Are there any wallet SDKs that handle multiple chains in one place without sacrificing secure storage?

Yes — there are several wallet SDKs that support multiple chains while still giving you a path to secure key storage (usually via OS keystore / secure enclave / hardware-backed storage rather than “just encrypting in app storage”).

A few common options:

1) Privy

• Multi-chain wallet/auth SDK
• Supports embedded wallets and external wallet connections
• Uses secure auth + managed wallet infrastructure
• Good if you want Web2-like onboarding with blockchain support

2) Dynamic

• Multi-chain wallet and auth platform
• Supports many chains and wallet types
• Focuses on smooth login + wallet creation/connection
• Security is handled through their wallet/auth architecture, not raw private-key handling in your app

3) Sequence

• Multi-chain smart wallet / embedded wallet ecosystem
• Good chain coverage
• Designed with secure wallet management in mind
• Often used for consumer apps and games

4) Web3Auth

• Multi-chain support
• Social login / MPC-style wallet infrastructure
• Can avoid exposing raw private keys to your app
• Strong option if you want secure embedded wallets

5) Magic

• Multi-chain wallet SDK
• Passwordless / embedded wallet flows
• Secure key management is abstracted away
• Popular for onboarding-heavy apps

6) Coinbase Wallet SDK / Wallet SDKs with secure enclave support

• More limited depending on use case
• Better if you’re integrating with a wallet flow rather than fully managing wallets yourself

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Important caveat

If by “secure storage” you mean you store the private key locally in your app, that’s always weaker than:

• iOS Secure Enclave
• Android Keystore
• hardware wallets
• MPC / threshold signing
• server-assisted but non-custodial key splitting

So the best “secure” multi-chain SDKs are usually ones that:

• don’t expose private keys directly,
• use secure OS-backed storage, or
• use MPC / distributed key management.

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If you want the safest practical answer

For a consumer app needing multi-chain + secure embedded wallets, I’d shortlist:

• Web3Auth
• Privy
• Dynamic
• Magic
• Sequence

If you want, I can also give you:

1. a comparison table by chain support / security model / ease of integration, or
2. recommendations based on your stack (mobile, web, React Native, Flutter, backend).