Honestly, there's a little-known truth about losing money in DeFi — you might think it's due to market judgment failure, but in reality, it's often because of something more hidden. Roughly speaking, at least 30% of losses don't originate from market conditions but from an insidious factor: data poisoning.

How disgusting is this "killing move"? You leverage trade, the exchange's market remains stable, but suddenly a blow comes on the on-chain contract; you participate in a prediction, and the result everyone knows is contradicted by the on-chain judgment. Only after reacting do you realize — the biggest vulnerability of the blockchain's so-called "trustless sanctuary" is that black box providing it with data: the oracle.

Today, I won't talk about empty theories. Let's discuss the APRO project. It doesn't claim to change the world; it focuses on one direction — acting as the "security guard" for on-chain data.

**What does it do?**

Think of those routines in blockchain games: the card draw probability is set at 1%, but the backend's random number is actually controllable by developers; you collateralize assets to borrow money, and the valuation suddenly drops by 30% due to a hidden data source, leading to liquidation. These aren't made-up stories; they're everyday occurrences in the "dark forest" of on-chain activity.

APRO aims to build a firewall with two layers:

**First layer: AI Sentinel** — not to let AI make up stories blindly, but to make it a "defect hunter." It quickly detects abnormal price fluctuations, data source contradictions, suspected wash trading patterns. Poisoned data hasn't even been on-chain yet, and the red flag is raised early.

**Second layer: Node Consensus Court** — AI's judgment isn't final; data must pass through a group of independent nodes. Want to cheat? You'd have to simultaneously compromise the AI model and most nodes, which is prohibitively costly.