In-depth analysis of Bitcoin security: Coldcard firmware vulnerability exposed,$112 million in Bitco

As BTC, ETH and XRP face increased volatility, EX DeFi is attracting more and more attention with its cloud mining model that focuses on long-term digital asset participation.

Summary

Bitcoin's volatility has prompted investors to view EX DeFi's cloud mining model as an alternative way to profit from digital assets. EX DeFi is attracting attention from bitcoin holders seeking to diversify their profits through cloud mining and renewable energy infrastructure. Against the backdrop of continued volatility in the cryptocurrency market, EX DeFi provides Bitcoin holders with a channel to participate in cloud mining without expensive mining hardware.

The cryptocurrency market recently suffered another shocking security incident. The attacker used vulnerabilities in Coldcard's hardware wallet firmware to steal funds from numerous Bitcoin addresses, raising widespread concerns about the security of hardware wallets and the risk of self-custody of digital assets. Public investigations show that the scale of thefts related to this vulnerability has reached hundreds of millions of dollars, and the total losses are still in the statistics.

The incident began on July 30, 2026. Galaxy Research found that the attacker transferred approximately 1083 BTC from more than 1000 addresses in just 41 minutes, followed by multiple rounds of fund transfers. As the investigation progresses in mid-August 2026, the number of confirmed addresses affected and the size of stolen BTC continue to rise.

What's unique about this incident is that the problem does not stem from the Bitcoin blockchain itself, but is related to the random number generation mechanism used by certain Coldcard firmware versions when creating wallet mnemons. The vulnerability caused the seeds generated by some wallets to become predictable, increasing the risk of private keys being pushed out and funds being stolen.

This has prompted many investors to rethink a fundamental question: Is Bitcoin itself still safe?

In fact, this incident highlights the security risks inherent in cryptocurrency storage tools and private key management, rather than the breach of the Bitcoin network itself. For investors, choosing a safe and reliable asset management method has become an increasingly critical link in digital asset investment.

As market panic intensified, the prices of major cryptocurrencies such as BTC, ETH and XRP experienced significant fluctuations. Many investors are starting to think: Beyond simply waiting for prices to rise, is there a more efficient and sustainable way to participate in Bitcoin's long-term value growth?

In this context, more and more investors are turning to EX DeFi, a platform that provides stable returns by combining cloud mining with renewable energy. It helps investors hedge short-term market risks while focusing on the long-term value of Bitcoin and exploring more diversified ways to participate in digital assets.

Firmware defects dating back to 2021

The root cause of the incident can be traced to a firmware update released by Coinkite in 2021. This update introduces a flaw in the random number generation process used to generate mnemonic words. Mnemonic words are a key component in generating a hardware wallet master key; if randomness is insufficient, attackers can narrow the range of potential seeds through calculation and analysis, thereby increasing the likelihood of recovering the relevant private key.

According to research institutions such as Galaxy Research, this issue has previously been reported to Coinkite by researchers. The large-scale attack suggests that some wallet seeds generated in the past may have been at risk for a long time. Public reports pointed out that the specific scope of the affected Coldcard devices and firmware versions has yet to be further confirmed by Coinkite's official security bulletin. It is worth noting that updating firmware alone cannot repair wallet seeds that have been generated using affected firmware; users must follow the manufacturer's security recommendations to migrate assets.

EX DeFi Cloud Mining: A New Choice for Bitcoin Investors

Against the backdrop of intensified market volatility, more and more digital asset investors are turning their attention to EX DeFi, trying to explore diversified revenue generation models through cloud mining and revenue aggregation. For Bitcoin holders, EX DeFi provides a relatively simple way to participate in the digital asset ecosystem compared to highly volatile investment methods such as futures trading. Users can obtain Bitcoin mining services without having to deploy mining hardware or bear equipment maintenance costs, thereby maximizing the utility of digital assets while leveraging the long-term value of Bitcoin.

Why is EX DeFi attracting more and more attention?

Against the background of frequent digital asset security incidents, investors are paying more attention to asset storage, platform security and risk management.

1. Security and Stability

EX DeFi adopts a multi-layered security architecture, integrates McAfee and Cloudflare technologies, and cooperates with offline cold wallets and other measures to provide comprehensive protection for platform operations and user assets.

2. Environmentally friendly and efficient

platform's mining business utilizes renewable energy such as solar energy, wind energy and hydropower, aiming to minimize the impact of energy consumption on the environment while improving computing efficiency.

3. The Compliance and Transparency

platform continues to improve operating standards, data transparency and user protection mechanisms to provide a clearer and more reliable environment for cryptocurrency services.

4. Intelligent hosting

EX DeFi handles daily operations, computing power management and revenue settlement through professional teams and automated systems, allowing users to easily obtain passive income.

5. Multi-currency support

The platform supports multiple mainstream digital assets such as BTC, ETH, DOGE, SOL, XRP, USDC, LTC and USDT, providing greater flexibility for different users.

6. Alliance Rewards

The platform provides an alliance plan. Users can earn a recommendation commission of 3% + 2% by inviting friends (up to US$50,000), which can easily increase passive income even if they do not invest themselves.

How to use EX DeFi?

1. Registration

Visit the EX DeFi platform to create an account and receive a reward of US$17 after completing registration.

2. Select a plan

to deposit in Bitcoin or other supported digital assets, and then select the appropriate mining plan based on your budget and contract term.

3. After the contract to obtain mining revenue

starts, the system automatically contributes computing power to the mining pool; the revenue is automatically settled and credited to the account within 24 hours. After the contract expires, the principal will be automatically returned.

Common contract examples

BTC (novice trial contract): Investment amount: US$100| Deadline: 2 days| Daily earnings: $4| Total income: US$100 + US$8

DOGE (Golden Shell Mini Dog Coin Professional Edition): Investment amount: US$500| Deadline: 6 days| Daily earnings: $6.50| Total Income: US$500 + US$39

BTC (Canaan-Avalon-A1466): Investment: US$1,000| Deadline: 10 days| Daily earnings: $13.4| Total revenue: US$1,000 + US$134

LTC (Bitmain Antminer L7): Investment: US$5,000| Deadline: 20 days| Daily earnings: $73.5| Total revenue: US$5,000 + US$1,470

BTC (Bitmain S19K-Pro): Investment: US$10,000| Deadline: 30 days| Daily earnings: $161| Total Revenue: US$10,000 + US$4,830

Summary

The Coldcard incident reminded the market that the security of the Bitcoin blockchain and the security of digital asset storage tools are two different issues. This incident did not involve vulnerabilities in the Bitcoin network itself, but exposed the possible serious consequences of specific hardware wallet firmware flaws, prompting investors to pay more attention to issues such as private key generation, asset custody and platform security. For long-term BTC investors, in addition to focusing on price movements and market cycles, it is equally important to consider how to reduce the risks brought by relying on a single storage method and explore more diversified approaches to digital asset management. EX DeFi aims to provide users with an alternative to participating in the digital asset ecosystem through cloud mining, computing power management and renewable energy.