Unless that individual has been sent up in a rocket and truly observed earth from his/her own eyes, one does not truly know. It's all hearsay. Could all be a big lie. Or not. ;)
And the person going there only knows him/her self. They can't tell anybody because the person they tell to never knows if they are lying ;)
I'm learning about Genaro Network GNX https://coinmarketcap.com/currencies/genaro-network/ beside finding a valid blockchain I found something interesting about it. Its value haven't declined like other coins in Jan.