How To Stay Safe With DeFi

[00:00:00]You wanted to escape the middleman. You did. And the second you signed your first transaction, you became your own compliance officer and your own security team. The web 2 bank had FDIC insurance and a customer service line. Defi has revoke.cash and a Discord channel.

[00:00:20]Nobody is coming to save you.

[00:00:22]Sovereignty has a price of admission and that's it. Most beginners take the freedom part and skip the responsibility part, which is exactly how a wallet got drained for millions in staked positions earlier this year without their hardware wallet making a single sound to warn them. We'll get to how that happened because if a ledger sitting on a desk couldn't stop it, you need to understand what it actually protects and what it doesn't. But first, the bigger picture, because the data tells a story almost nobody is telling correctly. Roughly $3.4 billion was stolen from crypto across 2025 year to date. And most of the headlines blamed DeFi protocols. The headlines were wrong. Chain analysis tracked the migration across 2022 through 2024. Personal wallet compromises climbed from a small slice of total stolen value to nearly half of it. The attack surfaced moved. protocols got harder to break and users didn't.

[00:01:22]Which means the risk now lives in your wallet, your browser, and your signing habits. Almost nobody in crypto media is telling beginners that the call is coming from inside the house. So, we're going to fix that. Five mistakes, five fixes, and a checklist that you can run before every interaction. This is the educator's job today, and I'm going to be blunt about every single one. Mistake number one is the one that drained that wallet. So, we start there. Unlimited token approvals. When you interact with a DeFi protocol, you sign a permission.

[00:02:01]That permission tells a smart contract how much of your tokens it's allowed to move on your behalf. Now, most frontends default to unlimited because it's convenient. Approve once, trade forever, and that permission never expires. It sits there live attached to a contract you've long since forgotten about until you actively revoke it or until that contract gets exploited and an attacker walks in through a door that you left open. Approval-based attacks have caused hundreds of millions in losses across 2024 and 2025 by the trackers that follow this stuff. Seriously, the permit signature variant is the worst of them because it's gasless. No transaction prompt and no gas fee. You sign what looks like a routine wallet message and minutes later your staked positions are gone. And here's the part the cipher punk ally in me wants to hammer on because hardware wallet maximalists keep getting this wrong. If a hardware wallet protects your private key but does nothing to stop a contract that you already proved from draining you. You have to ask what you're actually securing. Hardware wallets secure keys, not approvals. If you signed an unlimited approval with a ledger, that contract has the same permission it would have with a hot wallet. The ledger marketing won't tell you that. I just did. The fix is mechanical. Revoke.cash works across 100 plus networks and either scan has a token approval checker built into the explorer. So run it monthly. Revoking costs a few cents on a layer 2 and a few dollars on Ethereum mainet and it's the cheapest insurance you'll ever buy. So set a calendar reminder for the first day of every month because the next mistake is more expensive. Now mistake number two is chasing yield without underwriting the risk. Balancer v2 was drained for roughly $128 million in November 2025.

[00:04:05]The exploit was a rounding error in pool invariant calculations where arithmetic precision loss combined with crafted batch swaps. Here's a detail that should burn into your brain. Balancer v2 had been audited by multiple leading security firms. Audits are a floor, not a ceiling. They prove the code does what it was reviewed, not that it's safe under every attack vector someone hasn't imagined yet. Cedus lost roughly $220 million earlier in the year. The Coinbase insider compromise landed somewhere in the hundreds of millions, depending on whose accounting you trust.

[00:04:43]Cumulative DeFi lending losses now run into the billions on DeFi Lama's tracker. Those are the numbers behind the high APY screenshots in your timeline. You should treat any DeFi deposit above 1 to 2% of your net worth as a risk underwriting decision, not a yield decision. If you can't articulate out loud in one sentence exactly how the protocol could lose your money, you haven't done the work yet. Now, mistake number three is the one that turns Balancer from a headline into something much darker. Barrachain. Barachchain's native DEX which forked balancer v2 was exposed to the same vulnerability class and the response from chains in this position has historically been validator coordination to reverse the damage which raises a question that matters more than the dollar figure. If a validator set can vote to reverse transactions when something goes wrong, how is that different from a bank reversing a wire transfer? And if it isn't different, what are we actually paying for in gas fees and complexity? This is not decentralization. It's a database with extra steps and a marketing department.

[00:05:59]Real immutability means the network does not save you when you're wrong. Because the same property that won't save you is the property that prevents anyone, a government, a corporation, a court order from reversing your transactions. either you can't have censorship resistance for yourself and reversibility for your friends. You have to pick one. The chains that pick reversibility are not what we're here for. So before you deposit anywhere, look up whether the chain has ever rolled back state. If it has, you're not on the hard money rails.

[00:06:35]You're somewhere else entirely, and you should know that before you deposit.

[00:06:40]Now, mistake number four is using one wallet for everything. Your KYC centralized exchange deposits flow into the same address that connects to every DAP you've ever clicked on, which means every approval and every signature is permanently linked to a realworld identity in some compliance database somewhere. North Korean actors have pulled multiple billions from crypto users since 2022. And they don't pick random addresses, they pick targeted ones. Targeting requires a graph and your one wallet for everything habit is building that graph for them. The fix is not paranoia. Three wallets minimum.

[00:07:19]Okay. A cold wallet holds long-term positions and never touches a DAP. A separately funded hot wallet handles active DeFi with small balances only.

[00:07:30]And a burner waits for any new protocol you haven't built trust with yet.

[00:07:35]Mistake number five is depositing without an exit plan. A is the safest large lender in DeFi. Tens of billions in TVL audited, formally verified, years of battle testing. And earlier this year, a restaking contagion even dumped hundreds of millions in bad debt into the ecosystem. And a saw billions in TVL outflow over the contagion window. When that contagion hit, where was your exit plan? Did you even have one written down before you deposited? Plenty of people got hurt who thought they'd done the work. The lesson is not that a is dangerous. The lesson is that even the safest venue in DeFi can experience a contagion event, and the users who survived it had predefined exit triggers in writing before they ever supplied collateral. What TVL drop forces an exit? What bad debt ratio? What governance signal? Plenty of depositors couldn't answer those questions on the day it mattered. And the ones who couldn't were not investing. They were hoping. So, here is the safety checklist. Run it before every transaction. One, verify you're on layer 2 for any position under $2,000 because compounding $500 on mainet at $20 a transaction is just paying the gas market to delete your capital. Step two, simulate the transaction before you sign. Tenderly, Pocket Universe, or Blowfish all work, so pick one and use it every time. If the simulator shows token movements you didn't expect, do not sign. Step three, check the permit field carefully because gasless signatures are the highest risk signatures you will ever produce. And if you don't know what the message is asking for, just close the window. Step four, revoke monthly on a calendar reminder set for the first of every month. 2 minutes at revoke.cash and the door is closed behind you. Step five, write the exit plan before you deposit, not after the headline breaks. This is all learnable. The people who survive DeFi aren't smarter than you. They're more disciplined. They run the checklist. They segment their wallets.

[00:09:55]They read what they sign. And they accept that sovereignty is an operational practice rather than a one-time purchase. Now, the free weekly report at learningcrypto.com breaks down what hit the market and what we're watching next. There's zero commitment, and it's the cleanest way to see whether the work matches what I just told you.

[00:10:14]So, whatever you decide from here is yours to decide. Just don't sign anything you haven't read yet. Thanks for watching. I'll see you in the next one.