DOI : 10.17577/Blockchain has come a really long way since the inception of the first cryptocurrency in 2009. It’s a big part of why MarketsandMarkets expects its global market to grow from $32.99 billion in 2025 to over $393 billion by 2030. That’s a more than tenfold increase in just half a decade! What began as a niche experiment among developers is steadily evolving into a foundational technology across almost every sector.
In other words, people no longer associate it only with digital currencies. Take Indian investors, for instance. Instead of just monitoring markets, assessing the right moment to conduct bitcoin to INR conversions, these individuals are increasingly interacting with blockchain in ways that go beyond simple trading. You’ll find many of them exploring decentralised finance platforms, engaging with tokenised assets and even participating in governance decisions within blockchain-based ecosystems.
But as you may know, any technology that grows this fast inevitably attracts attention. And this is not just from innovators and investors, but also from those looking to exploit its weakness. In the case of blockchain, one of the biggest looming threats isn’t coming from traditional hackers. It’s coming from a new class of computing altogether, which is why quantum-resistant cryptography has become handy.
The quantum threat to blockchain’s security
For years, blockchain has relied on cryptographic systems like elliptic curve cryptography (ECC) to secure transactions and wallets. These systems work because deriving a private key from a public key is computationally infeasible for classical computers. In ECC, for instance, a 256-bit key would need roughly 2^128 operations to crack, which is astronomically high.
But quantum computers operate differently. Using Shor’s algorithm, a sufficiently powerful computer could perform the same calculation exponentially faster. And while innovation is yet to reach the level where they can break widely used blockchain keys, this is an area you wouldn’t want to ignore. In fact, according to Google, quantum computer hackers will be able to break most existing encryption systems by 2029.
And it follows that the crypto industry won’t be exempt from those attacks. There’s also the“store now, decrypt later” risk, where bad actors could already be collecting encrypted blockchain data today, waiting for quantum technology to mature before cracking it open. Given that blockchain records are permanent, this creates a long-term vulnerability that doesn’t simply disappear with time.
Thankfully, the industry is aware and is taking necessary measures. As crypto exchange Binance puts it, “Rising demand for network security and privacy has led to projects focused on preventing data tracking, smart contract hacks, and securing wallets with multisig.”
The shift toward quantum-resistant cryptography
One way to secure a system against a machine that doesn’t yet fully exist is to rethink the foundations of cryptography itself. And this could be done through replacing vulnerable mathematical problems with ones believed to remain difficult even for quantum computers. Developers could shift from, say, factorisation or discrete algorithms, to alternative approaches like lattice-based cryptography.
In lattice cryptography, problems are solved in high-dimensional space. Think of it as trying to find the closest point in a massive, multidimensional grid. Even with quantum speedups, these problems remain extremely difficult to crack. Hash-based techniques can also be helpful as they lean more toward the strength of cryptographic hash functions.
They operate by chaining together functions in ways that are computationally infeasible to reverse. It’s just like constructing a series of one-way doors. Each door leads to the next, but once you pass through, there’s no going back. One of the most exciting parts of hash-based systems is that they’re not like some newer methods that are still being stress-tested in real-world applications.
The systems have been studied extensively, providing good grounds for confidence in their reliability. A good example is the XMSS (extended Merkle Signature Scheme), which allows for secure, scalable implementation of signatures in blockchain networks. Interestingly, these approaches can actually work.
According to a ScienceDirect report, embedding algorithms like Crystals-Kyber into a blockchain platform demonstrated a more than 90% quantum resistance, meaning that quantum-safe systems are actually a possibility. Simply put, Crystals-Kyber is a key encapsulation mechanism that allows two parties to agree on a shared secret without exposing it to eavesdroppers.
Real-world progress and the road ahead
If you’re keen on industry trends, you possibly have noticed that the quantum computing power required to break blockchain-based encryption continues to decline. In a recent study by Caltech and quantum startup Oratomic, it was discovered that a system with around 26,000 qubits could break ECC-256 in just 10 days.
Can you believe that the estimated requirements for breaking a public-key encryption have fallen from roughly 1 billion in physical qubits in 2012 to about 10,000 today? This means the timeline for when quantum-based computers could realistically threaten blockchain security is much closer than many had expected. And to avoid being overtaken by cybercriminals, developers are already experimenting with various cryptographic models.
This is where projects like Quantum Resistant Ledger (QRL) and Cellframe (CEL) come into play. Interestingly, according to a report by CoinDesk, these tokens recently surged by 50%, highlighting growing market attention to truly post-quantum protocols. Elsewhere, BTQ Technologies Corp, a global tech-focused company, is pushing the boundaries of blockchain security once again.
According to the company, its latest Bitcoin Quantum testnet (v0.3.0) includes the first functional rollout of Bitcoin Improvement Proposal (BIP) 360, bringing the quantum-resistant Pay-to-Merkle-Root (P2MR) feature into action after its recent inclusion in Bitcoin’s proposal repository.
And if the blockchain world continues to welcome such advances, it will be rightly positioning itself to maintain its appeal. After all, the growing number of cyberattacks has made today’s consumers more suspicious, such that if they are to adopt a new technology, they must be sure of its security.
