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.
Boom Token is a social experiment. Blockchain gives us an opportunity to create this deflationary currency, and the deflation mechanism is fully based on smart contract. The basic rules are as below: There were originally 1,000,000,000 Boom in existence. Each on-chain Boom transaction completed, 1% of the transaction amount burned. There will never be newly minted Boom.