No question at all
May 20, 2019. The author promises a block "so simple and obvious that I don't even need a question". Block 11 of the first run did the same trick, so there's a hint in the number itself.
What you get is a format, [solution] TOMI [TOMI], and the first digits of three MD5 hashes: 057 for the whole string, 7 for the solution, 1 for the TOMI field. That's it. No question, no link.
u/Quantris put it well: "IMHO no block with a TOMI could really be considered straightforward". The guesses piled up anyway. "a very simple solution", "block 11", "geico TOMI caveman". Nothing.
Close to nothing
The claim confirmed at 11:21:51 UTC on May 21, and nobody said a word. The author's update explains it. Start from nothing, and the two smallest things you can type are one space and one line break. The solution was one space. The TOMI field was one space.
So the string starts with two spaces. One is the solution, one comes before TOMI. u/BrainForceOne hashed TOMI one space first, missed, and then got it. Feels almost rude, doesn't it?
The hint that never came was 4444. The author explained it later: 4 for 44, divide by 4. Block 44 of the first run had a blank solution, and this one was "close to blank".
Bots or people?
The silent winner made the author wonder whether an outside bot had grabbed the 7 mBTC. u/Quantris didn't buy it: MD5 into Ian Coleman's tool is enough protection on its own. One way to find out, the author said. That test became block 15.