Reliable credentials for FX investors

Hi,
I’d like to ask you (the community) this question:

-If you were looking to invest in a trader what proof of his track record would you consider legitimate?
*FX BOOK…?
*Broker accounts?
*Trading experience?

I’d rally like to know as I’d like to display real proof to potential investors…but what does this look like? that will leave no shadow of doubt?

Thanks in advance.
Hugh

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