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Crypto Wallets — Biometric Wallet Authentication — Passkeys and Face ID Integration for Crypto Wallets
Biometric wallet authentication (Face ID, fingerprint, passkeys) eliminates seed phrase friction — the single biggest UX barrier to crypto adoption. Here is the implementation architecture.
// WebAuthn (Passkeys) integration with smart contract wallets // Combines: device biometric + smart contract account (ERC-4337) import { startRegistration, startAuthentication } from '@simplewebauthn/browser'; async function createPasskeyWallet() { // 1. Request registration options from your backend const optionsResp...
// Passkeys use P256 (secp256r1) curve — different from Ethereum's standard secp256k1 // EIP-7212 precompile enables efficient on-chain P256 verification (available on most L2s) contract PasskeyAccount is BaseAccount { uint256 public publicKeyX; uint256 public publicKeyY; address constant P256_VERIFIER = 0x000000000000...
// Passkeys sync across a user's devices via iCloud Keychain (Apple) // or Google Password Manager (Android/Chrome) // This provides built-in backup without seed phrases // Adding a second device to the same smart account async function addDevicePasskey(existingAccountAddress: string) { // 1. Create new passkey on new...
Common integrations: The Graph, Alchemy/Infura, OpenZeppelin Defender, and popular wallet providers.
Clarify requirements, compliance needs, architecture risks, and launch goals.
Implement core contracts, integrations, product flows, tests, and deployment automation.
Run QA, prepare audit handoff, deploy infrastructure, and support production rollout.
This is the critical recovery question. Solutions: (1) iCloud Keychain / Google Password Manager backup means passkeys persist even after device loss (as long as the user can sign into their Apple/Google account on a new device), (2) Social recovery as a backup mechanism (guardians can recover the account if passkey access is fully lost), (3) Email-based recovery flow that re-establishes a new passkey after identity verification. Production wallets should implement at least one backup mechanism beyond the passkey itself.
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