It gets encrypted with the passphrase you input and is stored locally in your browser. Since the site is basically entirely client-side, the risk is very minimal as servers are not communicated with while signing.
Is it "safe" or "safer" to put an nsec into the login on the self hosted app of the #Shopstr site? nostr:nprofile1qqs2xugc5jyguqkj36rk0syv4tmnkjdtmtperttl7x9rqjy3ustdcvcppemhxue69uhkummn9ekx7mp0qy2hwumn8ghj7am0deejucmpd3mxztnyv4mz7qg4waehxw309aex2mrp0yhxgctdw4eju6t09uzac8sd The bunker I paste from Amber doesn't seem to work.
Discussion
Will check out the bunker issue as well to get that resolved.