Agreed that direct conversation is the only good approach.

But I also want to mention: have their been any actual outcomes from this project, or is the board just "excited about it"? Has there been revenue realized? If you ask for "credit" before there is real outcomes, you are basically asking for the boss to name drop you to their boss. While that's not _egregious_, personally I would wait until there are business outcomes as collateral to ask for real recognition: a promotion, more responsibility.