Your wallet address is the same on every EVM chain. Your approvals are not. Every time you bridge to a new chain and interact with a dApp, you create a new set of token approvals on that chain — independent of every other chain, managed by different contracts, with different risk profiles. One wallet, 27 potential attack surfaces.
The Sprawl Problem
Most DeFi users start on Ethereum mainnet. Then they bridge to Arbitrum for cheaper gas. Then Base because a friend told them about a new DEX. Then Polygon for an NFT mint. Then Optimism because a protocol they use launched there. Each interaction leaves behind approvals. After a year, a moderately active user has approvals on 4–8 chains — most of which they’ve forgotten about.
The approvals on each chain are completely independent. Revoking an approval on Ethereum does nothing to the same spender’s approval on Arbitrum. A compromised contract on Base doesn’t affect Polygon. But a compromised contract on Base that has your approval on Base can drain your tokens on Base — and you might not even know you had tokens there.
Why Single-Chain Tools Fail
A security tool that only scans one chain at a time creates a false sense of security. You scan Ethereum, see a clean report, and feel safe. Meanwhile, you have unlimited approvals to three unverified contracts on Arbitrum, a stale approval on Polygon from a protocol that was exploited last month, and tokens sitting in a bridge contract on Base that you forgot to revoke.
Multi-chain security requires multi-chain scanning. Not “select a network from this dropdown.” All networks, scanned in parallel, scored together, presented in one view.
The Cross-Chain Risk Multiplier
Approval risk multiplies across chains because:
- Attention is finite. You can’t manually audit 8 chains monthly. You’ll do one or two and neglect the rest.
- Protocols fork across chains. The same contract code deployed on 5 chains means a vulnerability affects all 5.
- Bridge approvals are the most dangerous. They’re high-value targets, and they exist on the source chain where your tokens originated.
- Gas costs vary. Revoking on mainnet costs $5–15. On L2s it costs $0.01–0.05. Users delay mainnet revocations because of cost, leaving the highest-value approvals active the longest.
What to Do
- Scan every chain. Use a tool that covers all the networks you’ve ever touched — not just the ones you remember.
- Start with L2 revocations. They’re nearly free. Clean up Arbitrum, Base, Optimism, and Polygon first. Then address mainnet.
- Audit bridge approvals specifically. These are your highest-risk, highest-value approvals. Revoke them after every bridge transfer.
- Set up cross-chain monitoring. Get alerts when new high-risk approvals appear on any chain — not just the one you’re thinking about.