Stealthcoin (XST) has been rebranded to Stealth (XST): https://twitter.com/stealthsend/status/993226001101545473 Stealthcoin provides a complete anonymity solution for cryptocurrencies. Stealthcoin has a fair distribution with nearly four hours of low block rewards, a small premine of 1%, and the long-term energy efficiency of proof-of-stake minting.
YGGDRASH is a trust-based multi-dimensional blockchains (branches) built with a vision “Digitize everything into reality” and to connect everything and any blockchain networks. YGGDRASH’s main-net is called STEM, and its cryptocurrency is YEED. It is a trust-based blockchain ecosystem where each branch is governed by reputation to ensure integrity.