I don't think the issue will be hiding that you have the money. That's almost trivial. The person next to you on the bus could have a huge amount of money but

I don't think the issue will be hiding that you have the money. That's almost trivial. The person next to you on the bus could have a huge amount of money but until they start spending, you have no way of knowing. However, given the size of the payment, it must be possible to work out what enforcement this award is related to. Once that is established, the court documents should reveal the potential whistleblower's identity.