Yes, this is a Ponzi! Don't invest a single penny in it. It is by far to good to be true!
A lending platform with up to 43% interest per month. Locked capital for a period of time depending on the amount of money you pay. The ability to stake coins for even more "income". And as if that wouldn't be enough a referral program.
That are all red flags. It's actually the same as bitconnect.
Just as a quick math example how unrealistic this is. Let's say you put in $10.000 for 2 years. On a bank account you'll earn probably 0,02% interest (about $4). Stocks will give you about 5 - 10% (about $1025 - $2100). Bitcoin gave you the last 2 years over 2500%, which is already more than insane. This would've made your $10.000 into $250.000. And what dows ThornCoin say: Up to 43% per month. Let's calculate with the maximum 43%:
with $10.000; 43$ interest; 24 months
$10.000 * (1,43^24) = $53.464.425
This is not possible! Never! Ever! No!