Why is it that every 5 puzzles from puzzle 135 onwards, one puzzle has its public key revealed, while the surrounding puzzles do not?
because there were transactions with them, whoever created the puzzle specifically revealed their public key.
everyone knows that there must be a spending transaction to reveal the public key but from question 135 onwards all the questions are difficult and reveal the public key for the puzzles where the prefix starts with 4 and ends with 7, why don't they reveal the public key for puzzles of equal difficulty