"There's currently a >51% attack going on on XVG which exploits a bug in retargeting in the XVG code.

Usually to successfully mine XVG blocks, every "next" block must be of a different algo.. so for example scrypt,then x17, then lyra etc.

Due to several bugs in the XVG code, you can exploit this feature by mining blocks with a spoofed timestamp. When you submit a mined block (as a malicious miner or pool) you simply
set a false timestamp to this block one hour ago and XVG will then "think" the last block mined on that algo was one hour ago.. Your next block, the subsequent block
will then have the correct time."



What several bugs enable this? How is this looked over. Is this a commonly applicable exploit or something unique to verge's code?