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Google’s March 30 whitepaper rattled the crypto market but reframed a question the industry has been asking wrong for years.
The research from Google’s Quantum AI team found that cracking Bitcoin’s elliptic curve cryptography could require fewer than 500,000 physical qubits – a 20-fold reduction from previous estimates.
A sufficiently powerful quantum computer could derive a private key in roughly nine minutes, faster than Bitcoin’s average ten-minute block confirmation. Around 6.9 million BTC, whose public keys are already exposed, sit in the crosshairs. Bitcoin’s Taproot upgrade, which makes public keys visible by default, has widened that exposure further.
The response across crypto X was swift.
“Post-quantum is no longer a drill,” wrote Haseeb Qureshi of Dragonfly.
Quantum Kills Bitcoin. And Your Bank. And SWIFT. And Every Website You Use.
That’s where the counterargument comes in, and it’s a fair one.
Bitcoin doesn’t have a unique quantum problem. It has the same quantum problem as every other system running on elliptic curve cryptography, which is most of the internet. SWIFT transfers, stock exchanges, banking infrastructure, military communications – all secured by the same underlying math.
If a quantum computer can crack a Bitcoin wallet, it can read your bank’s encrypted traffic just as easily.
Why Bitcoin’s Quantum Problem Is Different
Google’s paper addresses this directly, and the answer is uncomfortable for Bitcoin specifically. Centralized systems – banks, SWIFT, governments – can push software updates overnight. Bitcoin cannot.
SWIFT is already working on post-quantum protection. U.S. federal agencies have been mandated to be quantum-safe by 2035. Google is targeting 2029 for its own systems.
Bitcoin has no equivalent authority.
BIP 360, the leading quantum-resistance proposal, is running on testnet. But a full migration to post-quantum signatures, the necessary next step, would mean signatures 10 to 100 times larger than what Bitcoin currently uses, dramatically reducing how many transactions fit in each block.
CZ laid out the challenge plainly: “It’s hard to organize upgrades in a decentralized world. There will likely be many debates on which algorithm(s) to use, resulting in some forks.“
He also raised something nobody else had – what happens to Satoshi’s Bitcoin? If those coins don’t migrate to quantum-resistant wallets, they become a sitting target for the first quantum attacker who gets there.
Also Read: CertiK’s March Report Reveals Biggest Crypto Threats as Kraken User Loses $18.2M
Harvest Now, Decrypt Later
The most immediate threat isn’t a quantum computer cracking wallets today. It’s the harvest now, decrypt later strategy – adversaries collecting encrypted data now, planning to decrypt it once the hardware catches up. For the millions of Bitcoin with already-exposed keys, that process may have started.
Eli Ben-Sasson of StarkWare put the right frame on it: “FUD is claiming Bitcoin can’t adapt. It can adapt. Just need to start working on these solutions today.”
The question is whether Bitcoin’s community moves faster than the hardware does.