So, as a follow up. I suggest bitdice.me publish a weekly (anonymized) list of investors together with the invested amounts and their risk (kelly). That's what just-dice did.

Since the total amounts should add up to the invested amount on the website, and the amounts multiplied with the kelly percentages should add up to the bankroll edit: well, max payout to be exact.

That way each investor can check that their amount is in the list and the community can be reasonable sure that the accounting is done correctly.