Have been unable to find any official gpg signatures or checksums posted for the new elementaryos-0.4-stable-amd64.20160909.iso file. I ran sha250sum on it with this result: 8195c2515f5f8cad147a3418a2be9481ce7e5c7d404c057c7ff5663dc11f6455 elementaryos-0.4-stable-amd64.20160909.iso
Hello sysfu, this is the correct SHA256 sum, you can find it here: https://elementary.io/de/docs/installation#installation