Does this report belong to this code?
Every Quantgrounds report prints a code fingerprint and a replay code. Paste the strategy code to check the fingerprint in your browser, then re-run it with the replay code to check the score. No keys or accounts: the run either reproduces or it doesn't.
What a match proves
The fingerprint shows the report was made for exactly this code: changing a single character produces a different one. Runs are deterministic, so re-running the code with the replay code (the random-shard seed, or the assets, dates and cost) gives the same score. If the score matches, the report's headline is real for this code; an edited score or a different strategy won't reproduce.
What it can't prove
It doesn't show who wrote the code, or that it wasn't copied from someone else. It also says nothing about future results. A report made by an older engine version may not reproduce exactly if the engine or data has changed since; the report prints the engine version it used.