Exchange SecurityVerified Reference • August 2026
Zero-Confirmation Anti-Fraud Defenses
A zero-confirmation transaction is an unmined transaction broadcast to the peer-to-peer network but not yet included in a cryptographically sealed block.
Core Architectural Highlights:
Never credit user account balances based purely on unconfirmed mempool broadcasts.
Enforce minimum block confirmation thresholds (12 blocks on Ethereum, 19 blocks on TRON).
Deploy multi-node mempool sniffers to detect competing double-spend payloads in real time.
1. Double-Spend Vector Anatomy
An attacker broadcasts Transaction A to merchant node with low gas fees, while simultaneously broadcasting Transaction B (with identical nonce sending funds back to attacker) directly to block builders with higher priority fees.