Blockaid Transaction Security is a security solution designed for Web3 applications that simulates and validates blockchain transactions in real time before they are executed. The product enables users to understand state changes and outcomes that would result from transaction execution. The solution provides transaction preview capabilities that reveal the onchain impact of transactions before they are signed, with latency under 300ms at the 99th percentile. It includes security assessment features that flag complex attack scenarios, protect against wallet drainers, prevent unauthorized asset transfers, and block interactions with malicious contracts. The platform performs entity evaluation to log security and regulatory information on addresses involved in transactions, identifying fund transfers to malicious addresses, protecting against address poisoning, and preventing interaction with OFAC-sanctioned entities. Blockaid supports multiple blockchain networks including Ethereum, Solana, Base, Linea, Blast, Optimism, and Bitcoin. The solution includes support for generic EIP-712 signatures, EIP-4337 account abstraction, and bulk transaction processing. The product is integrated directly into Web3 wallets and interfaces, processing over 180 million transactions monthly across its network of integrated platforms.