通过产品募集 200 万美元+、1000+ 并发用户，从零在 6 周内构建。

sequenceDiagram
  autonumber
  participant U as User
  participant FE as Next.js DApp
  participant API as NestJS API
  participant W as Wert.io
  participant NP as NOWPayments
  participant KMS as Cloud KMS
  participant SC as LivLive Contracts
  U->>FE: select item · checkout
  FE->>API: POST /orders (pending)
  API-->>FE: orderId
  alt Fiat rail (card)
    FE->>W: open widget · pay
    W-->>API: signed IPN webhook
  else Crypto rail (USDT/USDC/…)
    FE->>NP: open widget · pay
    NP-->>API: signed IPN webhook
  end
  API->>API: verify signature
  API->>KMS: sign mint + payout tx
  KMS-->>API: signed tx
  API->>SC: LivLiveNFT.mint(to=user)
  API->>SC: LivLiveRevenue.distributeCommissions(refs)
  SC-->>API: emit events · tx hash
  FE->>API: poll order status
  API-->>FE: completed · tokenId