Zether is the first intelligent contract scheme based on account model in Ethereum, which provides confidentiality (hiding transaction amount) and anonymity (sender and receiver addresses). Proposed on 20 19.

Zezer is implemented by ZSC (Zezer Smart Contract) and ZTH (Zezer Token). Zether can be regarded as a smart contract ZSC deployed on the Ethereum. The token is ZTH, and the address is elgar Mal's public key.

At present, existing anonymous payment schemes, such as Zcash and Monero, all use UTXO model and homomorphic promise to hide the amount in the transaction. Zether uses a variant of Elgamal to encrypt and attach certificates to ensure the validity of the transaction.

If Alice wants to interact with Zether, she first needs to create an Elgamal key pair and start a transaction to save some ether. Then, ZSC creates an account with a balance of ZTH of the deposit amount. After that, Alice can secretly send ZTH to other Zezer accounts. In order to hide Alice's accounts, Alice chooses some Zezer accounts as anonymous sets, and others can only see one account in the anonymous set transferring money. Alice can also convert her ZTH into ether.

Zether's idea is relatively simple. See the Resources for more details.

/@ loveshhachandani/notes-on-zether-forward-privacy-in-a-smart-contract-world-6c 4333 f 975d

https://crypto.stanford.edu/~buenz/papers/zether.pdf

https://ethresear . ch/t/zether-the-first-privacy-mechanism-designed-for-ether eum/5029