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Lead in: Phalcon's Hack Blocking Saga

April 23, 2024
3 min read

Since BlockSec's debut in 2021, we have long maintained that code auditing alone cannot solve all Web3 security issues. Therefore, we have been investing in exploring new paradigms for Web3 security. Thus we created Phalcon, the world's first crypto hack-blocking system.

Before the launch of Phalcon, the system had been running internally for 2 years, successfully blocking over 20 hacks, and rescuing more than 20 million USD worth of assets, including $3.8M for Saddle Finance, $2.4M for Platypus, $5M for ParaSpace, and more.

In this series of articles, we will present representative stories of our system Phalcon. In sharing these cases, we aim to do more than validate the effectiveness of our system. We also want to demonstrate the transformative effect of proactive defense measures.

In the face of threats, we are not powerless. Together, we can usher in a new era of Web3 security.

Breaking Down: A Comprehensive Overview

About Phalcon

Phalcon is a security platform developed by BlockSec to monitor and block hacks. The system detects suspicious transactions, instantly alerts users, and takes automated actions in response.

Use cases of Phalcon
Use cases of Phalcon

Phalcon is a SaaS platform where users can directly log in through our official website to view different pricing plans and features, and subscribe immediately (supporting both credit card and crypto payments). For any questions, feel free to book a demo with our security experts who will address your concerns.

Support Tool: Phalcon Explorer

Phalcon Explorer is a support tool for the Phalcon platform. This powerful transaction explorer is designed for the DeFi community. It provides comprehensive data on call flows, balance changes, and transaction fund flows, as well as supports transaction simulation. This helps developers, security researchers, and traders to more intuitively understand transactions.

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NEAR Intents Exploit: Refund Flaw and Security Lessons
Security Insights

NEAR Intents Exploit: Refund Flaw and Security Lessons

The NEAR Intents exploit used oversized refund events to preserve internal balances after the deposited assets were returned. This analysis reconstructs the receipt flow and seven BNB Chain withdrawals totaling 3,865,021 USDT, distinguishes those outflows from the project's reported full recovery, and outlines security considerations for developing and auditing NEAR smart contracts.

~$5.57M Lost: X100 Freezer, NEM Exploits | BlockSec Weekly
Security Insights

~$5.57M Lost: X100 Freezer, NEM Exploits | BlockSec Weekly

This weekly report covers two security incidents on Ethereum and BNB Chain from October 19 to October 25, 2026. It examines a flash-loan-funded governance takeover of X100 Freezer and a tax-settlement flaw affecting a NEM token liquidity pool on BNB Chain. Estimated losses within the report's scope total approximately $5.57M: ~$4.75M from the representative X100 transaction and ~$820K from the NEM pool incident. The total excludes separately reported follow-on X100 extractions.

~$3.87M Lost: Autheo Network, UNCX Hacks | BlockSec Weekly
Security Insights

~$3.87M Lost: Autheo Network, UNCX Hacks | BlockSec Weekly

This weekly report covers 3 security incidents from October 12 to October 18, 2026, with approximately $3.87M in total estimated losses. Autheo Network suffered a ~$1.76M private key compromise, Qubic Wallet lost ~$1.30M due to weak seed generation, and UNCX Network's Smart Token Vesting V2 contracts suffered an ~$807K accounting error across Ethereum, BNB Chain, Base, and Robinhood Chain. The highlighted UNCX analysis explains how a flawed aggregate share calculation mixed vesting tranches created at different token-to-share ratios and enabled excess withdrawals from shared pools.