If you hold more than Bitcoin, you need a hardware wallet that supports multiple chains without compromising security. We compared Tangem (16,000+ assets), Keystone 3 Pro (5,500+, air-gapped), and BitBox02 Multi (Swiss-made, curated) to find the best fit for diversified portfolios. Here's our verdict.
If you hold more than one cryptocurrency — and these days, who doesn't? — you've felt the tension between convenience and security. A diversified portfolio means Bitcoin, Ethereum, Solana, maybe some L2 tokens, and a handful of altcoins you're curious about. You want them all in one place, but you don't want to trust a hot wallet or an exchange.
Enter the multi-currency hardware wallet. The trade-off is real: supporting more chains means more code, which can mean a larger attack surface. But the best devices manage that risk with certified secure elements and thoughtful design. Here are the three we'd buy today.
16,000+ assets · 87+ blockchains · credit-card form factor
Tangem holds the crown for sheer volume. It supports over 16,000 cryptocurrencies and tokens across 87+ blockchain networks1, making it the most versatile hardware wallet on the market. The wallet itself is a metal card — no screens, no batteries, no cables. You manage it entirely via NFC and your phone.
The trade-off is that Tangem relies on a mobile app rather than a dedicated screen for transaction verification. For many users that's fine, but security purists may prefer a device with its own display.
Best for: Anyone holding a diverse portfolio of altcoins who wants the most portable, drop-in-your-wallet form factor.
5,500+ assets · air-gapped · large touchscreen
The Keystone 3 Pro supports over 5,500 cryptocurrencies2 and uses a fully air-gapped design — it never connects to a computer or phone via cable. Transactions are signed via QR codes scanned by its 4-inch color touchscreen. This eliminates an entire class of USB-based attack vectors.
It supports a wide range of chains including Bitcoin, Ethereum, Solana, and many more. The large screen makes reviewing transaction details genuinely comfortable.
Best for: Security-conscious users who want broad chain support and prefer an air-gapped workflow.
Bitcoin, Ethereum + ERC-20 · Swiss engineering · EAL6+ certified
The BitBox02 Multi Edition takes the opposite approach from Tangem: instead of supporting everything, it focuses on doing a few things exceptionally well. It supports Bitcoin, Ethereum, and all ERC-20 tokens3, with a CC EAL6+ certified secure element — the same chip grade used in passports and payment terminals.
It's made in Switzerland, ships with open-source firmware, and uses a unique two-button interface for transaction confirmation. The companion app (BitBoxApp) is polished and beginner-friendly.
Best for: Bitcoin and Ethereum holders who prioritize top-tier security certifications and a curated, no-compromise experience.
| Dimension | Tangem | Keystone 3 Pro | BitBox02 Multi |
|---|---|---|---|
| Supported assets | 16,000+ | 5,500+ | BTC, ETH + ERC-20 |
| Security cert | EAL6+ (chip) | EAL6+ (chip) | EAL6+ (chip) |
| Connection | NFC (phone app) | Air-gapped (QR) | USB (wired) |
All three use an EAL6+ certified secure element at the chip level, so the base security is comparable. The real differences come down to:
We focused on network compatibility, ease of adding new tokens, and security certifications (EAL6+).
Tangem wins on sheer breadth — 87+ networks means you can store almost anything you own on one card. Keystone splits the difference with 5,500+ assets and the added safety of air-gapped signing. BitBox02 Multi is the conservative choice: fewer assets, but Swiss engineering and a curated approach that reduces attack surface.
For contrast, consider the Coldcard Mk4 — a Bitcoin-only wallet that deliberately supports nothing else4. It's the ultimate example of the "curated" philosophy taken to its logical extreme. If you're a Bitcoin maximalist, that's the right call. But for the rest of us holding a diversified portfolio, one of the three wallets above is the better fit.
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