Why can't I prove I am solvent without showing my balance?
Opportunity
Public chains make every balance visible forever. Funds and exchanges get asked to prove reserves, and the usual answer is either a screenshot you have to trust or a full disclosure that leaks everything. There is no cheap way to prove one fact about your money without revealing the rest.
Why it matters
Selective proof is the missing primitive that lets regulated money live on a transparent ledger.
How I score the opportunity
The Opportunity Score is my own read, not a measurement: how much it hurts, how often it bites, and how little exists to solve it today. Higher means I think it is more worth building.
How much pain it causes when it shows up.
How often people actually run into it.
How little good tooling exists for it today.
More problems worth solving
Why is moving money between chains still scarier than the early internet?
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