I just reread several stories about how people lose assets due to a lack of understanding of security mechanisms in blockchain. The issue is not that they were negligent — it’s just that gas fees and transaction security often remain a “blind spot” for most users.

Let's figure out what is really happening. When you interact with any dapp, you often click the “Authorize” button without thinking about the consequences. Here lies the first trap — unlimited authorization. You essentially give the contract permission to withdraw all your tokens at any moment. Malicious actors exploit this constantly, especially during minting popular NFTs or participating in unverified DeFi projects.

The second point that is often underestimated is gas manipulation. Attackers can force you to pay ten times more through fake frontends or embedded in the contract “infinite loops.” You pay, but the NFT or tokens never arrive. The third danger is simple phishing links that look like official ones but lead to fake sites where you’re asked to sign malicious transactions.

How to protect yourself? The first rule: never authorize “indefinitely.” Choose a custom amount and authorize only the minimum for a specific operation. After use, revoke authorization. Second: enable advanced gas control in wallets like (MetaMask, TokenPocket), and manually set a maximum limit. Before each transaction, check current prices on Etherscan or Arbiscan — if the offered price is much higher, just decline.

Third: be paranoid about links. Only get them from official websites and verified accounts. Check the contract address, transaction amount, and gas parameters before confirming. And finally — use a “dual-wallet” strategy: keep only a small amount in your hot wallet for daily operations, and store main assets in a cold or hardware wallet.

What if something still goes wrong? You have a precious 10 minutes. Immediately freeze operations in your wallet, mass revoke authorizations for suspicious contracts, take screenshots of transaction hashes and addresses. Mark the transaction as suspicious on blockchain explorers, notify your wallet and dapp about the incident. If losses are serious, contact professional security organizations — they can track the movement of funds through the chain.

One important tip: don’t try to solve the problem yourself if it’s big. Don’t pay anyone for “unfreezing” assets — that’s the second wave of attack. And don’t delete your wallet hoping for salvation — deletion does not revoke authorization. The correct order: first cancel all authorizations, then reset the wallet.

In my opinion, transaction security is not just a technical detail, it’s your first line of defense. Three simple principles — minimize authorization, perform operations with delay, and react quickly to problems — will help you avoid most risks. Blockchain is secure, but only if you know what to pay attention to.