The Cost of Bad Security
In 2025, over $2 billion was lost to crypto hacks, phishing, and exploits. Most of it was preventable. A single malicious approval, one phishing link, or a leaked seed phrase — that's all it takes.
This isn't a scare piece. It's a practical checklist you can follow today to dramatically reduce your risk.
Wallet Security
Hardware Wallet Setup
- [ ] Use a hardware wallet for savings. Ledger or Trezor — pick one and actually use it. - [ ] Buy from official sources only. Never Amazon resellers, never secondhand. Tampered devices are real. - [ ] Write your seed phrase on metal. Paper burns. Flooding happens. A $20 metal seed plate survives both. - [ ] Store seed phrase offline. Never in a notes app, never in cloud storage, never in a screenshot. - [ ] Test recovery before loading funds. Reset the device, recover from seed, confirm it works. Then fund it.Hot Wallet Hygiene
- [ ] Separate trading and holding wallets. Your aping wallet should not hold your life savings. - [ ] Use a fresh wallet for sketchy interactions. Minting unknown NFTs? New DeFi protocol? Use a burner. - [ ] Check Rabby or Pocket Universe before signing. Transaction simulation shows you what you're actually approving.Approval Management
The Silent Killer
Token approvals are the #1 vector for wallet drains. When you approve a contract to spend your tokens, that approval lives forever unless you revoke it.- [ ] Audit approvals monthly. Use Revoke.cash or DeBank to see all active approvals. - [ ] Revoke unused approvals. If you used a DEX once 6 months ago, revoke its approval. - [ ] Use limited approvals when possible. Approve only the amount you're swapping, not unlimited.
Phishing Defense
- [ ] Bookmark your sites. Never Google "Uniswap" and click the first result. Phishing ads are rampant. - [ ] Verify URLs character by character. `uniswap.org` vs `unìswap.org` — can you spot the difference? - [ ] Never connect wallet to sites from DMs. No legitimate project will DM you a link. - [ ] Disable DMs from strangers on Discord and Telegram. - [ ] Treat airdrops as suspicious. Random tokens appearing in your wallet? Don't interact. Many are phishing lures.
Smart Contract Safety
- [ ] Check if contracts are verified. Unverified contracts on Etherscan/Solscan are red flags. - [ ] Look for audits. Tools like DeFiSafety and Certik track protocol audits. No audit ≠ automatic scam, but it's a risk factor. - [ ] Check TVL and age. New protocols with low TVL are higher risk. Battle-tested protocols (Aave, Uniswap) have been exploited and hardened. - [ ] Use security scanners. GoPlus, De.Fi Scanner, and Token Sniffer can flag honeypots and malicious contracts.
Operational Security
- [ ] Use a dedicated browser for crypto. No random extensions, no sketchy sites. - [ ] Enable 2FA everywhere. Authenticator app (not SMS). Google Authenticator, Authy, or 1Password. - [ ] Use unique passwords. Password manager is non-negotiable. One breach shouldn't compromise everything. - [ ] Be careful with screen sharing. Never share your screen with wallets open. QR codes and addresses can be captured. - [ ] VPN on public WiFi. Always. Non-negotiable.
Security Tools Worth Using
| Tool | What It Does | Price | |------|-------------|-------| | Revoke.cash | Audit and revoke token approvals | Free | | Rabby Wallet | Pre-transaction risk scanning | Free | | Pocket Universe | Transaction simulation Chrome extension | Free | | GoPlus | Token and contract security API | Free | | De.Fi Scanner | Smart contract vulnerability scanner | Free | | Blowfish | Transaction preview and threat detection | Free |
If You Get Compromised
1. Don't panic — act fast. Transfer remaining assets to a NEW wallet (not another wallet on the same seed phrase). 2. Revoke all approvals on the compromised wallet via Revoke.cash. 3. Never reuse the compromised wallet. Even after revoking approvals, the private key is exposed. 4. Document everything. You might need transaction hashes for law enforcement or insurance claims. 5. Report the scam. Chainabuse.com collects reports that help identify and track scammers.
The 80/20 of Crypto Security
If you do nothing else: 1. Hardware wallet for savings (prevents 90% of losses) 2. Revoke unused approvals monthly (prevents drain attacks) 3. Never click links from DMs (prevents phishing) 4. Separate trading and holding wallets (limits blast radius)
Four habits. That's it. The rest is bonus.
--- Security landscape changes fast. Follow @OnchainDeck for updated threat alerts and tool recommendations.