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Technologies and flows

The system map behind offline promises and deferred clearing.

AirPay combines a React Native wallet, local NFC/BLE discovery, shared TypeScript protocol logic, FastAPI sync services, and Solana Anchor contracts.

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Protocol path

1Wallet signs
2Local transport carries
3Backend syncs
4Solana records

Architecture layers

Wallet

React Native Android

Local profile, mnemonic wallet, signing, readiness, QR, NFC/BLE state, and guided onboarding.

Protocol

Shared TypeScript rules

Canonical payloads, policy checks, reserve limits, risk snapshots, and journal evidence.

Chain

Solana / Anchor

Wallet profiles, claims, reserves, metadata, settlement batches, and penalty records.

Core flows

Online path

When connectivity exists, the wallet can submit directly and sync operational state.

  • User-controlled signing
  • Backend provisioning
  • Solana settlement record

Offline promise path

When isolated, the sender creates a bounded signed promise with evidence for later clearing.

  • Reserve capacity gate
  • Local trust policy
  • Reconnect claim lifecycle

The technical page should make settlement assumptions explicit: offline creation is not final offline settlement.