Abstract: Embodiments disclosed herein may relate to systems and methods for secure authentication that enable a user to set up an account or log in an existing account upon an existing user vouching for the user. Embodiments disclosed herein relate to verifying one or more attributes of the user by transmitting multiple decentralized verification notifications to multiple existing users. Upon receiving a verification quorum, a request may be authenticated.

Abstract: The invention relates to a pneumatic tool with a handle (26), valve (22), a safety switch lever (18) arranged on the handle (26) for actuating the valve (22) and a pressure medium connection (16), wherein the valve (22) comprises a valve body (28) movable between a home position and at least one further position, wherein a connection between the pressure medium connection (16) and a pressure cylinder (12) of the tool is interrupted in the home position and the connection between the pressure medium connection (16) and the pressure cylinder (12) of the tool is established in the further position. It is proposed that the pressure cylinder (12) is vented with the displacement of the valve body (28) to the home position and a pressure applied to the pressure medium connection (16) displaces the valve body (28) toward the home position when the safety switch lever (18) is released.