Minimum
- Symbol, order type, requested price, filled price.
- Time with timezone, ideally from the platform's history.
- Account type (raw, standard, etc.).
- A screenshot of the history or journal line, not only the chart.
- The chart at the same timestamp, with M1 candles, so others can see the market at that moment.
- Bid and ask, not just the bid line. Many "stop hunts" are simply the ask touching a buy stop.
- A comparison with another feed at the same second.
- A pattern over many trades, not one dramatic case.
I'd also suggest replies challenge the evidence, not the person. "Your chart is bid-only, can you show the ask?" helps more than "you're just a bad trader".
Would anyone object to these as a forum standard? Things to add?