Ycash forked off Zcash blockchain at block height 570,000 and is independent from both the Electric Coin Company and the Zcash Foundation
Source: https://cointelegraph.com/news/privacy-focused-coin-zcash-forks-into-new-blockchain-network-ycash
Privacy-Focused Coin Zcash Forks Into New Blockchain Network Ycash
July 19, 2019
CoinTelegraph