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The Fundamental Difference
Custodial wallet: Your servers hold private keys on behalf of users. Users authenticate with username/password. You can: recover accounts, freeze suspicious accounts, reverse errors (within limits). You must: register as a money transmitter, implement BSA/AML program, maintain SOC 2 security controls.
Non-custodial wallet: User's device holds private keys. You never see or store them. You cannot: recover lost keys, freeze accounts, reverse transactions. You need not: register as a money transmitter (typically), implement custody-level security infrastructure.
Regulatory Impact
Custodial = MSB: FinCEN considers custodial crypto wallets money transmission. MSB registration + state money transmitter licenses + AML program required. Cost: $25,000–$150,000 in first-year compliance.
Non-custodial = typically NOT MSB: FinCEN's 2019 guidance explicitly states that "providers of non-custodial wallets" are not money transmitters when they do not have control over user funds. Non-custodial wallet providers avoid the most burdensome compliance requirements.
User Experience Impact
Custodial advantages: Account recovery (forgot password → reset, like normal web app). Smoother onboarding (no seed phrase). Familiar UX patterns for non-crypto users.
Non-custodial advantages: True user ownership. No counterparty risk (if you go bankrupt, user funds are safe). No regulatory exposure on the user's part.
Hybrid (Magic Link, Privy): Social login creates a non-custodial wallet — the key is stored in device secure hardware, not on the provider's servers. Combines custodial-like UX (no seed phrase) with non-custodial security model.