When your hardware wallet screen shows only a string of hexadecimal characters and you have no idea what the transaction actually does—that's called blind signing, one of the main ways Web3 assets get stolen. In the first quarter of 2026, signature phishing scams alone stole $6.27 million from 4,741 victims, a 207% increase from the previous quarter. If you encounter a blind signing request on an unfamiliar link or a newly launched project, don't confirm it—simply back out.
Step 1: Recognize the Typical Signs of Blind Signing
What to do: Determine whether the current signature request is a blind signing—meaning a transaction the hardware wallet cannot decode.
How to do it: After getting your hardware wallet, initiate a real transaction you intend to make and watch what appears on the hardware screen:
Case A (Readable transaction): The screen shows something like 'Send X ETH to address 0x...' or 'Approve unlimited USDC to contract 0x...'—this is Clear Signing. You can read and understand what you're authorizing before deciding to confirm. Ethereum officially started supporting the Clear Signing standard on May 12, 2026, and Ledger, Trezor, and MetaMask were the first to integrate it.
Case B (Blind signing): The screen shows 'Data Present', 'Contract interaction', a string of raw hexadecimal data like 0x095ea7b3..., or a hash you can't understand at all, with no readable function name, parameter amount, etc.—that's blind signing.
Done: You can clearly tell whether a request is a readable clear signing or a blind signing showing only raw data.
Step 2: Which Transaction Requests You Must Never Confirm When Blind Signing
What to do: If you see a blind signing request in the scenarios below, simply reject it—do not confirm.
How to do it: Check against these categories:
Unknown 'free claim' or 'airdrop' pages: Pages reached through community links, ads, or search engine results that suddenly pop up a signature request and the hardware screen shows blind signing—this is the most common attack method. Attackers trick you into signing a permit signature, granting unlimited approval and then draining your wallet.
Newly launched DeFi protocols or those with unverified contracts: If a protocol isn't in the ERC-7730 registry, the hardware wallet cannot decode its contract calls, so they appear as blind signing. Ledger maintains a public registry that, by April 2026, covered over 40 protocols, including Uniswap, Aave, OpenSea, Permit2, etc.—but protocols outside this registry will likely show as blind signing when you interact with them.
Requests that involve setApprovalForAll but display as blind signing: setApprovalForAll authorizes 'this address can transfer all NFTs in your wallet,' making it one of the riskiest operations. If this action shows as blind signing on your hardware screen, don't confirm.
Any transaction that asks you to temporarily enable blind signing to proceed: If a DApp or someone tells you 'turn on blind signing first to execute this transaction,' that's a major red flag. Legitimate use cases do exist (like interacting with a new contract not yet in the registry), but you should only do so after you've independently verified the source and contract address, never because someone requests it.
Common mistake: Many people think 'if the hardware wallet shows a confirmation prompt, it means it's safe.' In reality, the hardware only ensures the private key isn't leaked; it doesn't guarantee the content you're signing is harmless. Radiant Capital lost over $50 million in October 2024. Attackers used malware to tamper with signature data, and multisig participants confirmed a transferOwnership() call while blind signing, handing protocol control to the attacker.
High risk: Blind signing greatly increases the danger of man-in-the-middle (MITM) attacks. Malware can alter what's shown on your computer or phone while the hardware screen only displays an unreadable hash, so you can't spot anything wrong. In a previous attack on Safe multisig wallets, Ledger blind signing was a critical link in the exploit chain.
Step 3: Follow the "No Blind Signing" Safety Process
What to do: When you encounter a blind signing request, don't confirm—use an alternative method instead.
How to do it:
Option A (preferred): If you must interact with a protocol outside the registry, first use a test wallet (with no significant assets) to do a small test transaction, confirm the result matches your expectations, then proceed with your main wallet.
Option B: Temporarily enable blind signing, complete the target operation, and immediately turn it off. On Ledger: Open the Ethereum app on the device → press the right button to enter Settings → find Blind signing → toggle to Enabled; after the operation, switch back to Disabled right away.
Option C: Don't do it. If the project can't even have its contract signatures decoded, it's either too early-stage or something is wrong—wait until it appears on major wallets' clear signing support list before participating.
How to verify after execution: After confirming a transaction, check the details on a block explorer (Etherscan or BscScan). Make sure the actual result matches your intention—the amount sent, recipient address, approved spender, and allowance are all correct. If anything looks off (like approving an unknown spender), go to Revoke.cash immediately and revoke that approval.
