The quantum threat is approaching fast and traditional elliptic curves will soon lose their usefulness in the face of Shor’s algorithm.
I am curious whether within the planned work on the protocol you are considering implementing native quantum resistance directly in the transaction layer or if this topic is completely omitted in the current roadmap.
How do you plan to solve that problem of public key compromise without drastically increasing transaction sizes.
Any IDEA???
Or maybe We can create a new blockchain where all developers can develop solutions and deploy them to BCH.
2 Likes
Welcome to BCH research!
You can read more of Quantum discussion & ideas in these two threads: Post Quantum Cryptography and CHIP-2026-06: Post-Quantum and Hybrid Signatures
In particular, you might be interested in Quantumroot, which is a quantum secure vault application. It was announced many months ago, and is now already active on mainnet after the Layla upgrade in May 2026 - but there hasn’t been any new announcements about it. Read more here: Post-quantum vaults are live on Bitcoin Cash's Chipnet
In any case, the summary is: BCH Script is already so advanced that you can make quantum secure signatures at the same or only slightly larger sizes as existing transactions. We don’t need a new blockchain, or any more protocol upgrades. People can just build quantum wallets with the existing tech and roll them out to users who want to be prepared for that issue. That said, I’m sure if you look into all of the existing stuff and find a gap or problem that COULD be solved by a protocol upgrade, the community will also consider that.
This thread might be worth closing as a duplicate?
2 Likes
It’s already implemented, smart contracts are advanced enough to implement QC-resistant wallets.
Thanks to smart contracts and native tokens we can do with OTS schemes which are lighter than stateless schemes. See Quantumroot PoC.
Not all addresses are equally vulnerable. Those where key hasn’t been reused (P2PKH) will likely be safe for a while and those can be migrated safely post q-day. Best we can do for those with already exposed keys is create a scheme to give real owners some edge: Quantum-Resistant Bitcoin Cash: A Challenge-Based Transition Protocol so they can effectively create a secret “dibs” for their pubkeys now, and be able to show it later if QC would threaten them.
We’re also looking into adding some stateless PQC scheme to OP_CHECKSIG so that we may have a drop-in replacement for ECDSA/Schnorr: CHIP-2026-06: Post-Quantum and Hybrid Signatures - #3 by bitcoincashautist
1 Like