A phishing campaign reported in November 2024 impersonated OpenSea with emails claiming recipients had received offers on their NFTs. The emails led to counterfeit marketplace pages that asked users to connect a wallet, scan a QR code or enter login details. Treat an unsolicited offer email as suspicious: open opensea.io yourself and check there instead of following the message’s link.
What happened in the reported OpenSea phishing campaign?
Candid Technology reported the campaign on November 26, 2024, with an update on December 1. The emails imitated OpenSea notifications and claimed someone had made an offer on an NFT listed by the recipient. One reported sender address was [email protected], which is not an OpenSea domain.
The message used OpenSea-like branding and an urgent “Access Now” button. That button led to a counterfeit site displaying a fabricated offer and prompts to connect a wallet, interact with a QR code or log in. The reported aim was to capture credentials or persuade users to authorize a wallet interaction. The report does not establish how many people were targeted or compromised, whether funds were stolen, or who was behind the campaign. It describes impersonation and phishing, not a confirmed breach of OpenSea’s systems.
This is a historical report, not evidence that the same campaign is active now. The pattern remains relevant: OpenSea’s safety materials warn about fake offer notifications and imitation sites among recurring web3 scams.
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How can you check whether an OpenSea offer email is genuine?
OpenSea says legitimate emails come from the opensea.io domain. Its guidance also lists [email protected] as an address that may reply to a Help Center request. Check the full sender address rather than relying on the display name, which can be made to look familiar.
- Look for OpenSea’s stated email indicators: a verified blue checkmark in Gmail or a “Digitally Certified” mark in Apple Mail. Treat these as clues, not a reason to follow a suspicious link.
- Be wary of unrelated domains, misspellings, lookalike domains, free-mail addresses, attachments and unexpected requests to sign a wallet transaction.
- Do not judge a site by its logo or HTTPS padlock. Neither proves the site belongs to OpenSea.
- Open a fresh browser tab, type
https://opensea.ioyourself, and check the relevant account activity or offer there. - Never enter a seed phrase or private key on a page reached from an email. OpenSea says it will not ask for a seed phrase, password or private key, or ask you to send funds to fix a sale or transaction problem.
OpenSea’s phishing-reporting guidance and overview of common web3 scams explain its warning signs. A real-looking notification is not proof that the offer is real; verify it independently in your account.
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What does connecting a wallet actually authorize?
A wallet pop-up is a request from a site, not a security endorsement of that site. The risk depends on what you approve or disclose next. In particular, connecting, signing and granting spending permission are different actions:
- Wallet connection: Lets a site request information associated with an address and ask the wallet to perform further actions. A connection alone is not the same as handing over a recovery phrase or authorizing a transfer.
- Message signature: Confirms control of an address in some workflows, but a signature can still be abused. Do not sign a request whose purpose you do not understand.
- Transaction: May move assets or perform another on-chain action. Read the network and transaction details before approving.
- Token approval or allowance: Gives a contract permission to access specified token types or amounts. OpenSea’s approval guidance covers ERC-20, ERC-721 and ERC-1155 permissions.
- Seed phrase or private key disclosure: Gives someone the credentials needed to control the wallet. Treat disclosure as an emergency.
A hardware wallet can keep a key out of a browser, but it cannot make an unsafe signature or approval safe. OpenSea advises users not to sign a transaction prompted directly by an email and to check that the wallet request identifies https://opensea.io as the origin when they were directed there by email. Its safety guidance recommends going to the site directly.
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What should you do if you clicked the link?
If you only opened the page and did not download anything, enter information, connect a wallet or approve a request, close it and do not return to it. Clicking by itself does not establish that your wallet was compromised.
- Close the fraudulent page. Do not install a wallet extension or download a file it offers.
- Keep the email, full sender address, destination domain and screenshots if available. Do not forward the link to other people as a warning.
- If you downloaded or ran a file, use your device’s normal security tools to scan it. If you entered a password, change it through the genuine service using a clean browser session, and enable multifactor authentication where available.
- Report the message to your email provider and to OpenSea through its Help Center. OpenSea advises users to stop communicating with the sender and block them.
What if you connected a wallet, signed, or approved something?
Take action based on the request you actually accepted. Do not reconnect to the suspicious site to try to undo it, and do not trust an unsolicited person offering to recover your wallet.
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If you only connected
- Use your wallet’s connected-sites controls to disconnect the suspicious site.
- Review recent activity on the relevant blockchain explorer and inspect permissions for unfamiliar contracts.
- Understand that disconnecting stops the site from using that connection going forward, but does not necessarily revoke token permissions you may already have granted.
If you signed a message or approved a transaction
- Inspect the wallet activity and the exact network, contract and action. If you granted an unfamiliar token approval, revoke it using a reputable approval-management service for that network.
- OpenSea documents an Ethereum route using Etherscan’s Token Approval Checker: connect the wallet, inspect the ERC-20, ERC-721 and ERC-1155 tabs, select an unfamiliar approval and choose Revoke. Confirm the network and transaction details before signing. Etherscan is a third-party service.
- Revocations require a network gas fee. A revoked NFT allowance may also mean NFTs can no longer be bought, sold or transferred through OpenSea services until approval is granted again.
- Consider moving remaining assets to a clean wallet if there is evidence that signing authority or the wallet key was exposed. Do not send assets to an address supplied by a scammer or an unsolicited “support” contact.
If you entered a recovery phrase or private key
Assume the wallet is fully compromised; changing an account password does not change an exposed blockchain key. On a clean device or verified wallet application, create a new wallet and transfer remaining assets as soon as it is safe to do so. Never reuse the exposed phrase. Contact any exchange or custodian involved if funds were moved, and report the theft to the appropriate law-enforcement channel.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What revoking an approval can—and cannot—do
Revoking an approval removes that contract’s authorization for future use of the permission. It does not reverse a completed transfer, recover stolen assets or repair a leaked seed phrase or private key. It may not cover permissions on another network or a separate authorization, so check the relevant token standards and chains rather than assuming one revocation clears everything. Each revocation is an on-chain transaction and can cost a gas fee.
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OpenSea’s Ethereum approval instructions describe the supported approval types and note the fee. Treat the wallet’s revocation prompt like any other transaction: verify the network and details before signing.
How to report an impersonation—and what OpenSea support will not ask for
Use OpenSea’s Help Center Messenger to report suspicious emails, direct messages or imitation websites. OpenSea says it will not initiate a social-media direct message, request your seed phrase, password or private key, or require you to send ETH or another token to resolve a failed sale or transaction. It also says it does not control funds or NFTs held in a user’s self-custodial wallet.
Report the message to the email provider as well. If assets were stolen, preserve transaction details and contact any relevant exchange or custodian; do not pay someone claiming they can reverse a completed blockchain transfer.
Unexpected NFTs are not proof that your wallet was hacked
Anyone can send an asset to a wallet. OpenSea says some suspicious NFTs or tokens may appear in hidden status on a profile. An unexpected item alone does not establish that your wallet is compromised; avoid following links or instructions embedded in its name, description or associated messages. See OpenSea’s explanation of hidden NFTs and tokens.
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