Knockout
Tokyo Builders’ Arena 2025 (Sui × ONE Championship) - 1st Place (33 teams) | Role: Tech Lead
A participatory leveraged betting app for combat sports. Users pick a fighter (Team A / Team B) and tap to increase their leverage — stake is calculated as base_stake × n^taps. Built on Sui blockchain for transparent, tamper-proof bet logic and fund caps. Features round-based time limits with KO and time-up mechanics, real-time updates via Supabase Realtime, and a mobile-first PWA experience.
Polynance Pay
Trend Hack 2025 (Solana Breakout) - Superteam Japan 2nd Place | Role: Tech Lead
An open trading tool that enables people to trade crypto with information from Polymarket. Combines prediction market data with Solana-based payment and trading functionality.
Prophet.fun
Consensus Hong Kong 2025 - OriginTrail Track 3rd Place (67 projects, $400K+ pool) | Role: Tech Lead
A platform for users to make prophecies and stake their own money in natural language, like a Twitter for predictions. Users create prophecies, share them as social cards, and redeem or execute them on-chain. Features a vector database simulation for semantic matching of predictions and an oracle verification system using OriginTrail’s Knowledge Graph.
PreSwap
ETH Global Bangkok 2024 - Blockscout Explorer Big Pool Prize & Mantle Best DeFi Project (713 projects, $750K pool) | Role: Tech Lead
A new protocol to solve existing prediction market problems. It uses a vector database (Supabase pgvector) to store and manage prediction market data from platforms like Polymarket and Kalshi, classifying markets by semantic similarity. LLM embeddings vectorize market descriptions to identify similar markets, and ERC1155-based smart contracts enable conditional token creation. It automatically connects similar markets across languages and platforms, solving liquidity fragmentation.
TrendMarket
ETH Global Singapore 2024 - Worldcoin Best Use of World ID 1st Place & AirDAO Prediction Market 1st Place (309 submissions, $325K pool) | Role: Tech Lead
An innovative prediction market using LLM technology to create and execute markets with minimal human involvement. It solves the quality/liquidity dilemma in prediction markets through AI-driven curation. LLMs handle market creation, proposal outcomes, and matching, enabling fully on-chain transactions without human intervention. Uses a CPAMM contract and a collective AI decision-making process to replace traditional oracles like Chainlink or UMA.
RadicalxChange in Libraries
EY Strategy Student Rule Formation Contest 2024 - 3rd Place (~100 teams) | Team: 42Tokyo
Proposed a democratic transformation of public libraries using blockchain and quadratic voting (RadicalxChange). Identified three key issues: underutilized reading records, arbitrary book selection by librarians, and limited library roles. Solution: blockchain-based material management linked with private reading records, and quadratic voting to reflect minority opinions in book acquisition decisions.
CarbonMobilityLedger
web3 Global Hackathon 2023AW - web3 Foundation Category Winner | Role: Tech Lead
“Your Miles Matter: Move Smart, Earn Smart” - A CarbonDrive App using EVM-compatible public blockchains to implement a “Mobility Carbon Credit” system that incentivizes sustainable mobility. Users earn CarBon Token (CBT) based on driving distance and vehicle level. CBT can be used for EV battery charging (1 CBT = 1 JPY) and tree planting donations. Features include car NFT leveling and a tokenomics system to prevent used car price depreciation.
Enn-Drive
web3 Global Hackathon 2023AW - Mazda Excellence Award
A platform that uses Web3 technology to evaluate driver behavior and promote better driving habits. Drivers give each other “likes” through a mobile app as positive feedback, encouraging good driving behavior. Features zkLogin and SponsoredTransaction for wallet-less participation, and provides a safe driving value index SDK that third-party developers can integrate into their own products.
ChatGroupWallet
ETH Global Tokyo 2023 - Polygon Pool Prize (1,500+ participants, 311 projects) | Role: Tech Lead
Using Push Protocol’s chat function to create group chats and automatically generate a shared wallet for the group. Skip tedious accounting - just create a group chat to open a common account. Features a smart contract that aggregates payments and handles refunds proportionally when the group disbands. Also supports B2B use cases with approval-based remittance flows via chat, and can be used for DAO fund management.