What about quantum computing? Are my BCH safe?
As of early 2026, the BCH community is rolling out quantum solutions while the BTC community stay trapped in vulnerability due to their lack of upgrades and propaganda.
Quantum computing has not developed enough to be a short term (2026 or earlier) threat to Bitcoin. In the medium term (2027 - 2035), it will become a non-trivial but manageable issue (at least for the BCH community).
BCH Quantum preparation
Upgrading with defences against quantum computing are currently underway in the BCH community. Protcol upgrades such as CashTokens, Velma & Layla have improved BCH scripting to the point that quantum-secure transaction protections can be implemented.
As of May 2025, Jason Dreyzehner has released a production ready quantum resistant vault for BCH, with increases in efficiency active after the May 2026 Layla upgrade. Integration into wallet tooling is expected also by May 2026, with rollout to wallets to follow. The BCH community can then begin migrating active and cold storage coins to quantum safety ahead of any quantum computer attacks.
Other quantum solutions have also been prototyped on BCH, for instance Lamport signatures by moonsettler as part of the BCH Blaze hackathon.
There is of course further research and discussion ongoing here by the Bitcoin Cash community.
Users should rest easy the problem is being addressed with known pragmatic solutions, but maintain an eye on BCH media in case a migration of coins to quantum secure technology becomes necessary or available.
BTC Quantum vulnerability
Quantum secure solutions is one of the many things BCH has that BTC wants (but can't get). Unlike the BCH community, the BTC community do not have access to the necessary protocol upgrades to build quantum-resilient wallets. This is of course the result of the Hijacking and propaganda endemic in their development ecosystem.
If anything, they've actually made the problem worse for themselves. Taproot formatted addreses (an ""upgrade"" which BCH does not have), are extra-vulnerable to quantum computing. Such is the result of an incompetent dev community.
Even if the BTC community do come up with some unlikely solution to their predicament (and whether or not they can coordinate to implement it, which is also doubtful), BCH is perfectly poised to benefit. Similar to the question of hashrate, BCH has a giant advantage over most other cryptocurrencies by virtue of its sibling ancestry with Bitcoin "Core" BTC. Any research or solutions emerging in the BTC community will of-necessity be open-sourced & so can be easily replicated or improved on by the BCH community.
Address Reuse
Best practice is to use a fresh Bitcoin address for each transaction. Not only is this beneficial for increasing privacy of the entire chain, but it also protects unspent coins against quantum attack.
Mining
According to the research article Quantum Attacks on Bitcoin, and How to Protect Against Them, quantum computing is not a medium term threat to SHA256 miners.
In fact, the researchers found that ASICs (which do not centralise the network) were actually a security boon against the arrival of quantum computing.
3.1. Attacks on the Bitcoin Proof-of-Work—In this section, we investigate the advantage a quantum computer would have in performing the hashcash PoW used by Bitcoin. Our findings can be summarized as follows: Using Grover search,8 a quantum computer can perform the hashcash PoW by performing quadratically fewer hashes than is needed by a classical computer. However, the extreme speed of current specialized ASIC hardware for performing the hashcash PoW, coupled with much slower projected gate speeds for current quantum architectures, essentially negates this quadratic speedup, at the current difficulty level, giving quantum computers no advantage. Future improvements to quantum technology allowing gate speeds up to 100GHz could allow quantum computers to solve the PoW about 100 times faster than current technology. However, such a development is unlikely in the next decade, at which point classical hardware may be much faster, and quantum technology might be so widespread that no single quantum enabled agent could dominate the PoW problem.