On April 16, the ETHGlobal Tokyo theme hackathon held in Tokyo, Japan officially ended.

Winning homepage:

ZKVoiceKey

Winning homepage:https://ethglobal.com/showcase/zkvoicekey-zeufj

ZKVoiceKey provides a new way to recover wallet private keys through voice.

Traditionally, the recovery of private keys is limited by social recovery and device dependence, while ZKVoiceKey's solution allows users to register their voices on the blockchain in advance, and then pass unique biometrics in the event of private key loss. information for recovery.

Winning homepage:

BAILOUT

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

BAILOUT can be understood as a secure channel that supports multiple types of wallets, allowing users to safely move assets between EOA, contract wallets, and cold wallets.

With the development of the abstract concept of accounts, more and more contract wallets have appeared on the market, such as Argent, Safe and so on. However, Dapps such as Uniswap still do not support these direct connections with contract wallets, so many individual investors usually use regular EOA wallets for various interactions, and then store most assets in cold wallets or contract wallets.

Through BAILOUT, users can easily transfer a certain amount of assets from the EOA wallet to the contract wallet, and can sign the transaction through the EOA wallet, and even support Google Signin to sign the transaction in an emergency.

Winning homepage:

AokiApp NFT

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

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

At present, most NFT projects rely on external servers (in better cases, IPFS will be used) to store image files. If there is a problem with the server used to store files, the invariance and availability of NFT itself will also be affected. While projects such as Cryptopunks have attempted to store uncompressed files directly on the blockchain, this tends to be very gas intensive.

Winning homepage:

Octoplorer

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

Octoplorer is an AI-driven blockchain explorer whose main function is to lower the technical threshold for users to query blockchain data. Through Octoplorer, users can enter natural language to query various data on the blockchain, and obtain human-readable answers in formats such as tables, images, and graphs.

In terms of natural language query functions, Octoplorer uses the "text-davinci-003" model of OpenAI ChatGPT 3.5, which is enhanced by the langchain library to further improve the intelligence effect.

Winning homepage:

Myna

Winning homepage:https://ethglobal.com/showcase/myna-uxzdd

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

Winning homepage:

probablynothing.works

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

Probablynothing.works is a protocol that allows the Web3 community to generate revenue from advertising. Advertising revenue generation is an important way for traditional online communities to generate income, but so far, due to various reasons, the advertising business in the Web3 world has not been able to achieve effective development.

Winning homepage:

AbswapX

Winning homepage:https://ethglobal.com/showcase/abswapx-jmefw

AbswapX can be understood as an automated module that enables limit orders and predetermined strategies for DeFi. Specifically, AbswapX has created an automated module for any contract wallet or EOA wallet to be able to create limit orders 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 a limit order, they specify the specific token pair, price relationship, and trade volume;

2. Afterwards, the limit order will be added to the AbswapX order book. AbswapX utilizes Gelato Network to create proxy tasks with call data according to the user's specified requirements.

3. When the price reaches the user's specification, Gelato Network automatically executes the transaction, and then exchanges the user's token for the desired token at the specified price.

Winning homepage:

Tanuki

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

Tanuki is a trustless wallet activity scoring protocol that uses ZKP to trustlessly read historical activity on the chain to calculate a wallet score.

Due to various needs (such as airdrop basis), many protocols now need to score wallets that have interacted with each other. However, most of the current scoring methods are carried out outside the chain, so there are problems such as centralization, lack of transparency, and the need for additional trust. . To solve this problem, Tanuki chose to use the ZK coprocessor Axiom to read and summarize historical data on the chain in a trustless manner, which enables each protocol to calculate relevant indicators fairly and transparently and promote trustless interaction.

Winning homepage:

YORU

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

YORU is a social payment tool with privacy protection function. From the perspective of the project, there are two main challenges in the current social payment of cryptocurrencies. One is that anyone can track transaction history. Transactions on the chain are transparent, and anyone can track the balance of the wallet from the same address; second, the user experience on Web3 is very bad, the address is complicated and difficult to remember, and each transaction requires gas fees (especially to extract some Assets need to prepare ETH in advance). To solve these two problems, YORU uses account abstraction and stealth addresses to transfer tokens.

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

Winning homepage:

SuperPlay

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

SuperPlay is a user-friendly game platform, its operation process and features are as follows:

After the user visits the game project website and registers, SuperPlay will automatically create a contract wallet related to its email address; in this wallet, the user owns a small amount of ERC 20 tokens of the game project to obtain a certain period of time (such as within a week) ) game experience qualification; during this time, the user does not need to use any assets in the wallet, and the game project party will advance the relevant gas; after the trial is over, the user can choose to cancel or subscribe to the game; when continuing to subscribe, the user can choose to use a credit card to pay Pay for the game subscription, which will be automatically deducted from their contract wallet on a weekly basis.

Winning homepage:

POMPoarding

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

POMPoarding provides a simple Web3 community collaboration tool.

POMPoarding allows community members to combine 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 utilizes Push Protocol and The Graph to Manage messaging between communities; on the back end, POMPoarding leverages SAFE to create a multi-signature wallet for governance, financial management, and more.