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Custodial Model
Definition: Your business holds the private keys on behalf of users. Users access their funds through your application; they do not control their private keys.
Examples: Coinbase exchange account, Binance account, any exchange hot wallet balance.
Regulatory classification: Money Services Business under FinCEN (requires AML program, SAR filing capability, suspicious activity monitoring). May require state money transmitter licenses.
Security responsibility: Full responsibility for key security. Must use HSM or MPC. Must maintain hot/cold wallet separation. Must have SOC 2 Type II controls or equivalent.
User experience: Password reset available. Account recovery available. Familiar to non-crypto users. No seed phrase management.
Development cost: $150,000–$400,000+ (includes HSM infrastructure, security audit, regulatory architecture).
When to choose: Consumer exchange application. Any application where users are not expected to manage private keys. When account recovery is a required feature.
Non-Custodial Model
Definition: Users generate and hold their own private keys. Your application provides the interface; you never have key access.
Examples: MetaMask, Rainbow, Coinbase Wallet (self-custody), Trust Wallet.
Regulatory classification: Typically not an MSB (you do not hold or transmit funds). Simpler regulatory footprint.
Security responsibility: User is responsible for key backup. No server-side key storage. Your attack surface is the application code, not the key material.
User experience: Seed phrase backup required. No account recovery without seed phrase. Higher onboarding friction for non-crypto users (unless social login wallet is used).
Development cost: $47,000–$180,000.
When to choose: Application where users are expected to own assets independently. When you cannot or do not want MSB regulatory classification. DeFi wallet, NFT portfolio wallet, self-sovereign identity applications.
The Social Login Middle Path
Social login wallets (Magic Link, Privy, Web3Auth) provide non-custodial key generation with social authentication (Google, Apple, email). Key backup via the user's Google account. Seed phrase optional. Regulatory classification: non-custodial (the provider holds no key material; key is controlled by user's Google credentials).