This EIP increase privacy by allowing users to burn and re-mint ether.
This approach have two main benefits

• It's imposible for outside obsever to understand that user burned funds and entered mixer.
• Privacy poll is extimelly big - all unspent accounts
  To burn funds user sends ether to unspendable address. In our case Keccak(Keccak(nullifer, secret)).
  To withdraw user proofs in zk that address from whitch he witdraw have this form and belongs to ethereum state tree.