In today's evolving world of technology, old blockchains are ill-equipped to deal with quantum threats, including cryptos with large market capitalizations. At the time when Bitcoin was created, devs were so enthralled with the robustness created by a near fail-safe network of systems that an emerging quantum threat didn't come to their mind. Relying on elliptic curve cryptography, specifically the secp256k1 curve, to generate private and public keys, it shows off its security by making it clear that brute-forcing its protection would require more time than the universe has existed. Quantum algorithms, however, have changed this belief. With the likes of Shor's algorithm capable of breaking this exponentially faster than classical methods, private keys aren't safe anymore. The problem is that this isn't a future concern anymore, as the public availability of blockchain addresses makes several cryptos' networks vulnerable if quantum computing catches up.
What the world now needs is something beyond the standard paradigm — a system that can stand strong against post-quantum threats. What it needs is post-quantum cryptography. But since integrating such techniques is impossible in the existing and rigid networks, Bitcoin.ℏ, being built on Hedera Hashgraph, emerges as a forward-thinking alternative. It is sleek, it is fast, and most importantly, it is quantum-resistant.
Bitcoin.ℏ's way of dealing with quantum threats is through adopting the SHA‑384 cryptography. This cryptographic hash function is more robust than what's available traditionally because it produces a 384-bit output hash by compressing the input data into a fixed-length digest. This creates encryption that only works one way, is unique, and is resistant to collisions. As a result, it has stronger resistance to Grover's algorithm. Since Grover's algorithm halves the security, SHA-384 offers 192-bit security after being attacked through this algorithm, which makes it much stronger.
The world can't delay making the blockchain quantum resistant anymore. The technology is nearly here, and while production at scale will still take time, the cryptocurrency economy was built to last forever. That can only happen if new projects emerge with quantum resistance as their main selling point. Bitcoin.ℏ is such a project. As a project developed on Hedera Hashgraph, Bitcoin.ℏ gets advanced security through SHA-384 encryption and the added advantage of fault tolerance, low energy consumption, and scalability. These traits could lead to better use cases, which further makes it a stronger alternative to other blockchains.
However, SHA-384 is not quantum resistant. Like other SHA-2 functions, SHA-384 is not resistant to quantum computing attacks, which is a growing concern in cybersecurity.
Quantum computers are posing a serious challenge to the security of the Bitcoin blockchain. Presently, about 25% of the Bitcoins in circulation are vulnerable to a quantum attack. If you have Bitcoins in a vulnerable address and believe that progress in quantum computing is more advanced than publicly known, then you should probably transfer your coins to a new p2pkh address (don't forget to make a secure backup of your private key). In case your own Bitcoins are safe in a new p2pkh address, you might still be impacted if many people will not (or cannot) take the same protection measures.
In a situation where a large number of Bitcoins is stolen, the price will most likely crash and the confidence in the technology will be lost. Even if everyone takes the same protection measures, quantum computers might eventually become so fast that they will undermine the Bitcoin transaction process. In this case the security of the Bitcoin blockchain will be fundamentally broken. The only solution in this case is to transition to a new type of cryptography called 'post-quantum cryptography', which is considered to be inherently resistant to quantum attacks.
Google quantum researcher Craig Gidney has brought attention to a potentially accelerated timeline for the quantum threat. In May 2025, Gidney suggested that breaking RSA encryption might require significantly fewer quantum resources than previously thought. While Bitcoin doesn't use RSA, it relies on ECC, which is similarly vulnerable to Shor's algorithm. Gidney's research implies that Bitcoin's encryption could be at risk sooner than expected, with a potential threat window between 2030 and 2035, depending on advancements in error correction.
David Carvalho, CEO of Naoris Protocol, issued a more urgent warning in June 2025. He argued that quantum computers might crack Bitcoin within five years unless its cryptography is upgraded quickly.
BlackRock has quietly added a new line to its iShares Bitcoin Trust (IBIT) filing, flagging quantum computing as a potential risk to Bitcoin's long-term security. The filing specifically warns that if quantum tech advances far enough, it could break the cryptographic systems that secure Bitcoin. It could “undermine the viability” of the cryptographic algorithms used not just in digital assets but across the global tech stack.