According to Ai 姨, the 'Review, Vouch, Slash' actions are key elements in the peer-to-peer mechanism, crucial for improving reputation scores and XP. The 'Review' involves providing a title, description, and sentiment (positive, neutral, or negative). 'Vouch' involves staking ETH to financially back one's support, with a 1% fee for staking and withdrawal. These mechanisms are pivotal in building trust and credibility on crypto platforms.