What if we have 31 tests and we make a block for 30 of them. Does this mean that the 31th student won't have his grade until 29 new tests come so we can validate his test + the others?
In other term, does we have to wait enough transaction to occur to apply them?
Correct. So whoever had the smallest transaction fee (or points to donate, in this case) would not be included in the block. In fact, if on the next day, there were 30 more tests that had a higher transaction fee, that test STILL would not be included! It is based on supply and demand- if your fee is low, you wait longer until there are less test to grade.
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