The ultimate goal of the Plasma framework is clear: scaling, massive scaling. What does this mean? The transaction fees must be much lower than those on the Ethereum Mainnet, which is a hard metric.

Therefore, the Gas mechanism design on the Plasma sidechain has become a key issue. It must solve two problems: first, to truly reduce transaction costs; second, to build an economic security defense line to keep out those who want to cause harm—especially threats like witch attacks.

I noticed that the Gas mechanism design of the Plasma sidechain is actually quite interesting. It does not simply replicate the fee model of the mainnet, but instead needs to find a balance between cost and security. Low fees are a weapon to attract users, but if the threshold is too low, the cost of attacks will also decrease. This game is very subtle.

Many Layer 2 solutions are currently researching similar issues, but the specificity of Plasma lies in its exit mechanism and data availability assumptions. The gas pricing strategy must take these architectural characteristics into account; otherwise, the entire security model may have vulnerabilities.