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Mid-thought: you don’t need to be paranoid to stay safe, but you do need a workflow. Really. There are a handful of practical checks that separate “I’ve been burned” from “I sleep fine.” Short version: reduce blast radius, verify intent, and never blindly approve what you don’t understand.
I work in DeFi every day, so this isn’t theory for me—it’s habit. At the core, wallet security is about three things: key custody, intent verification, and pre-flight checks. Each part has tools we can lean on. WalletConnect and transaction simulation sit squarely in the “intent verification” and “pre-flight” categories, respectively. They help you answer the simple question: is this transaction doing what the dapp claims it is?

WalletConnect changed the UX game by letting wallets sign transactions from mobile dapps without exposing private keys. That convenience comes with a couple of gotchas. WalletConnect acts as a bridge: it relays JSON-RPC requests between a dapp and your wallet, and if a session is hijacked or a relayer is malicious, things can go sideways.
So here’s a practical checklist when you use WalletConnect:
And yes—pairing with a hardware wallet through WalletConnect is a game-changer. It adds a protection layer: even if a malicious dapp asks your wallet to sign a transaction, the device prompts you and shows critical details. Don’t skip that step if you’re moving significant amounts.
Okay — check this out—transaction simulation is low-effort but high-value. Simulate before you sign. Period. It tells you if a call will revert, what state changes would occur, and whether an approval is suspiciously wide. My instinct says this is common sense, but too many people still skip it.
What to simulate and why:
How to read a simulation result: focus on the “what changes” view. If you see an allowance set to max for a token you don’t plan to trade often, that’s suspicious. If value is being passed to a contract you didn’t expect, pause. The less obfuscated the function selector and input, the better — trusted wallets decode the ABI to show human-readable method names and arguments.
Tools and integrations: many wallets perform local eth_call simulations or use third-party services to run full state traces. A modern wallet that integrates simulation into the signing flow reduces mistakes—if the wallet shows a clean simulation with clear diffs, you can proceed with confidence. If not, dig in or reject.
Here’s the pattern I follow for any non-trivial transaction:
I’ll be blunt: allowance creep is the most overlooked vulnerability. Approving max allowances is convenient, but it hands a contract permission to drain tokens if the contract or its admins are malicious. Use per-amount approvals, and when a dapp pushes you to “approve all”, think twice.
Not all wallets are equal. Look for these features in your wallet of choice:
If you want to test a wallet that emphasizes those exact features, check out the rabby wallet official site for a clear overview and documentation on their approach to transaction simulation and WalletConnect handling. It’s one resource I point people to when they ask for a balance between security and UX.
A: Yes, if you pair via a malicious QR or a compromised relayer is used. Mitigations: verify the dapp origin, limit session lifetime, and use relayers/wallets you trust. Hardware confirmations add another safety net.
A: Simulations run against current chain state, so off-chain or oracle-manipulation risks that happen after you sign may not be visible. Also, some complex cross-chain or meta-transaction flows can behave differently on mainnet under congestion or unusual mempool ordering.
A: No. Minimizing allowance and revoking unused approvals is best practice. For high-trust contracts you interact with frequently, consider setting controlled allowances rather than unlimited ones.
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