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.
LINKA is a “value linking platform” that enables everyone to use cryptocurrency, credit card, and other payment methods without any restrictions both in the real world and crypto space by providing inter-usability of value through promoting value circulation.