Which Cryptocurrencies Will Survive Quantum Computing

The quantum threat to Bitcoin gets the headlines, but it is not a Bitcoin problem. Almost every cryptocurrency signs transactions with elliptic curve mathematics that a large quantum computer would unravel, whether that is the ECDSA behind Bitcoin or the Ed25519 behind most newer chains. The question of a quantum resistant cryptocurrency is really a question about the whole market, and the honest answer in 2026 is that almost none of the coins people actually hold are protected yet. Building a quantum resistant cryptocurrency is now on the agenda of most serious projects, but agendas are not mainnet code. This guide maps the field. It explains why the threat is shared, lays out in one table exactly what each major cryptocurrency is doing about it, and separates the projects that have shipped a genuinely quantum resistant cryptocurrency from the ones that have only published roadmaps or slogans. For the Bitcoin-specific version of this story, our companion guide on bitcoin and quantum computing goes deeper on that one chain. Only one major chain protects user funds against quantum attacks by default. Most are still on roadmaps. Key Takeaways The threat is shared across chains. Both ECDSA and Ed25519, which between them…