I run wallets on ETH, Base, and SOL personally — Allitrade.base.eth is mine, and I'm not precious about saying that, because I've made most of the mistakes on this list at some point too. Everyone in this space has a story about a close call. The people who don't have a "funds gone" story usually just haven't been in it long enough yet. This isn't theoretical for me. It's the same five mistakes, over and over, and they're all completely avoidable once you actually understand what's happening under the hood.
Mistake 1: Storing Your Seed Phrase Digitally
Screenshots. Notes app. iCloud backup. A photo in your camera roll "just for a minute." I see this constantly, and every single one of these is a direct line from your wallet to anyone who compromises that device, that cloud account, or that backup. iCloud and Google Photos back up automatically — the second you screenshot a seed phrase, it's syncing to a server you don't control, sitting in a data center, one credential-stuffing attack away from being someone else's problem to steal.
Your seed phrase belongs on paper, or better, on a steel backup plate, stored somewhere physical and offline. Two copies, two separate locations — a fireproof safe and a bank safety deposit box is a reasonable split for anything holding real value. Not a password manager, not an encrypted note, not a photo "protected" by a phone passcode. If it ever touches a device connected to the internet in a readable format, treat it as already compromised and move funds to a new wallet immediately, not "when you get a chance."
Same logic applies to writing it down somewhere a cleaner, roommate, or houseguest could casually photograph in ten seconds. Physical security is still security. A perfectly offline seed phrase taped under a keyboard is functionally the same mistake as a cloud screenshot — it's just a slower version of the same failure.
Mistake 2: Blind Signing Transactions
Your hardware wallet shows you a transaction to approve, and it's a wall of hex data you don't understand, so you click confirm because the dApp told you it's fine. That's blind signing, and it's how a huge share of wallet drains actually happen — not through stolen seed phrases, but through victims voluntarily signing a malicious transaction because they couldn't read what they were approving.
Use a wallet and hardware device that supports transaction simulation or decoding — Rabby, or a Ledger paired with a clear-signing-compatible interface — so you see plain-English "this will transfer X token to Y address" before you sign, not raw hex. If your setup can't show you that, slow down. A transaction that takes ten extra seconds to verify is infinitely better than one that empties your wallet in one click.
Mistake 3: Keeping Too Much in a Hot Wallet
A hot wallet — MetaMask, Phantom, any browser extension wallet connected to the internet — is convenient and that convenience is exactly the attack surface. Malicious browser extensions, compromised dApp front-ends, and clipboard hijackers all target hot wallets specifically because they're always online and always one interaction away from signing something.
I run the 10% rule: no more than 10% of total holdings sit in a hot wallet at any time. Everything else lives in cold storage — a hardware wallet like a Ledger or Trezor, air-gapped from any browser session. The hot wallet is your spending money for active trading and dApp interaction. The cold wallet is your actual net worth. Don't let those two roles blur into the same device.
This also means using genuinely separate wallets, not just separate "accounts" inside the same seed phrase — a compromised hot wallet extension can potentially expose everything derived from the same root key depending on how the exploit works. Different seed, different device, different purpose. The friction of moving funds between them is the point, not a bug in the system.
Mistake 4: Unverified dApps and Unrevoked Approvals
Every time you connect your wallet to a dApp and approve a token spend, you're granting a smart contract ongoing permission to move that token — sometimes an unlimited amount, indefinitely, until you manually revoke it. People connect to dozens of dApps over months of activity and never once check what's still approved. A single old approval to a since-compromised contract is a live vulnerability sitting in your wallet right now, dormant until someone exploits it.
Check your approval history on revoke.cash or Etherscan's token approval checker at minimum quarterly. Revoke anything you don't recognize or don't actively use. Yes, revoking costs a small gas fee. Pay it. It's cheaper than the alternative by every possible measure.
# Sets the approved spender's allowance to zero
cast send <TOKEN_CONTRACT_ADDRESS> \
"approve(address,uint256)" <SPENDER_ADDRESS> 0 \
--private-key $PRIVATE_KEY --rpc-url $RPC_URL
# Always verify the spender address before signing — never blind sign this either
Mistake 5: Social Engineering via "Support"
No legitimate project's support team will ever DM you first on Discord or Telegram. No real support agent will ever ask for your seed phrase, ask you to "verify your wallet" by connecting it to some external tool, or ask you to screen-share while you type anything sensitive. Every single instance of that pattern is a scam, with zero exceptions I have ever seen in this industry.
The playbook is always some version of: fake urgency ("your funds are at risk, act now"), a link to a convincing but fake support portal, and a request that ends with you either revealing your seed phrase or signing a malicious approval transaction disguised as "verification." Screenshot it, report it, block it, and never engage past that point. If you have a real support issue, go to the project's official site directly — never through a DM that found you first.
Fake giveaways run the same playbook with different bait — "send 0.1 ETH, receive 1 ETH back" scams still work on people in 2026, which tells you everything about why this keeps happening. If a deal requires you to send funds first to receive more back, it is not a deal. It's the entire scam, start to finish, dressed up with a verified-looking checkmark and a bot army of fake replies underneath.
None of these five mistakes require sophisticated hacking to exploit. They require you to be tired, rushed, or trusting for about thirty seconds. Fix your seed phrase storage, learn to read what you're signing, respect the 10% rule, audit your approvals, and treat every unsolicited DM as hostile until proven otherwise. That's the whole job.
