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RE: Steem Proposals UI now supports Steemit Testnet SPS system
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.
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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.
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