A few days ago, we shared a story that sounded like a movie script: $38 million in Bitcoin vanished from about 500 wallets in just 25 minutes.
Nobody gave away their password. No exchange got hacked. No one clicked a bad link. The thief simply figured out the keys and walked away with the money.
Over the weekend, things got much bigger.
First reported
$38M
~500 wallets
Over the weekend
$88M+
4,500+ wallets
As experts tracked the stolen funds across the blockchain, that total jumped from $38 million to over $88 million stolen from more than 4,500 wallets.
Here is what actually happened in simple terms, plus what you need to do to make sure your money stays safe.
How the Thief “Guessed” the Un-guessable
To understand what happened, imagine a combo lock with billions of possible combinations. Guessing the right code should be mathematically impossible.
Every crypto wallet relies on a computer program picking a completely random, impossible-to-guess number to create your master key.
The problem
The software that picked the numbers had a glitch.
Instead of choosing from billions of complex possibilities, a specific update on certain hardware devices accidentally caused the system to pick from a very small list of options.
It is like setup software promising you a 20-digit password, but secretly picking numbers between 1000 and 5000.
Once the thief realized the computer was picking from such a small pool, they did not need to hack anyone’s physical device. They just ran a basic computer program that tried all the easy combinations, unlocked the matching wallets, and drained them.
The Big Realization: Safe Storage Doesn’t Fix a Weak Start
Many people think owning a physical hardware wallet means they are automatically 100% safe. Hardware wallets are great at keeping your key offline, away from internet hackers.
However, hardware devices are only as good as the moment your key is created.
If the device picked a weak “random” number the day you set it up, no amount of physical protection will save you. It is like putting a bad combination lock inside a giant steel safe. If someone knows the combo, the safe cannot stop them.
Even worse
Even worse, updating the software on your device today cannot fix a key that was created weakly in the past. Upgrading protects you going forward, but the old key stays weak until you move your funds to a brand-new setup.
How to Check and Protect Yourself
If you own crypto, here are three plain steps to protect your funds:
1. Move funds off old or questionable setups: If your wallet was generated on an affected device or software version, do not just update it. Create an entirely new wallet, test it with a small dollar amount, and transfer your funds over.
2. Use a Passphrase: People who added an extra custom passphrase to their setup were completely safe. Because you pick the passphrase yourself instead of relying on the computer’s generator, the thief’s shortcut did not work.
3. Do not put all your trust in one device: The biggest lesson here is that relying on one machine on one afternoon to generate your key is a single point of failure.
Why We Use MPC for Coinmama Wallet
Coinmama Wallet
This situation is exactly why we built the Coinmama Wallet around MPC (Multi-Party Computation).
Instead of relying on one single device to make your master key, MPC splits the creation process across multiple independent devices. The complete key is never created or stored in one single place.
Think of it like a bank vault that requires three separate keys held by three different people in three different cities. Even if one person’s key maker has a glitch, a thief still gets nothing because they would have to break three separate systems at the exact same moment.
The Takeaway
Self-custody is still the best way to own your money, but “offline” does not automatically mean “foolproof”.
Take 10 minutes this week to review how your key was created. Add a passphrase, look into multi-key protection, or try an MPC wallet. Just do not leave your life savings hanging on a single machine’s random guess.
