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Before buying a presale token or claiming an airdrop, reach the project’s website through an independently verified official channel, check the full domain, and read every wallet request before signing. Never enter your recovery phrase on a website. Connecting a wallet is different from approving a contract to spend tokens—but an approval, especially an unlimited one, can put those tokens at risk.
How can I tell if a crypto presale website is real?
A polished page, familiar logo, or token name is not proof that a presale is genuine. Scammers can copy a project’s branding and use a lookalike URL; a token with the advertised name may also be unrelated to the project. MetaMask’s guidance on token presale scams recommends independently verifying the site and token details.
- Find the project’s official website or social channels without using the link in the presale message, ad, or search result you are checking. For example, use a known project account or an established source that you already trust.
- Compare the complete domain, including spelling and endings, with the domain linked from the project’s independently located official channels. A small change can send you to a different site.
- Check that the presale and token details are actually announced through those channels. Do not rely on a matching name, logo, or copied announcement alone.
- Before signing, inspect the wallet prompt for the site or app, contract or spender if shown, token, and amount. If the request does not match what you intended to do, stop.
Urgency, guaranteed returns, “free money,” or unusually high yields are reasons to pause and investigate—not reasons to hurry. Wallet security warnings can help, but they are informational: an alert may not catch every threat, and the absence of a warning or the presence of a verification badge does not prove a site is safe. MetaMask explains the limits of security alerts.
Is an unexpected token claim or airdrop link safe?
Treat an unsolicited claim link, message, social post, or unexpected token or NFT as untrusted until you verify it independently. A fake claim page may ask you to transfer funds, approve token spending, or sign something presented as a routine claim step. Instructions embedded in unsolicited token metadata are not proof of legitimacy.
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Never give a website or person your recovery phrase (also called a seed phrase). Whoever has it can control the wallet. Ethereum.org’s scam guidance puts it plainly: “Never enter your seed phrase on any website. Legitimate apps never ask for it.” To check a claimed airdrop, navigate to the project’s official channels independently and confirm that the claim is real and that the linked domain matches.
Can connecting my wallet drain it?
Connecting a wallet lets a site interact with the wallet interface; it is not the same thing as signing a transaction or granting token-spending permission. But a connection can lead to a prompt to sign, approve, or transfer. The important decision is what you are being asked to authorize. MetaMask describes the difference between connecting and granting token access in its guidance on fake voucher scams.
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What does token approval mean?
A token approval is permission for a smart contract—the spender—to move a particular token from your wallet, up to an allowance. It is separate from connecting to a site. If the allowance is unlimited, the contract may be able to move the full balance of that token, not just the amount needed for one purchase. A malicious site can disguise an approval as a claim, voucher, or presale step.
Read the wallet request rather than relying on the site’s description. Confirm whether it is a connection, transaction, approval, or signature, and check the token, spender or contract, and allowance where the wallet displays them. Prefer the smallest allowance that will complete the action. If you cannot tell what the request authorizes, reject it; a legitimate-looking page is not a reason to sign an unclear prompt.
How do I check and revoke token approvals?
Use an approval checker for the relevant network and inspect the spender and allowance. An Ethereum network view will not show approvals on another chain, so check each network where you may have granted access. Ethereum.org’s guide to revoking smart-contract access lists examples of approval tools, including Revoke.cash, Blockscout, and Etherscan’s Token Approval Checker. These examples are not a guarantee that any site is safe: navigate to a tool’s authentic domain before using it.
- Select the correct network in the checker.
- Review the listed spenders and allowances. Revoke permissions that are no longer needed or that appear suspicious.
- Approve the revocation transaction in your wallet only after checking its details. Revoking is an on-chain transaction and costs a network fee.
- After the transaction is confirmed, check the approval list again to verify the allowance changed as intended.
Disconnecting a site from your wallet does not revoke a token allowance. The two actions address different things: disconnection ends the app connection, while revocation changes the on-chain permission.
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What should I do after signing a suspicious request?
First, do not sign any further prompts from the suspicious site or people contacting you about it. If you suspect the wallet is compromised, prioritize assets that remain and treat the situation as urgent:
- If the recovery phrase may have been exposed: create a new wallet with a recovery phrase that has not been shared, and move remaining assets there. Do not treat the old wallet as safe just because you revoked approvals; someone with its phrase can still control it.
- If a token approval may be malicious: use the relevant network’s approval checker to revoke it if possible, then verify the result. This may reduce ongoing exposure but cannot reverse funds already transferred.
- Secure related accounts: protect linked exchange accounts, change passwords, and enable two-factor authentication.
- Preserve evidence: save wallet addresses, transaction hashes, screenshots, and messages, then report the incident through appropriate official channels. Ethereum.org provides scam reporting and response guidance.
Ethereum.org states, “Once a transaction is confirmed on the blockchain, it is final.” Be wary of anyone who approaches you promising to recover funds for an upfront fee; that offer can be a second scam.
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