hf20 is hard fork 20 like we get updates on our facebook app, instagram app same with steemit its like after every hardfork rules are changes for the betterment of steemit community :) currently two days back we have gone through hard fork 19 next is hardfork 20 new rules will be there :)
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Oh ok! Interesting. So the rules for steem get redefined in each HF?
yup