It is so strange. 10 mins ago, I could not reply to your last comment. And I tried again to post . Noting. the same message. Then, I have changed the tag from what I wanted: technology space . Noting.
Then I have deleted everything, cleared cache, deleted the post title, content, tag, rebooted the laptop and I managed to write a post. I have put the letter "a" in title, blog post and tag. It worked. I have then tried to edit that post and write my post. Noting.
AaRRGhhh.
Then, without deleting the post, I have changed the tag to introduceyourself and it worked.
So this is what I was trying to post for the last 3 hours:
https://steemit.com/introduceyourself/@gabi-dumitriu/quantum-coin-mixing-crypto-and-quantum