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Opera integrated az ETH wallet and Apple is trying to do something like that. I think KDE should do that too. That's it.

Many people often say that cryptocurrencies are "stored" in wallets, but this is technically incorrect. Funds are stored in the blockchain: a distributed, decentralized ledger, which is the basis of the cryptocurrency ecosystem. Wallets, in turn, contain important data that allow the user to access these funds directly inside the blockchain and, if properly managed, ensure their safe storage.
To work with cryptocurrencies, special software is usually required — this is a wallet program *link removed by moderator*

There are existing options for wallets. Why does it have to be a special "KDE wallet"?
Shouldn't a project like KDE concentrate on it's core and deliver a compact, working, robust product _not_ bloated by millions of half baken applications? Leave special things to special projects, I'd say.