The Tool Desk
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What should you do first after a suspected DeFi hack?
Stop interacting with suspicious sites
Do not revisit a suspected phishing page or respond to unsolicited messages claiming to be wallet or protocol support. Never share your seed phrase or private key. Verify website addresses independently; a fake page can closely imitate a legitimate wallet, exchange, or DeFi interface. Keep records of what you saw and did.
Protect assets if your key may be exposed
If your seed phrase, private key, or wallet software may have been compromised, move remaining assets to a new wallet with credentials and a signing environment the suspected attacker cannot access. Verify the destination address carefully and use a procedure appropriate to your wallet and chain. Ethereum.org’s scam response guidance also advises changing passwords on linked exchange accounts and enabling two-factor authentication.
A compromised protocol or website does not by itself prove that your private key was stolen. A token approval gives a contract permission to spend specified tokens; a compromised key can give an attacker broader control of the wallet. These are different risks, and the remedy for one does not resolve the other.
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How do you revoke token approvals?
Check allowances, not just wallet connections
Disconnecting a wallet from a dapp only ends its connection to that interface. It does not necessarily remove an on-chain token allowance previously granted to a contract. An allowance, including an unlimited one, can persist after you leave a site or withdraw from a protocol.
Ethereum.org names Revoke.cash, Revokescout, and Etherscan’s Token Approval Checker on its response page. Its approval-revocation guide also lists Etherscan, Blockscout, Revoke, Unrekt, and EverRevoke. These are examples, not endorsements or guarantees. Navigate to a tool independently, check that you have the correct domain, and do not provide your seed phrase or private key.
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Repeat the check on each network
- Select the relevant network. In your wallet and the approval checker, select the chain where the token and allowance exist. An Ethereum Mainnet view will not show approvals on Polygon or another network.
- Review the allowance. Check the token, contract, and permission shown. If you do not recognize an approval, investigate it carefully before signing a transaction.
- Submit a revoke transaction. Revoking is an on-chain transaction and requires that network’s fee. Do not assume the permission has been removed merely because you clicked a button.
- Verify the result. After the transaction confirms, refresh the checker and confirm that the allowance is gone. Repeat for each network where you interacted with contracts.
Revocation prevents that allowance from being used going forward if the transaction succeeds; it cannot recover tokens already transferred, and it cannot neutralize an attacker who has your private key. You may need to grant a new allowance the next time you use that contract.
What evidence should you save?
Make a short timeline while details are fresh. Save the information you have, even if you cannot identify every transaction:
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- Your wallet address and any recipient or suspicious addresses.
- Transaction hashes or IDs, asset types, amounts, and dates and times.
- Screenshots and copies of messages, including email addresses, phone numbers, social accounts, and names used.
- Websites, domains, apps, dapps, exchanges, and other services involved.
- What happened before and after each suspicious transaction, including any links opened or approvals signed.
The FBI’s cryptocurrency-victim guidance specifically requests transaction details such as addresses, amount and cryptocurrency type, date and time, and transaction ID or hash, along with communications, scammer identifiers, domains or apps, exchanges, and a timeline. The FBI says to report even if transaction information is unavailable.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Where should you report a crypto theft?
Use the official channel for your jurisdiction
For victims in the United States, the FBI points to the Internet Crime Complaint Center (IC3) and a local FBI field office. Ethereum.org lists Action Fraud for the UK, Europol for the EU, and local police elsewhere. These are jurisdictional examples, not a substitute for checking the official reporting route where you live.
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Ethereum.org also suggests reporting scam addresses to Chainabuse and Etherscan, and malicious websites to phishing databases or browsers. Use the reporting options available on those services, and preserve your evidence.
Contact an exchange if funds reached one
If you can trace funds to a centralized exchange, contact its official support promptly and provide the transaction details. Ethereum.org notes that an exchange may sometimes freeze an account flagged for fraud; it is not guaranteed to do so.
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Can stolen crypto be recovered?
Confirmed blockchain transactions are generally final; a help desk or recovery service cannot reverse them. As ethereum.org puts it, “No one can reverse blockchain transactions.” Reporting can help warn other users and support investigations, but it does not promise that funds will be returned. The FBI notes that public blockchains can let investigators trace fund flows, while cross-border transfers can make investigations challenging.
Be wary of anyone who contacts you after a theft and demands an upfront fee to recover funds, reverse a transfer, or unlock a wallet. Ethereum.org and the FBI both warn about follow-up recovery scams. Do not give such a person your seed phrase, private key, or remote access to your device.
What if a connected account was compromised too?
A wallet approval and permission granted to a connected online account are separate things. If you suspect an email, social, or other online account was exposed through an app connection, review that service’s own security settings and remove unfamiliar connected apps or tokens there. That does not revoke blockchain token allowances; check those on the relevant networks separately.
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