I'm making a block chain viewer, and have been working on a script that imports the block chain into a database as well as performing some calculations on the data. One calculation I perform is determining the chain that the block belongs to - if it's the main chain, a side chain, or a fork (orphan chain).

As the script ran I noticed that at block 15031, the chain starts to generate many side chains. It seemed that on average after block 15031 about every 5-10 blocks a new side chain was being generated. If my script is accurate, then that means that junk data is being filled into the block data file - signifying an attack?

Please see my gist. If my code is accurate, I believe that there is something/someone specifically targetting Dogecoin to make current clients fill their block files with junk data