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And hf21 means this.
It is a group of 21 witnesses and hf stands for hard fork.

If I understood correctly, it's the situation where a change, the hard fork, is made to the original code in block chain.

Posted using Partiko Android

Yeah. You might think of hard forks like an update in a software product, that's it. Witnesses do need to approve it in order to make it live.

Hey, I wrote this article tonight.

I'm asking you if you would like to play a game with me?
Read about it here.

https://partiko.app/mr72bussi/dmitrydao-would-you-be-interested-in-a-word-battle-with-me-lzh2hx08?referrer=mr72bussi

Posted using Partiko Android

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