I heard something about from Blockchain bank alike deposits based on XDN proof-of-work blockchain digitalnote.org Values: 150XDN - minimum deposit amount 11000 blocks ~1 month - minimum deposit time 11000*12*10 blocks ~10 years - maximum deposit time Annual interest rate 0.4% - 1.094%
and Blockchain deposits on Ethereum smart contracts provided by socialcloudbank.com they interest rates are much higher.