In 2020, I was able to edit 8-days-old posts on Hive.blog and that appeared to have failed to work as of today, as of some minutes ago, last time I checked. I'm going to assume a fork, a softfork or hardfork, removed that ability.
Epic Rap Battles of History: Trump vs Biden
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Do not miss the last post from @hivebuzz:
You may need to use your active key.
A quick update, I was later able to edit an older post. I don't exactly know how but according to what folks said on Discord servers, the problem was partly due to bugs in I think the Hive blockchain itself and/or at least just the Hive Blog application which rests on top of the blockchain. If I run into it again, I'll take your advice and try my active key. I also tried changing my node a few times but I don't think that changed it. But the good news is the problem is probably fixed now.
I have just edited an old post using only my posting key. I think your response to my last comment is right on the money. About a week ago I couldn't post anything at all on Peakd or Hive.blog. While I was investigating whether it was the PeakD/SteemPeak software or the hive blockchain it seemed to right itself.