PMorgan Chase’s blockchain team has developed a privacy feature for ethereum-based blockchains, obscuring not only how much money is being sent but who is sending it. Revealed exclusively to CoinDesk, JPMorgan has built an extension to the Zether protocol, a fully decentralized, cryptographic protocol for confidential payments, compatible with ethereum and other smart contract platforms and designed to add a further layer of anonymity to transactions. The New York-based financial institution will open-source the extension Tuesday, and is likely to use it with Quorum, the bank’s homegrown, private version of ethereum. Zether, which was built by a group of academics and financial technology researchers including Dan Boneh from Stanford University, uses zero-knowledge proofs (ZKPs), a branch of mathematics which allows one party to prove knowledge of some secret value or information without conveying any detail about that secret. Explaining what the new extension does, Oli Harris, JPM’s head of Quorum and crypto-assets strategy, told CoinDesk:

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