Onay

Sends each signing request to the local Onay app for a second, independent check before your wallet signs.

Onay is a local signing companion. It gives every transaction a second, independent check before your wallet signs it. This extension is the thin browser part. It watches the wallet provider on each page and, when a dapp asks the wallet to sign (a transaction, a message, or typed data), sends a copy of the request to the Onay desktop app on the same computer. The wallet receives the request unchanged and at the same time. The extension never holds keys, never changes a request, and never blocks the wallet. The app does the work: it reads the contract code as verified chain state, checks the source code against Sourcify, decodes the call, simulates it, and shows you what you are about to sign. You compare the digest with what your wallet shows and decide. You need the Onay app for this extension to do anything. Get it at https://sourcify.dev. Onay is free software (GPL-3.0) by the Sourcify team.