In the ever-evolving world of cryptocurrencies, safeguarding your digital assets is paramount. Enter Samourai Wallet, a mobile Bitcoin wallet for Android that places privacy and security at its core. In this personal and educational review, we’ll explore what sets Samourai apart and whether it lives up to its promises.
Samourai Wallet is a Bitcoin-only Android mobile wallet, designed with a laser focus on safeguarding your funds and preserving your privacy. It’s open-source and coded in Java, with its source code available for scrutiny on GitHub. While it’s currently in pre-release (version 0.99.95).
But what makes Samourai unique? Unlike many other wallets, it steadfastly adheres to the foundational principles of Bitcoin, emphasizing fungibility, security, transparency, financial privacy, and decentralization. Additionally, it was among the first mobile wallets to embrace SegWit transactions, which not only reduces transaction costs but also paves the way for the Lightning Network, a revolutionary development for mobile wallet users.
The only drawback is the absence of multi-signature support, which may deter businesses and teams requiring jointly controlled accounts. Nonetheless, Samourai does facilitate multiple accounts, allowing individuals to segregate personal and business transactions.
The commitment of the Samourai developers to Bitcoin’s core principles is evident in their statement:
“We are privacy activists who have dedicated our lives to creating the software that Silicon Valley will never build, the regulators will never allow, and the VC’s will never invest in. We build the software that Bitcoin deserves.”
Samourai Developers
In the realm of privacy, Samourai excels. It incorporates essential privacy tools, including VPN and TOR support, to obscure your IP address. Yet, it goes further by offering various features that allow you to conceal your transaction history and Bitcoin balance from prying eyes.
By default, each Samourai transaction provides the following safeguards:
- Generates a new wallet address for each incoming transaction to prevent tracking of your transactions and balances.
- Matches “change” to the wallet type you’re sending to (SegWit or non-SegWit).
- Randomizes “change” outputs to avoid linkages caused by frequent address changes.
- Utilizes BIP 126 to minimize references to past transactions, reducing traceable metadata.
These features collectively minimize the risk of connecting your transactions to your overall balance and history. For enhanced privacy, users can enable the Ricochet feature, which routes transactions through a series of additional addresses before reaching their final destination. This disguises the origin of payments, albeit for a fee of $2.50 plus additional mining fees.
Samourai also introduces PayNyms, allowing you to receive payments without revealing your actual address. While this feature enhances privacy, it is supported by many other wallets, limiting its uniqueness.
Samourai Fee & Transaction Features
Samourai doesn’t just prioritize privacy but also offers features that benefit the Bitcoin transaction economy. The “smart fee” functionality monitors network congestion, suggesting an appropriate fee, or users can set their own fees. Furthermore, Samourai supports “Replace by Fee,” allowing users to increase a fee that’s set too low, ensuring transactions don’t get stuck in the mempool.
The combination of these features keeps transaction fees reasonable, a critical consideration for mobile wallet users. Additionally, Samourai boasts a unique “Batch Spending” feature, enabling users to bundle numerous small transactions into one, potentially saving up to 30% on mining fees.
For time-sensitive transactions, Samourai offers support for the Child Pays for Parent (CPFP) feature, allowing recipients to expedite stuck transactions by paying an additional fee.
Samourai Security Features
In terms of security, Samourai Wallet stands strong. Your private keys are fully encrypted and remain on your device. As a hierarchical deterministic wallet, Samourai generates a seed phrase when initialized, crucial for wallet recovery in case of device loss or theft.
Notably, Samourai introduces a unique feature – the ability to test your backup phrase for functionality. This goes above and beyond the norm in ensuring the integrity of your backup.
Every Samourai transaction requires a PIN (5-8 digits) for approval, with the PIN randomized on the screen to thwart screen capture attempts. The importance of safeguarding your PIN cannot be overstated.
Samourai offers the option to connect to a Bitcoin Core full node, providing the ultimate in privacy and security. By utilizing a full node, your Samourai wallet retrieves blockchain data directly from your node, further enhancing your autonomy.
While major hardware wallet support is currently lacking, Samourai is compatible with the OpenDime hardware USB stick, offering an additional layer of security. Simply connect your OpenDime to your phone to verify balances, receive payments, or sweep funds to your OpenDime.
One significant limitation of Samourai is its exclusive availability on the Google Play Store. Given Google’s association with data breaches and misuse, this may not align with the utmost user privacy.
Moreover, in 2019, Google Play Store demanded the removal of key security features from Samourai, including Remote SMS, SIM Switch defense, and Stealth mode. This move sparked concern and led the developers to apply for an exemption, which was ultimately denied.
However, there’s hope on the horizon. Samourai’s developers are actively exploring alternative distribution channels. In a blog post, they announced their intentions to include self-hosted APK downloads and distribution through the open-source F-Droid app store, promising to reintroduce the previously removed security features. These avenues not only ensure greater privacy but also respect users’ autonomy.
The Samourai Stealth Feature
The unique “Stealth Mode” sets Samourai apart, earning it the moniker “a bitcoin wallet for the streets.” When activated, the wallet’s shortcut vanishes from your mobile’s desktop display. Access requires dialing your PIN, similar to a phone number. While not foolproof, this feature deters casual snoopers inspecting your phone for installed apps and wallets.
Samourai Remote Commands
Another distinctive feature is the “Remote Commands” functionality. It allows you to send an SMS with your Samourai PIN to instruct the wallet to respond with your backup seed phrase or self-destruct. This means that if your phone is lost or stolen, you can remotely retrieve your funds, transfer them to another wallet, and erase Samourai from the lost or stolen device. Nonetheless, exercising caution and testing the self-destruct feature before funding your wallet is advisable.
Conclusion
Samourai Wallet combines a myriad of privacy and security features into a well-designed Bitcoin wallet. It’s user-friendly for newcomers while offering potent tools for advanced users. While Samourai is already a commendable wallet, it is expected to improve with future releases that address hardware support and reinstates security features.
The suitability of Samourai hinges on your location and needs. If you live in a relatively safe environment and the lack of multi-signature capability or multi-currency support doesn’t concern you, then Samourai Wallet could be an excellent choice. It’s an exciting, privacy-centric option in the world of Bitcoin wallets, balancing ease of use with robust security.
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