The Quantstamp Blog

September 2026: The Approval Layer Was Exploited

Crypto lost $742.0M across 33 incidents in September 2026, almost three times August's $255.5M and the biggest month of the year so far. Bitget's $387M hack and Liquid Network's $320M exploit account for about 95% of that, with the other 31 incidents adding up to $35.0M. In August, the prices going into contracts were wrong. In September, attackers went after the systems that approve transactions in the first place. Here's the month in security 👇

Quantstamp Announcements

Quantstamp Enhances Security of New Nuo Contracts

Quantstamp recently enhanced the security of Nuo’s xSplit smart contracts, which serve to provide Nuo customers with the best prices possible by splitting customer orders across various exchanges. Nuo is a repeat customer of Quantstamp: their first audit was completed this April.

Quantstamp Labs

The Benefit of Functional Test Suites

A comprehensive test suite can prevent developers from accidentally merging functionality bugs into the master branch.

Quantstamp Announcements

Quantstamp Wins Cybersecurity in Blockchain Use Case Awards

Quantstamp is excited to share that we recently won first place in the Cybersecurity in Blockchain Use Case Awards. Organized by Disruptor Daily, these awards profile companies that are developing practical use cases for the cybersecurity industry.

Quantstamp Labs

How to Use DeFi Safely

With eye popping interest rates on lending platforms, it’s never been more tempting to put assets into some of the promising new #DeFi applications out there today. But is security an issue? Dr. Poming Lee, Security Engineer with Quantstamp, explains how to keep your funds safe when using DeFi.

Quantstamp Announcements

Quantstamp Enhances Security of Blockchain Certified Sports Memorabilia

On Monday, September 9th, BlockStar, a company authenticating real-world goods using blockchain technology, and DeMarchi, the iconic cycling apparel brand established in 1946, sold the world’s first blockchain certified replica of Fausto Coppi’s 1953 De Marchi Jersey for $10,500. Quantstamp facilitated the success of this sale by enhancing the security of the blockchain components and the website used to conduct the auction.

Quantstamp Announcements

Securing DeFi with PoolTogether

Quantstamp is facilitating the future of DeFi by enhancing the security of leading open finance projects like PoolTogether, a no-loss lottery and innovative savings account application.

Quantstamp Labs

What is a Re-Entrancy Attack?

Computer scientists say that a procedure is re-entrant if its execution can be interrupted in the middle, initiated over (re-entered), and both runs can complete without any errors in execution. In the context of Ethereum smart contracts, re-entrancy can lead to serious vulnerabilities.

Quantstamp Labs

Open Sourcing Our Bounty Protocol

We are open sourcing the code for our Bounty Protocol. A bounty protocol is a marketplace for developers to identify bugs in smart contracts that automation cannot detect. The Bounty Protocol has the potential to leverage software engineering talent from around the world to add an essential layer of infrastructure for blockchain security.

Quantstamp Announcements

Quantstamp Secures Binance's First Stablecoin

Quantstamp, a Y Combinator-backed blockchain security company, recently completed the audit of leading global cryptocurrency exchange Binance’s GBP-backed stablecoin, Binance GBP (BGBP). The BGBP token joins other stablecoins in the market including Coinbase’s USDC, Facebook’s Libra, MakerDAO’s Dai, and Bitfinex’s Tether, and is one of the first major stablecoins to be pegged to the British pound.