Been looking into open source bitcoin wallet options lately, and honestly there's way more solid choices now than people realize. Everyone talks about hardware wallets for security, but the ecosystem has really matured.

Trezor Safe 3 caught my attention first. It's got this EAL6+ certified chip that actually does the heavy lifting on security, and the price point around $59 is pretty reasonable for what you get. The open source firmware means you can actually verify what's running on the device, which beats a lot of competitors. Supports thousands of coins too, so it's not just Bitcoin locked-in.

If you're strictly Bitcoin though, Electrum is still the move. Been around since 2011 and people sleep on how lightweight it is. The whole thing runs fast because it doesn't download the entire blockchain like some wallets do. For an open source bitcoin wallet focused purely on BTC, the multi-sig support is actually valuable for serious investors. Only downside is the interface looks a bit dated, but honestly that's kind of a feature when you care more about security than aesthetics.

Wasabi is the other Bitcoin-focused option worth mentioning, especially if privacy matters to you. The CoinJoin feature is built in and it routes everything through Tor automatically. So if you want an open source bitcoin wallet that actually prioritizes anonymity, this is the strongest option. The privacy features do add some transaction time though.

For Ethereum people, MyEtherWallet is still the cleanest interface. No private keys sitting on someone's servers, everything happens client-side. You can connect hardware wallets to it, which gives you that extra layer. Supports all the ERC-20 tokens and Layer 2 networks, so it's pretty flexible.

Unstoppable Wallet is worth checking out if you're mobile-first. Mobile wallets usually worry me from a security standpoint, but this one actually takes privacy seriously. Tor integration, support for privacy coins, no KYC. It's clean.

The thing about open source wallets generally is you're not just trusting some company's promises. Thousands of people can audit the code, which means bugs get found and fixed way faster than closed-source alternatives. Yeah, technically hackers can study the code too, but that's actually less scary than a hidden backdoor nobody can see.

If I'm being real, most people should probably start with a hardware wallet for serious holdings. Trezor Safe 3 is the entry point. But if you're a Bitcoin purist or want maximum privacy, Electrum and Wasabi give you that technical control without breaking the bank. The open source angle matters more than people think when we're talking about your actual money.