project-sekai-ctf
sekaictf-2026
This repository contains the official source code and writeups for all challenges from SekaiCTF 2026, organized by category and difficulty level.
AI repository intelligence
FR-AI / ANALYSISWhy it is worth attention
It clearly explains the rationale behind each mechanism (whitelist, oracle abstraction, secured price oracle, vesting) and discusses trade-offs, making it a strong learning resource for developers.
Who it is for
- Smart contract developers learning real-world token sale patterns
- DeFi protocol teams designing a token sale with robust price oracles
- Security auditors reviewing ICO logic and oracle integration
- Students of Ethereum development seeking a well-documented template
Use cases
- Building an ICO with buyer whitelisting and cap enforcement
- Integrating multiple price oracles (Chainlink, Uniswap TWAP) with fail-safe checks
- Implementing token vesting with a TGE and linear release schedule
- Learning how to write fixture-based unit tests and live-node smoke tests for a sale contract
Strengths
- Educational clarity: each contract and mechanism is explained with its purpose and trade-offs
- Modular oracle design: ICO.sol uses an interface, enabling pluggable price sources and the secured oracle without modifying the sale logic
- Real-world mechanisms: includes whitelist, multi-asset payments, oracle staleness checks, and vesting with cliff
- Comprehensive testing: fixture-based unit tests plus a live-node smoke test covering edge cases
Considerations
- Uses a simple on-chain whitelist (mapping) rather than a Merkle tree, which scales poorly for very large buyer lists
- Deployment requires manually configuring oracle addresses per network; no hardcoded defaults
- Template is educational and may need significant customization for production use (e.g., regulatory compliance, frontend integration)
README quick start
Getting started
Description
Educational ICO template in Solidity: whitelisting, oracle pricing, vesting
