How could quantum computing threaten crypto, and what are chains doing about it?

[nihalsari]

Most blockchain security relies on elliptic curve cryptography (ECC).
Quantum computers running Shor’s algorithm could, in theory, break ECC by efficiently solving the discrete logarithm problem—allowing attackers to derive private keys from public keys.

This threat is not immediate but is serious enough that NIST and other agencies are standardizing post-quantum cryptography (PQC).
Projects like QANplatform, Algorand, and Cardano research are already testing quantum-resistant signature schemes such as lattice-based algorithms.

For users and developers:

Use addresses derived from hashed public keys (e.g., Bitcoin’s P2PKH) to reduce exposure.

Support chains adopting NIST-approved PQC algorithms like ML-DSA-65.

Plan migration paths for smart contracts that must remain secure for decades.

Quantum resistance is a long game, but those who plan ahead will protect long-lived assets like cold-stored BTC or institutional treasuries.

[Nahid10]

Quantum computing might still be years away from breaking ECC, but crypto projects preparing now will be the ones that survive the next wave of tech disruption.

[jacson4]

Most users don’t realize their cold-stored BTC today could be vulnerable in 10–20 years. Planning migration paths for long-term assets is critical. ️

[kelson10]

I think NIST’s PQC standards will reshape blockchain security. The real winners will be the chains that adopt lattice-based algorithms early.

[JanEmil]

SSL (The Internet) will be cracked first.