Building a high-throughput blockchain finance platform with sub-200ms perceived transaction times
An 8-month engagement to design and ship a production blockchain fintech platform — from whitepaper to live users.
Fintech that moves at blockchain speed without sacrificing compliance
Numerico is a blockchain-based financial platform for digital asset management and peer-to-peer transactions. When they engaged FiveNodes, they had a technical whitepaper, a UI concept, and a board deadline.
The core engineering challenge: blockchain confirmations are slow, but users expect bank-speed UX. We built an optimistic UI layer that feels instant while confirmations happen asynchronously via WebSocket.
We also embedded KYC/AML compliance into the transaction flow without killing conversion — requiring custom middleware and careful UX design alongside the engineering work.
Blockchain transaction engine
Smart contract integration, optimistic UI updates, and real-time confirmation tracking via WebSocket. Users see results instantly; compliance catches up in the background.
KYC/AML compliance layer
Third-party identity verification embedded into onboarding, with automatic transaction screening above threshold amounts by jurisdiction.
Financial dashboard
Real-time portfolio views, transaction history, and performance analytics synced to chain state.
Admin and risk management
Internal compliance tools: transaction flags, risk scoring, freeze capabilities, and full audit trail.
Optimistic UX over a compliant foundation
We started with protocol selection and smart contract architecture — choosing an EVM-compatible chain that balanced throughput, tooling maturity, and regulatory acceptability.
The optimistic UI system was the core product innovation. Every transaction is accepted immediately in the UI, queued with a local state machine, and then confirmed or rolled back via WebSocket as the chain processes it.
KYC was integrated with Onfido — we built a wrapper that handles jurisdiction detection, document selection, and callback webhooks with zero user-facing latency on post-verification flows.
Protocol and architecture (Weeks 1–4)
EVM-compatible chain selection, smart contract architecture, optimistic update system spec, KYC vendor selection (Onfido).
Core platform (Months 2–5)
Transaction engine, WebSocket confirmations, portfolio dashboard, onboarding + KYC flow, Stripe on-ramp integration.
Compliance and scale (Months 6–8)
AML monitoring, risk scoring engine, admin dashboard, automated reporting, load testing to 50K concurrent users.
A stack built for blockchain-native finance
Full platform delivered in 8 months
The optimistic UI made every transaction feel instant — users reported the experience as faster than traditional banking despite the underlying blockchain confirmation times.
The compliance architecture was built to SOC2 Type II standards from the start. When Numerico went to their investors and early partners, the compliance story was already airtight.
We interviewed six firms. FiveNodes were the only ones who immediately understood both the blockchain engineering challenge and the compliance layer. They delivered a platform we're genuinely proud to show investors.
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