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security • ctf • smart contracts • ethereum

Writeup of Paradigm CTF: Bank

February 14, 2021
This is a writeup of the “bank” challenge, which I was the first to solve, from the Ethereum Paradigm CTF.

security • ctf • smart contracts • ethereum

Writeup of Paradigm CTF: Vault

February 9, 2021
I was the first to solve a particularly interesting smart contract challenge in a recent CTF competition. This post explains the vulnerability I found and how to exploit it.

firebase • firestore

Building a Leaderboard With Firestore: OrderBy and Limit

January 14, 2021
Firestore queries can sort and limit the data they retrieve using precomputed indexes. Security rules can limit what types of queries are allowed.
Copyright © 2020 Steve Marx