An electronic apparatus, a method for an electronic apparatus and an information processing system are provided. The electronic apparatus includes a processing circuit configured to: generate a request to be confirmed which is to be sent to other nodes in a network, the request to be confirmed including an electronic signature of the present node; acquire responses to the request to be confirmed which are from the other nodes, the response including an electronic signature of a corresponding node; and generate, based on the request to be confirmed, the acquired response and an existing block chain, a new block.