Crypto Is Coming. Is Our Digital Security Ready?
Introduction
If you have been following cryptocurrency and blockchain for years, it is hard not to notice that something has changed.
What was once viewed by many as an experimental technology is increasingly becoming part of the financial system itself. The SEC and CFTC are moving forward with clearer frameworks for digital assets, regulators are addressing tokenized assets, financial institutions are exploring blockchain-based infrastructure, and the idea of tokenizing stocks, securities and other real-world assets is moving closer to reality.
For those of us who have been in the blockchain and digital-currency space for years, this is exciting. But there is another side to the story that deserves just as much attention.
The more financial value we put online, the more valuable that digital infrastructure becomes to attackers.
The Perfect Storm
We are heading toward a period where two major trends are colliding: more financial assets are becoming digital while the tools available to cybercriminals are becoming more powerful.
AI is an important part of that equation.
AI can help security teams identify vulnerabilities faster, analyze enormous amounts of data and respond to attacks. But those same capabilities can potentially help attackers automate reconnaissance, analyze exposed systems, search for vulnerabilities and scale attacks that previously required considerably more time and expertise.
We are already seeing why this matters.
Recent security incidents involving crypto wallets and other digital-asset infrastructure have demonstrated that even products specifically designed to protect cryptocurrency can have vulnerabilities. In July and August 2026, an exploit affecting Coldcard hardware wallets led to losses that grew from an initial estimate of approximately $38 million to more than $116 million as the full scope became clear, making it one of the largest hardware wallet exploits on record. Separately, in September 2026, D'CENT disclosed unauthorized asset transfers involving its mobile App Wallet.
The lesson isn't that one wallet is safe and another isn't.
The lesson is that no single security product makes you invulnerable.
Cold storage can reduce certain risks, but it doesn't eliminate vulnerabilities in hardware, firmware, software, supply chains, recovery procedures or the person using the device.
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Your Crypto Is Only as Secure as the Ecosystem Around It
This is something I think many crypto owners overlook.
People spend a lot of time researching which exchange or hardware wallet to use, but far less time thinking about the email account controlling that exchange, the phone number attached to the account, the computer used to access it, the browser being used, the home Wi-Fi network, cloud backups and the other accounts connected to the same identity.
An attacker doesn't necessarily need to break into your wallet.
They may find an easier way around it.
That is why I believe anyone holding meaningful amounts of cryptocurrency should periodically conduct a broader digital-security review.
A Free Personal Security Checkup
Start with your email. Your financial and crypto accounts should ideally not share the same email address you use publicly for social media, newsletters or everyday conversations with friends and family. Use a private address for important financial accounts, strong unique passwords, and the strongest form of multi-factor authentication available.
Don't reuse passwords. A password stolen from an unrelated website should never provide access to your email, bank, exchange or other important accounts. A reputable password manager can make unique passwords practical without requiring you to remember dozens of them.
Separate your digital identities where practical. You might use one email identity for banking, another for cryptocurrency, another for business and another for normal communications. The goal isn't paranoia; it's preventing one compromised account from becoming the key to everything else.
Review your phone just as carefully as your computer. Keep the operating system and applications updated, remove apps you don't use, review permissions, enable strong device protection and look at the privacy and security settings available on your particular phone.
Also look at your browser, DNS and network security. A reputable VPN can provide useful protection in some situations, secure DNS can help block malicious destinations, and device security software can detect certain threats, but none of these replaces good passwords, strong authentication and basic security awareness.
For a step-by-step version of this same review, see Efani's crypto mobile security audit checklist.
Your Hardware Wallet Isn't the Whole Story
If you own a hardware wallet, don't stop at asking whether it is considered a "good" wallet. The audit checklist covers firmware monitoring, security advisories, and seed-phrase storage in detail.
One angle worth adding here: think about who could access your recovery phrase today, and what would happen if you were suddenly unavailable and a trusted family member needed to deal with your assets. Most people plan for this with their physical assets. Fewer plan for it with a seed phrase.
The same principle applies to exchanges. Review withdrawal controls, authentication options, account recovery procedures, transaction notifications and other security features rather than choosing an exchange simply because someone online recommended it.
Don't outsource your security decisions to an influencer.
Research the product, understand what it protects, understand what it doesn't protect and decide whether it fits your particular situation.
SIM Swap Protection
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The SIM-Swap Problem
One of the areas I believe deserves far more attention is the mobile phone number.
A SIM swap occurs when an attacker convinces a mobile carrier to move your number to a SIM or eSIM controlled by them. If that number is being used to receive password-reset links or SMS authentication codes, control of the number can potentially become a pathway into email, financial and cryptocurrency accounts. SIM swap fraud has been climbing, and crypto holders are a disproportionate target.
The attacker doesn't necessarily need to break your encryption or defeat your hardware wallet. They may simply attack the weakest link surrounding it.
For important accounts, use passkeys, authenticator apps or hardware security keys where available instead of relying exclusively on SMS. Also ask your mobile carrier what protections it offers against unauthorized SIM or eSIM changes, or read our guide to SIM swap prevention for what to look for.
Your phone number is part of your financial identity. Treat it that way.
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Families Need a Security Plan Too
If you have a spouse, children or other family members who share access to devices or accounts, your security doesn't stop with your own phone.
Make sure everyone understands the basics: don't reuse passwords, don't click suspicious links, use MFA, keep devices updated and know what to do if a phone or computer is lost. A family password manager, secure backup plan and documented emergency procedure can be extremely useful, particularly when cryptocurrency or other significant financial assets are involved.
Most families have an estate plan for their physical assets.
Increasingly, they also need a plan for their digital assets.
Businesses Have an Even Bigger Problem
For businesses, the attack surface extends far beyond employee computers.
Start with the company's domain and website. Is DNSSEC configured where appropriate? Are SPF, DKIM and DMARC properly implemented to reduce email spoofing? Do you know every subdomain associated with your company, including old development and staging environments? Are your SSL certificates, CMS, plugins and server software current?
Then look at access.
Who has administrator access to your website, DNS provider, email platform, cloud infrastructure, accounting systems and other critical services? Are former employees and contractors still connected? Are backups available and, more importantly, are they protected from the same ransomware or account compromise that could take down your primary systems?
Businesses should also review exposed cloud services, forgotten domains and subdomains, API keys, third-party integrations, employee access, endpoint protection, logging, vulnerability scanning and incident-response procedures.
A website that looks perfectly normal to a customer can have a surprising number of security weaknesses behind the scenes.
The Financial System Is Changing
I don't think anyone can know exactly how quickly tokenization will develop or what the final digital financial system will look like. But it is becoming increasingly difficult to dismiss the direction in which the industry is moving.
More financial activity is moving onto digital infrastructure while AI and other technologies are giving attackers new capabilities.
That combination deserves our attention.
For those of us who have been around crypto for years, the opportunity is enormous. But the security challenge is going to grow along with it.
The question is no longer simply, "How do I protect my crypto?"
It is, "How do I protect the digital ecosystem surrounding my crypto?"
That means looking beyond the wallet and examining the email account, phone number, computer, browser, cloud accounts, exchange, bank, family members and companies we trust with our digital lives. See our full breakdown of why crypto investors need ironclad SIM swap protection for more on where the phone number fits into that picture.
And perhaps most importantly, it means periodically questioning the security products we already use rather than assuming that because we bought something called a "secure wallet" or "privacy service," the job is finished.
Security isn't a product.
It's a process.
One Option for Mobile Security
If you're reviewing the security of your mobile number, Efani is one service designed specifically around mobile privacy and protection against SIM-swap attacks. If you want to investigate it for yourself, Efani is currently offering a $99 discount through www.efani.com/promo.
As with any security product, do your own research and decide whether its features and protection model fit your needs.
