The two projects Stone and Manta are belong to one (or a group of) people. They promise to give coins via Faucet, but it's just a bait to receive donation from investors. Many questions and red flags were addressed by hero and legendary members, but all of them were deleted. The two topics are self-moderated.

In the past I found many red flags in Sentry project and a short time later it turned out to be a scam. This time, you have been warned.