The future is very unpredictable when it comes to cryptocurrencies and the next big improvement. Some Altcoins use similar concepts but for different goals, for example, Ethereum embedded smart contracts which can run dapps, but Steem chose to embed Proof-of-Brain containing algorithms. Nonetheless, each new cryptocurrency adds its own innovative idea, improving on what has already been done, and keep in mind that this evolution happened in only a decade.
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From @abdulfattah