Sign with a browser extension¶

Check for a NIP-07 extension before asking the user to sign. Their private key stays in the extension, which handles the approval prompt:

NostrSigner signer = new NostrNIP07Signer();

if (!signer.isAvailable().await()) {
    throw new IllegalStateException("No NIP-07 extension available");
}

NostrPublicKey me = signer.getPublicKey().await();
SignedNostrEvent event = signer.sign(unsigned).await();

You can also request NIP-04 or NIP-44 encryption if the extension supports it. Handle a rejected task even after a successful availability check: the user may refuse, or the requested method may be unavailable.

Use this signer in the browser. For other environments, or users without an extension, offer one of the other signing options.