Personal site · London
I’m a crypto enthusiast, a long-term Bitcoin holder and I was passionate about smart contracts, Solidity auditing and competitive programming. I build and share what I learn along the way. I’m currently creating videos and sharing ideas on Twitter and YouTube.
Donations on Solana (SOL, USDC, or USDT): BduwmK79t16aJEo3s9PsSVfK5xDe3YqXrFAYqg9y5ALa
I enjoy smart contracts and Solidity auditing. You can find my work on Code4rena and Sherlock.
For code and ongoing notes, visit GitHub and my progress reports.
I also share smart-contract lectures on Bilibili.
I love competitive programming. Here are my profiles and archives:
Beijing University of Posts and Telecommunications
Bachelor’s in Computer Science · 2011–2015
Master’s in Information Security · 2015–2018
While at university, I maintained a monthly life summary on CSDN and a Chinese writing archive here.
Those posts are older, but they remain part of the record.
Notes on engineering, security, algorithms, and life.
It’s been a day and I still haven’t fully recovered.
haven’t seen you for a long time.
The goal of this level is for you to hack the basic token contract below.
You are given 20 tokens to start with and you will beat the level if you somehow manage to get your hands on any additional tokens. Preferably a very large amount of tokens.
This puzzle asks us to claim the ownership of this given smart contract. From the codes, we can see, the way for us to get the ownership is to let tx.origin and msg.sender different.
This puzzle is also very classic and almost appears on every solidity practice website.
This problem requires us to become the owner of this smart contract.
This may be the easiest problem in this series. All you need is careful observation.
This is a checkpoint to track the progress of my solidity audit work.
