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.”
~$4.72M Lost: TAC, Transit Finance & More | BlockSec Weekly
This BlockSec weekly security report covers 3 notable attack incidents identified between May 11 and May 17, 2026, across TRON, TON, and Ethereum, with total estimated losses of approximately $4.72M. Three incidents are analyzed in detail: the highlighted $1.88M Transit Finance exploit on TRON, where a deprecated swap bridge contract with lingering token approvals was exploited through arbitrary calldata forwarding; the $2.8M TAC TON-to-EVM bridge exploit caused by missing canonical wallet verification in the jetton deposit flow; and the $46.75K Boost Hook exploit on Ethereum, where spot price manipulation on a Uniswap V4 hook-based perpetual protocol forced the protocol to buy tokens at inflated prices using its own reserves.
~$15.9M Lost: Trusted Volumes, Wasabi & More | BlockSec Weekly
This BlockSec bi-weekly security report covers 11 notable attack incidents identified between April 27 and May 10, 2026, across Sui, Ethereum, BNB Chain, Base, Blast, and Berachain, with total estimated losses of approximately $15.9M. Three incidents are analyzed in detail: the highlighted $1.14M Aftermath Finance exploit on Sui, where a signed/unsigned semantic mismatch in the builder-fee validation allowed an attacker to inject a negative fee that was converted into positive collateral during settlement; the $5.87M Trusted Volumes RFQ authorization mismatch on Ethereum; and the $5.7M Wasabi Protocol infrastructure-to-contract-control compromise across multiple EVM chains.
Newsletter - April 2026
In April 2026, the DeFi ecosystem experienced three major security incidents. KelpDAO lost ~$290M due to an insecure 1-of-1 DVN bridge configuration exploited via RPC infrastructure compromise, Drift Protocol suffered ~$285M from a multisig governance takeover leveraging Solana's durable nonce mechanism, and Rhea Finance incurred ~$18.4M following a business logic flaw in its margin-trading module that allowed circular swap path manipulatio
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