A non-custodial BNB Smart Chain wallet built as a working proof of concept — on-device key generation, biometric locking and real mainnet transactions behind deliberate safety ceilings.
Sole developer — architecture, security model and UI
Live demo — proof of concept
Running on BNB Smart Chain mainnet with a 0.01 BNB send ceiling. Clickable web preview is live; Android APK ships via EAS. Built as a demonstrator, not a place to store funds.
Don't take my word for it — open it and click through.
Self-custody asks people to personally secure a private key, and most wallets hand that problem straight to the user: here is a seed phrase, do not lose it, do not show it to anyone. The security model is sound and the user experience is not, which is why most people still leave their assets on an exchange.
Nexiae is a proof of concept for the other side of that trade-off — keys generated and stored on the device, unlocked with the fingerprint or face scan people already use, and a send flow built so that the irreversible action is deliberately hard to take by accident. It runs against BNB Smart Chain mainnet with real funds, because a wallet that only works on a testnet proves very little.
Keys are generated on-device with ethers v6 (BIP-39 12-word mnemonic, BIP-44 derivation) seeded from the OS CSPRNG. The private key lives in expo-secure-store — iOS Keychain and Android Keystore-encrypted storage — is excluded from device backups, and is read only at the moment a transaction is signed. The mnemonic is shown exactly once at creation and never persisted.
Access is gated by Face ID or fingerprint through expo-local-authentication on device, WebAuthn (Windows Hello / Touch ID) on the web preview, with a PIN fallback where neither exists. While locked, the wallet UI is not mounted at all rather than merely hidden.
Because mainnet transactions are irreversible, the send path is built around friction in the right places: address checksum validation, a mandatory review step showing the full recipient, gas estimate and total before anything is signed, and a hard ceiling on a single send. Signing is blocked outright in the browser build, since a browser cannot store a key securely — the hosted preview is read-only by design.
On top of that sits a bottom-tab dashboard with live USD portfolio valuation, tracked BEP-20 balances, a QR receive screen, local transaction history linked through to BscScan, and a PancakeSwap V2 swap flow including the approve-then-swap sequence.
Tell me what you're building and I'll tell you how I'd approach it — architecture, stack and a realistic timeline.
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