Hardware wallet maker Ledger issued updated guidance in July 2026 requiring a standard warning whenever a device cannot display transaction details clearly. The move comes as Coin Bureau's latest security update flags blind signing — the practice of approving opaque data — as one of the top threats to hardware wallet users.
What blind signing means for users
Blind signing lets users approve transactions without seeing the full details on their device. It's faster, but it carries real risk. Someone could authorize an unlimited token spend or send funds to the wrong contract without ever knowing. Clear signing, by contrast, converts raw calldata into human-readable intent on the screen. That lets users verify exactly what they're approving before they sign.
Good wallets already flag blind-signed actions and high-risk approvals. They force an explicit acknowledgment rather than a quick click-through. But blind signing persists — speed, compatibility, and user habit keep it alive. Some dApps still require it.
Ledger's new warning requirement
Under the July 2026 guidance, when a Ledger device can't render clear signing, a standard blind-signing warning must appear and be explicitly acknowledged. That's a shift from earlier practices where the warning could be more easily dismissed or hidden. The company is pushing for a baseline of user awareness, even if the transaction itself remains opaque.
Coin Bureau's July 2026 update lists malicious transaction signing and blind signing among the top hardware wallet threats. The report doesn't name specific incidents, but it underscores that the risk isn't theoretical. Users who sign blindly are trusting the dApp and the interface, not their own device.
The ERC-7730 standard
ERC-7730 is a standard that enables full on-device display of transaction details — but only when both the wallet and the dApp support it. That's a big if. Many popular dApps haven't adopted it, and not all wallets have either. Until the standard becomes widespread, blind signing will remain a common workaround.
Ledger's guidance doesn't mandate ERC-7730 support. It simply says: if the device can't show clear signing, show a warning. That's a stopgap, not a solution.
Practical steps to stay safe
Users can take matters into their own hands. Disabling blind signing in wallet settings is the first step. Cleaning up old token approvals — revoking permissions for contracts you no longer use — reduces exposure. Transaction simulation tools let you preview what a contract will do before you sign. And favoring dApps that support clear signing cuts the risk further.
None of these steps are foolproof. But together they make it harder for a malicious transaction to slip through. The question now is whether dApp developers will adopt ERC-7730 fast enough to make blind signing a relic.
