The problem HashX solves

⏳ HashX

A Permissionless Optimistic Oracle on Hedera Built Using Timelocked Puzzles

HashX is a privacy-preserving oracle protocol for creating and resolving prediction markets.
It ensures encrypted, verifiable, and delay-revealed voting using BabyJubJub-based ECDH and AES-256-CTR,
with rewards distributed via Merkle proofs.

Challenges I ran into

Challenges

• Linking between Prediction Market and Optimistic Oracle, such that flow becomes atomic.
• Automated Voting Resolution Logic
• Time Lock Puzzle Formation

Overview

• Verifier Secret Key generated during oracle creation.
• Public parameters (RSA modulus N, base a, iterations t) published on-chain.
• Encrypted voting using EIP-712 typed signatures → ephemeral keys → AES-encrypted ballot.
• Privacy: Voters cannot prove their votes until resolution.
• Rewards: Distributed proportionally to stake via Merkle proofs.
• Solver Reward: Default 5% of oracle value.
• Integration: Full Hedera EVM Testnet with RainbowKit.
• Staking: Lock HBAR → wrap to WHBAR for voting power via HBARLockingContract.