Identity and contribution

Proof of Expense (PoE) — The engine that turns a verified receipt into a contribution record. The core protocol primitive of Yumo Yumo. See: 02 Receipt Pipeline.
Proof of Contribution (PoC) — The 10% allocation rail that rewards non-receipt contributions: engineering, governance, ecosystem work, and the founding team. The team earns through PoC on the same impact-weighted logic as outside contributors. See: 04 Tokenomics Mechanics.
Price memory — The household-level historical price record that Yumo Yumo builds as a user accumulates verified receipts. See: 02 Receipt Pipeline, 05 Data Schema and API.
Hidden cost — The decomposed cost components (rent, energy, logistics, tax, margin) of a household's basket, surfaced in the Yumbie app and quantified as ePoints. See: 05.
Contribution Hub — The user-facing surface where contributions, level, and rewards are visible. See: 05.
Yumbie surfaces — The four product surfaces of the Yumbie app: Home, Payments, Shopping, Goals. See: 00.