https://github.com/duc-le/ctf-writeups/blob/master/2016_EKOPARTY_CTF/writeup.md

or

https://piggybird.net/2016/10/ekoparty-2016-write-up-the-fake-satoshi-misc-300/

Original writeup (https://github.com/duc-le/ctf-writeups/blob/master/2016_EKOPARTY_CTF/writeup.md).