Read more on : https://github.com/bitcoinzero/doc/blob/master/bitcoinzero.pdf

In short, Bitcoin Zero is designed to bring zk-SNARK back to Bitcoin.
The journey of zero started from
zerocoin (Miers et al., 2013) a cryptographic extension to Bitcoin including utilizing non-interactive zero-knowledge proofs;
Then, zerocash (Sasson et al., 2014) formulated and constructed decentralized anonymous payment schemes.
After a few technical modification https://github.com/zcash/zips/raw/master/protocol/protocol.pdf,
Zcash as an implementation of zerocash has finally been available for general use.
Now that zk-SNARK is widely accepted, Ethereum for example, users of Bitcoin may want to enjoy the same protection too.
So, here comes the Bitcoin Zero. To achieve such a goal, addition to zk-SNARK,
I intended to implement a chainstate snapshot and
a merged mining PoW, which will be explained later.
Here I want to convey my respect to all the good work mentioned before.
As a gesture, I will honor the founder reward of Zcash in Bitcoin Zero.