Google’s Quantum AI division has issued a stark warning that quantum computers could break the cryptographic systems protecting Bitcoin and other cryptocurrencies by 2029, according to the Times Now. The research, co‑authored with experts from the Ethereum Foundation, Stanford University, and Coinbase, signals one of the most urgent security challenges the crypto ecosystem has ever faced.

What Google’s Researchers Actually Found

Google’s paper states that superconducting quantum computers—the type Google is actively developing—may soon be powerful enough to crack the cryptographic keys that secure:

• Bitcoin wallets
• Ethereum accounts
• Blockchain transactions
• Cross‑chain bridges
• Smart contract signature schemes

Justin Drake of Ethereum Foundation emphasized that such a machine could crack private keys in minutes. This threat is not theoretical anymore. It’s a timeline.

The 2029 Quantum Risk Window

Researchers estimate that cryptographically relevant quantum computers could exist around 2029. This gives the industry a five‑year window to migrate to quantum‑resistant systems.

Even before an actual attack, fear or misinformation about quantum threats could destabilize markets by undermining public confidence.

Why Quantum Computers Break Today’s Crypto

Most blockchains rely on Elliptic Curve Cryptography (ECC) and RSA. These are secure against classical computers but vulnerable to Shor’s algorithm, which quantum machines can use to solve the underlying math exponentially faster.

What becomes vulnerable:

• Wallets that have ever exposed their public key
• Dormant or Satoshi‑era Bitcoin addresses
• Multisig systems
• Validator signatures
• Smart contracts relying on ECC verification

Once a public key is visible, a quantum attacker could derive the private key.

Who’s Behind the Research

The paper includes contributors from:

• Google Quantum AI
• Ethereum Foundation (Justin Drake)
• Stanford University (Dan Boneh)
• Coinbase
• Stanford Institute for Blockchain Research

Google also consulted the U.S. government before publishing.

This is not fringe speculation — it’s a coordinated warning from the top of the cryptography and blockchain research world.

The Path Forward: Post‑Quantum Cryptography (PQC)

Google stresses that post‑quantum cryptography is the solution. These are cryptographic systems designed to resist quantum attacks.

PQC migration challenges:

• Protocol‑level upgrades
• Wallet key rotation
• Exchange and custodian coordination
• Cross‑chain compatibility
• Multi‑year transition timelines

The researchers emphasize that shifting global crypto infrastructure to PQC will require industry‑wide coordination.

What This Means for Bitcoin, Ethereum & the Industry

Bitcoin

• Uses ECDSA signatures
• Public keys become visible after spending
• Billions in dormant coins are exposed
• Governance makes upgrades slow

Ethereum

• Also ECC‑based
• More flexible upgrade pathways
• Researchers already exploring PQC‑ready designs

For Other Blockchains

• Bridges, L2s, and smart contracts must be redesigned
• Custodians must rotate keys
• Users must eventually migrate wallets

Quantum computing is no longer a distant threat. Google’s research places a clear deadline on the crypto industry: upgrade or risk catastrophic key‑breaking attacks by 2029.