How do you get people to trust your data when you have zero track record?

Been thinking about this a lot for anything where the core pitch depends on numbers - finance, health, fitness, anything with metrics attached.

You can publish real data, real logs, whatever proof exists - but a brand-new account with no history saying "trust me, the numbers are real" is exactly what a scam would also say. The data being genuinely real doesn't automatically solve that problem.

For anyone who's launched something like this - how did you actually get people to believe you early on? Public/verifiable data, third-party validation, just time and reputation compounding, something else entirely? Genuinely curious what's actually worked for people here versus what sounds good in theory.