ia 6 s 1

BAILOUT can be understood as a secure channel for multiple wallets, allowing users to safely move assets between EOAs, contract wallets, and cold wallets.

With the development of account abstraction, there are more and more contract wallets on the market, such as Argent, Safe, etc. However, such as Uniswap While Dapps do not support these direct connections to contract wallets for the time being, many individual investors will use regular EOA wallets to do most of their interactions and then store most of their assets in cold wallets or contract wallets.

Thanks to BAILOUT, users were able to transfer a certain amount of assets from the EOA Wallet to the contract wallet, and were able to sign transactions through the EOA Wallet, even in case of emergency. Google Signin signed the deal.

BAILOUT also supports the restoration of social function. If a user accidentally loses an EOA private key or device, it will allow the user to transfer all assets to a cold wallet with one click without paying any wallet gas fees. This makes day-to-day asset management smoother and safer, and minimizes losses caused by the loss of private keys.

AokiApp NFT

Award-winning homepage: https://ethglobal.com/showcase/aokiapp-nft-1 t 8 k 7

AokiApp NFT is a full-onchain. NFT collection, which introduces the new image compression technology of NFT, realizes the image decompression and operation on EVM.

Currently, most NFT projects rely on external servers (the better ones use IPFS) to store image files. If the server used to store the files itself has problems, the immutability and availability of the NFT itself will be affected. Although such things as Projects like Cryptopunks have experimented with storing uncompressed files directly on the blockchain, but this tends to require a lot of gas consumption.

AokiApp NFT is original in developing an image compression method based on "principal component analysis" (PCA) and applying its knowledge of linear algebra to create this complete chain NFT collection, all file contents are compressed and stored completely on the chain. The solution has the following main characteristics: simplicity, which can be implemented with short code that can be executed on the EVM; It is highly compatible with the current mainstream pfp class NFT mode. The more NFT issued, the whole collection The higher the compression ratio.

Octoplorer

Award-winning homepage: https://ethglobal.com/showcase/octoplorer-block-query-made-easy-pdgmt

Octoplorer is an AI-powered blockchain resource manager that aims to reduce the technical barriers to query blockchain data. With Octoplorer, users can enter natural language to query all kinds of data on the blockchain and get human-readable answers in tables, images and graphs.

In the natural language query function, Octoplorer Use OpenAI ChatGPT 3.5 'text-davinc-003 Model, which is enhanced by langchain library to further improve the intelligent effect.

Currently, Octoplorer's service works with Ethereum and Polygon.

Myna

Award-winning homepage: https://ethglobal.com/showcase/myna-uxzdd

Myna is a wallet solution for Japanese users that allows them to use their government-issued ID (My Number Card) as a hardware wallet, enabling a simple and secure cryptocurrency-hosting solution.

Myna can be used for each My Number Card Generate an EIP-4337-compliant contract wallet that abstracts away the wallet creation process for the user and supports features such as social recovery. This will enable Japanese residents to safely transfer ownership of their wallets in any emergency.

probablynothing.works

Award-winning homepage: https://ethglobal.com/showcase/probablynothing-works-qgrrf

Probablynoth.works is an agreement that allows the Web3 community to generate revenue from advertising. Advertising revenue is an important way to generate revenue in traditional online communities, but so far, for various reasons, the advertising business in the Web3 world has been slow to achieve effective development.

The vision of ProbablyNoth. works is to bridge the Web3 world of advertising services. The system designed for this agreement involves four roles, including publishers of advertising information, advertisers disseminating information, website visitors receiving information, and protocol operators providing the infrastructure between publishers and advertisers. Probablynothin.works hopes to use NFT to bridge the supply and demand between publishers and advertisers, with one side providing the information for a fee, and the other paying for a channel based on which communities they want their ads to reach.

AbswapX

Award-winning homepage: https://ethglobal.com/showcase/abswapx-jmefw

AbswapX can be understood as an automation module that enables limit orders and reservation policies for DeFi. Specifically, AbswapX can create an automated module for any contract wallet or EOA wallet to be able to create a limit order from any token on any source chain to another token on any target chain in the EVM.

The implementation path of AbswapX is:

1. When users create limit orders, they specify specific token pairs, price relationships, and number of transactions;

2. Limit order additions will then be added to the AbswapX order book. AbswapX leverages Gelato Network to create proxy tasks with invocation data as specified by the user.

3. When the price is about to reach the user's designation, Gelato Network automatically executes the transaction and then converts the user's token to the required token at the specified price.

AbswapX has been deployed on Gnosis Chain and Polygon Chain. For test nets, it has been deployed on Goerli, Mumbai, Polygon zkEVM, Linea, ScrollzK, Taiko and Mantle.

Tanuki

Award-winning homepage: https://ethglobal.com/showcase/tanuki-s 8 ew 9

Tanuki is a trust-free wallet activity scoring protocol that uses ZKP to untrusted read the history of activity on the chain to calculate the wallet's score.

Many protocols now need to score wallets that have interacted with each other for various reasons (such as airdrops), but current scoring methods are mostly off-chain and therefore centralized, less transparent, and require additional trust. To solve this problem, Tanuki chose to use the ZK coprocessor Axiom to read and summarize the history data on the chain in a untrusted manner, which enables each protocol to calculate related metrics fairly and transparently, facilitating untrusted interactions.

Tanuki provides infrastructure-specific code that can be seamlessly integrated into various protocols.

YORU

Award-winning homepage: https://ethglobal.com/showcase/yoru-4 si 1 p

According to YORU, a privacy-enabled social payment tool, there are two main challenges to social payments with cryptocurrencies. One is that anyone can track trading history. On-chain transactions are transparent and anyone can track wallet balances from the same address; Second, the user experience on Web3 is terrible, the addresses are complex and difficult to remember, and each transaction requires gas fees (especially the ETH required to withdraw certain assets from a new address). To solve these two challenges, YORU uses account abstractions and invisible addresses for token transfers.

In terms of privacy transmission, transactions made through YORU send tokens to a one-time, invisible address owned by the receiver and known only to the sender and receiver.

In terms of user experience, YORU supports DID And ENS With public key registration, a user can link his wallet account to his social media accounts, such as Gmail, Twitter, Line, etc. In addition, YORU makes use of the Paymaster in the account abstraction to sponsor the transaction, thereby avoiding the problem of the recipient needing to deposit ETH in a one-time invisible address beforehand (for the purpose of extracting gas from the accepted asset).

SuperPlay

Award-winning homepage: https://ethglobal.com/showcase/superplay-5 zr 28

SuperPlay is a user-friendly gaming platform with the following operation processes and features:

SuperPlay SuperPlay SuperPlay A contract wallet associated with its E-mail address is automatically created; Within this wallet, users own a small number of game items. 20 tokens to qualify to play the game for a certain period of time (e.g., one week); During this time, the user does not need to use any assets in the wallet, and the game project will advance the relevant gas; After the trial is over, users can choose to cancel or subscribe to the game; To continue the subscription, the user has the option to use a credit card to pay for the game subscription, which is automatically deducted from their contract wallet on a weekly basis.

SuperPlay has significantly lowered the barrier to entry for Web3 by offering a Web3 game trial experience that requires no purchase of assets (ERC 20 tokens for subscription games) and the payment of Gas fees.

POMPoarding

Award-winning homepage: https://ethglobal.com/showcase/pompoarding-yis 1 w

POMPoarding provides a simple Web3 community collaboration tool.

POMPoarding Allowing community members to assemble through simple questions and answers without prior knowledge of cryptocurrencies or wallets; In terms of community management, POMPoarding provides a dashboard that allows community leaders to easily manage members; POMPoarding also took advantage of Push Protocol and The Graph to manage messaging between communities; At the back end, POMPoarding makes use of. SAFE Create a multi-signature wallet for governance, financial management and other work.