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. A computed insight surfaced in the app on the scan result and analysis screens. See: 05.
Contribution Center — The user-facing surface where users identify products and enrich contribution data. See: 05.
App surfaces — The product surfaces of the app: dashboard, scan (upload), receipts, bills, rewards, achievements, analysis and insights, friends. See: 00.