Funds model
Every fund is a ledger with clear stakes.
Your weight in a fund = records × quality × uniqueness. Your stake is your weight divided by the fund's total weight.
On each deal the platform fee is deducted. A share (α) of net goes to earlier funds included via rollover; the rest is split by weight.
net = gross × (1 − fee) to_parents = net × α (split by included_share) direct = net − to_parents (split by weight)