# Plasma EVM change logs #### [1.0](https://hackmd.io/s/SkoSGtXOm) First version of Plasma EVM. It can't prevent block withholding attack. #### [2.0](https://hackmd.io/s/BkHtXjSQ4) [User-activated Fork](https://hackmd.io/s/ByeGtM5D7) enables users to make a fork if they notices the block withholding attack. It requires significant finantial and time cost. User can safely exit their assets and states by forking the chain. #### [2.1](https://hackmd.io/s/HyZ2ms8EX) - [User-activated Fork](https://hackmd.io/s/ByeGtM5D7) paper is fully merged into this paper - Various cases in submitting URB is added - Challenge case for URB is added - Minimum point of cost functions for URB, ERU is modified - Issues related with UAF model are added
Last changed by  
 
Aiden Park
780
Published on HackMD