Google's 2029 Quantum Deadline Forces Crypto to Rethink Security

Google researchers in March published a report warning that quantum computers capable of breaking the encryption protecting crypto transactions could arrive by 2029. That timeline is roughly a decade earlier than previous estimates. The crypto sector has begun preparing, according to a Reuters report Wednesday.

The threat is existential, said Chris Tam, head of quantum innovation at BTQ Technologies.

"It's the most direct and existential threat towards cryptocurrencies and crypto networks."

Public blockchains face a structural disadvantage compared to traditional finance. Banks can quietly upgrade their cryptographic infrastructure behind closed doors. Blockchains require consensus across a distributed network of nodes, making any cryptographic transition a years-long coordination problem. Google's own analysis noted that the transparency and immutability of blockchains make them harder to patch.

The 2029 Deadline

Citigroup and other researchers have concluded that advances in artificial intelligence are shortening the window further. The combination of quantum computing and AI could accelerate the vulnerability timeline, the Reuters report said.

President Trump last month signed executive orders to strengthen U.S. quantum capability while acknowledging the risks. In May, the Commerce Department announced $2.013 billion in federal incentives to nine companies for quantum computing projects.

Some crypto firms and blockchain developers have started working on quantum-resistant cryptography, known as post-quantum cryptography or PQC. The effort could mean sweeping changes to the infrastructure of digital assets.

The upgrade is not optional. If quantum computers arrive by 2029, every blockchain that has not migrated to PQC risks having its private keys derived from public keys. That would allow attackers to drain wallets and counterfeit transactions. The market, valued at roughly $2 trillion, has a history of hacks even without quantum capability. For broader context on the crypto market, the sector has already faced billions in losses from exchange breaches and protocol exploits.

Google's researchers recommended that the crypto community begin transitioning to PQC now, before the technology matures. No date has been set for a coordinated industry migration.