$3 million stolen, and this letter to the hacker is just heartbreaking. On-chain it says: Even if you're willing to return 80%, or 50%, I would be extremely grateful. This is my retirement fund, tied to my life and my children's future. I'm begging you, please return the money. In the AI era, never underestimate the security risks of crypto assets! (Especially with all kinds of DeFi protocols on-chain) If you have the ability to manage private keys, store large, long-term assets in cold wallets as much as possible (hardware wallets, offline phone solutions, etc.). Buy devices from official channels, back up seed phrases offline, and never share them with anyone. If you can't handle self-custody properly, it's better to use large, compliant centralized exchanges available in your region like Binance, OKX, Coinbase, or Upbit. Set up two-factor authentication, withdrawal whitelists, and account segregation. But don't carelessly put your entire fortune in a hot wallet that's constantly connected to various DApps.