That's impossible, you have to invest it in a bank account, or something like premium bonds, both of which are less risky than the keep it in a mattress option.
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Blockchain technology absolutely has a chance of replacing a server based database in every way in the future, there is a university in Africa already using the Cardano blockchain to register the identity of their students, this could expand to finance/credit and governance. Then there are NFT's that are unique tokens registered to a blockchain that can be used against real world property or goods to authenticate ownership or legitimacy, right now they are mostly being used against digital art, but to think that's all they will ever be is very short sighted. Crypto currency itself is one thing, but it's the newer, more refined blockchains behind them that really have my excitement and belief for the future. It has the potential to give countries that are locked out of traditional banking system financial freedom, and they will actually end up more technologically advanced in those fields due to them side stepping the old legacy databases current developed countries use, they will be going straight into trustless decentralized blockchains from the start, this technology will also be good at ensuring corruption in these industries will be kept to a minimum.