Electric Coin Company (ECC), which launched and supports the development of privacy-coin Zcash recently published a paper called: Halo: Recursive Proof Composition without a Trusted Setup.
On Sept. 10, ECC announced in a blog post that engineer and cryptographer Sean Bowe had discovered a way of “creating practical, scalable and trustless cryptographic proving” techniques, which claims to end a 10-year-long pursuit by the cryptography communities. He called the solution Halo.