Buggy ERC-20

RareSkills created a new learning resource: Buggy ERC-20s

Buggy ERC-20s is a repo of 20 (yes that is intentional) ERC-20 contract implementations, but with a bug.

As much as possible, we tried to make these bugs reflect the kind of mistakes developers actually make.

This is a learning exercise we use in our Solidity Bootcamp, but as you know, we make all our learning resources free.

You'll sharpen your eye to catch missing lines, compiling but incorrectly-behaving code, and important corner cases.

This isn't a normal CTF, we don't provide unit tests for you to check your answer since that isn't realistic. You'll have to tackle the problems the way an auditor normally does!

We made a fairly large collection of problems because we want you to get some repetition in your practice. Practicing isn't one-and-done. Although there are some similar bugs between tokens, none of the repos have identical bugs. Each repo has one bug, and the bug is serious and not hypothetical. Some of the bugs are obvious and some are subtle.

Consider yourself experienced? Then you should be able to spot the bug in less than a minute per codebase.

Jumping into auditing a large codebase can be intimidating, so we made this as a stepping stone.

A link to check it out:

Link: https://github.com/RareSkills/Buggy-ERC-20