Holistic Security for DeFi Securing Your Smart Contracts
Secure your code pre-launch and block attacks in real-time. Safeguard both user assets and your reputation.
Find and fix critical issues in your smart contracts before you launch.
Make sure your business logic is sound and free of flaws.
Always monitor mempool and on-chain transactions for suspicious activities.
Receive instant alerts on new threats such as oracle manipulation and flash loan attacks.
Block confirmed exploits in real-time to prevent them from draining funds.
Start on-chain responses, such as pausing contracts, to neutralize active threats.
Understand complex attack vectors to gain actionable intelligence. Help you proactively harden your protocol against emerging threats.
Secure Your Protocol Across Its Entire Lifecycle
“Partnering with BlockSec has been crucial to Tokenlon's mission of preserving the openness of DeFi while leveraging technology to create a safer, more trustworthy space for all. BlockSec's cutting-edge on-chain analytics allow us to identify high-risk addresses across multiple blockchains and navigate complex global regulations with confidence. Their expertise helps us safeguard our liquidity partners and consistently deliver a seamless, reliable DeFi experience for genuine users.”
Newsletter - January 2026
In January 2026, the DeFi ecosystem experienced three major security incidents. Truebit Protocol lost ~$26M due to an integer overflow vulnerability, SwapNet and Aperture suffered ~$17M from improper input validation and allowance abuse, and Saga incurred ~$7M following a shared base-layer code vulnerability.
$1.26 Billion Frozen: USDT Blacklisting on Ethereum and Tron in 2025
Tether blacklisted over 4,100 unique addresses and froze nearly $1.3 billion in USDT on Ethereum and Tron during 2025. Here's what the on-chain data tells us, and what you can do to protect yourself.
$17M Closed-Source Smart Contract Exploit: Arbitrary-Call Vulnerability in SwapNet and Aperture Finance
An in-depth analysis of the $17M closed-source smart contract exploit affecting SwapNet and Aperture Finance, caused by an arbitrary-call vulnerability. We reconstruct attack paths from decompiled bytecode and on-chain traces.
For 500+ clients, from Web3 leaders to global regulators
