Imagine walking into a casino, where the dealer’s hand always hides in a dark drawer, and you can only see the final outcome laid out on the table. In such a scene, a normal person would have already turned around and left. Yet, in today’s Web3 games, nine out of ten players and investors are actually playing this kind of game. Everyone is passionately discussing token models, graphics effects, and blockchain speeds, but they turn a blind eye to the core element hidden in the shadows—the random number generation mechanism.

To be more precise: smart contracts are like judges in a courtroom, and verifiable randomness functions (VRF) are judges who are absolutely impartial and cannot be bought.

Currently, most chain game projects treat randomness as a mere formality. Development teams often use block hash values as the source of randomness, which sounds familiar—like letting the village accountant decide the lottery numbers. On the surface, it’s transparent, but in reality, the accountant and the village chief could collude at the moment of recording the transaction. When a top-tier item worth tens of thousands of ETH is about to be generated, miners or validators with block production rights can exploit the tiny margin of manipulation to force the random result in their favor. Such predictability or manipulation of randomness leads to unfairness, which is the behind-the-scenes culprit behind the decline of many chain game projects.

By 2025, as full-chain games and autonomous worlds rise, VRF is no longer an optional feature but a critical dividing line for survival. The beauty of VRF lies in its “verifiable” aspect—it generates random numbers along with a cryptographic proof. To draw an analogy: it’s like rolling dice, but not only do you get a number, you also present proof of the entire process’s authenticity on the table.