Start with the claim
A backtest is one conditional measurement. Before looking at a return, ask which universe was available at the time, when the signal was knowable and how an order could have filled. These notes explain the research contracts used in QuantProp.
What is available today
The library now contains original Stockback and Coinback historical experiment records, methodology, tool documentation and a separately labelled synthetic execution-cost demonstration. Archive records retain their old assumptions and corrections; migration is not a new reproduction or a fresh independent test.
What stays private
Tradeable candidates, model parameters, symbol-level orders and discovery-specific diagnostics stay in the private research workspace. Public education is not a live signal service.