A $150B Crypto Time Bomb? How Quantum Computing Could Rewrite Bitcoin Security
Quantum computing is moving from theory to practice, and a
new whitepaper warns that major cryptocurrencies need to react much faster than
they have so far. The study shows that once a powerful enough quantum computer
exists, it could break the cryptography behind Bitcoin, Ethereum and other
chains in minutes, putting both long‑dormant and active assets at risk.
Singapore Summit: Meet the largest APAC brokers you know (and those you still don’t!)
Google Quantum AI released a whitepaper, warning that around
2.3 million dormant, vulnerable BTC could become a multi‑billion‑dollar
prize the moment a powerful quantum machine comes online.
Simply, this new research says that once powerful quantum
computers arrive, they will be able to “guess” some old Bitcoin keys fast
enough to move coins that nobody can currently access, turning a huge pool of
forgotten BTC into a prize for whoever gets the technology first.
Google Quantum AI released a whitepaper warning that cracking 256-bit ECC, widely used in crypto wallets, requires fewer resources than expected. With under 500k physical qubits, it could be cracked in minutes. Google urged the industry to accelerate its migration to Post-Quantum… pic.twitter.com/DpdSPmYhYc
— Wu Blockchain (@WuBlockchain) March 31, 2026
Technically, the paper estimates that a future “fast‑clock” quantum computer with fewer than 500,000 physical qubits
could use Shor’s algorithm to break Bitcoin’s 256‑bit elliptic curve in about nine minutes from a primed
state.
That speed is comparable to Bitcoin’s
average 10‑minute block time, meaning an attacker could
potentially intercept some pending transactions and redirect funds before they
confirm.
Read more: Quantum Computing and Payment Security
Google’s team showed, on paper, that you no longer need a
sci‑fi‑level
quantum supercomputer to break the math that protects Bitcoin and Ethereum. You
“just”
need a realistically sized, next‑generation machine, and once that
exists an attacker could watch the network, grab your public key while your
transaction sits waiting to be confirmed, and mathematically recover your
private key fast enough to steal the coins before they hit a block.
Vitalik Buterin warned at the Devconnect conference that elliptic curve cryptography could be broken by quantum computing before the 2028 U.S. presidential election, urging Ethereum to upgrade to quantum-resistant cryptography within four years. He also stated that future…
— Wu Blockchain (@WuBlockchain) November 19, 2025
“Here is the terrifying part: When you send Bitcoin, your
public key is exposed in the “mempool” for about 10 minutes before
the transaction is confirmed in a block,” according to Simplifying AI.
“Google’s researchers compiled a quantum circuit that can
theoretically derive your private key from that exposed public key in roughly 9
minutes.”
Industry Outlook: From FUD to Forced Migration
The whitepaper argues that full migration to post‑quantum
cryptography is technically clear but politically and operationally difficult.
Post‑quantum
signatures are larger and heavier, so upgrades would raise bandwidth and
storage needs and almost certainly reopen old governance fights, especially in
Bitcoin.
“Pull your cryptographic inventory. Flag every ECC-256
implementation on high-value assets. Identify every system where the algorithm
is hardcoded rather than configurable. Those are your agility gaps and your
longest-lead-time risk,” commented Cory Missimore, AI Governance expert.
Cory Missimore, Source: LinkedIn
At the same time, leaving dormant assets untouched invites a
race between criminals, states and possibly regulated “digital salvage”
operators seeking legal rights to recover and liquidate compromised coins.
Interestingly, Ethereum co-founder, Vitalik Buterin, shares similar views. He recently told developers that the kind of
cryptography Ethereum uses today might be breakable by quantum computers sooner
than many expect, possibly even before the 2028 U.S. election, so the network
should move to quantum‑resistant cryptography within about four years.
At the same time, he argued that most new experimentation
should happen on Layer 2s, in wallets and in privacy tech, while keeping the
base layer as simple and stable as possible.
Quantum computing is moving from theory to practice, and a
new whitepaper warns that major cryptocurrencies need to react much faster than
they have so far. The study shows that once a powerful enough quantum computer
exists, it could break the cryptography behind Bitcoin, Ethereum and other
chains in minutes, putting both long‑dormant and active assets at risk.
Singapore Summit: Meet the largest APAC brokers you know (and those you still don’t!)
Google Quantum AI released a whitepaper, warning that around
2.3 million dormant, vulnerable BTC could become a multi‑billion‑dollar
prize the moment a powerful quantum machine comes online.
Simply, this new research says that once powerful quantum
computers arrive, they will be able to “guess” some old Bitcoin keys fast
enough to move coins that nobody can currently access, turning a huge pool of
forgotten BTC into a prize for whoever gets the technology first.
Google Quantum AI released a whitepaper warning that cracking 256-bit ECC, widely used in crypto wallets, requires fewer resources than expected. With under 500k physical qubits, it could be cracked in minutes. Google urged the industry to accelerate its migration to Post-Quantum… pic.twitter.com/DpdSPmYhYc
— Wu Blockchain (@WuBlockchain) March 31, 2026
Technically, the paper estimates that a future “fast‑clock” quantum computer with fewer than 500,000 physical qubits
could use Shor’s algorithm to break Bitcoin’s 256‑bit elliptic curve in about nine minutes from a primed
state.
That speed is comparable to Bitcoin’s
average 10‑minute block time, meaning an attacker could
potentially intercept some pending transactions and redirect funds before they
confirm.
Read more: Quantum Computing and Payment Security
Google’s team showed, on paper, that you no longer need a
sci‑fi‑level
quantum supercomputer to break the math that protects Bitcoin and Ethereum. You
“just”
need a realistically sized, next‑generation machine, and once that
exists an attacker could watch the network, grab your public key while your
transaction sits waiting to be confirmed, and mathematically recover your
private key fast enough to steal the coins before they hit a block.
Vitalik Buterin warned at the Devconnect conference that elliptic curve cryptography could be broken by quantum computing before the 2028 U.S. presidential election, urging Ethereum to upgrade to quantum-resistant cryptography within four years. He also stated that future…
— Wu Blockchain (@WuBlockchain) November 19, 2025
“Here is the terrifying part: When you send Bitcoin, your
public key is exposed in the “mempool” for about 10 minutes before
the transaction is confirmed in a block,” according to Simplifying AI.
“Google’s researchers compiled a quantum circuit that can
theoretically derive your private key from that exposed public key in roughly 9
minutes.”
Industry Outlook: From FUD to Forced Migration
The whitepaper argues that full migration to post‑quantum
cryptography is technically clear but politically and operationally difficult.
Post‑quantum
signatures are larger and heavier, so upgrades would raise bandwidth and
storage needs and almost certainly reopen old governance fights, especially in
Bitcoin.
“Pull your cryptographic inventory. Flag every ECC-256
implementation on high-value assets. Identify every system where the algorithm
is hardcoded rather than configurable. Those are your agility gaps and your
longest-lead-time risk,” commented Cory Missimore, AI Governance expert.
Cory Missimore, Source: LinkedIn
At the same time, leaving dormant assets untouched invites a
race between criminals, states and possibly regulated “digital salvage”
operators seeking legal rights to recover and liquidate compromised coins.
Interestingly, Ethereum co-founder, Vitalik Buterin, shares similar views. He recently told developers that the kind of
cryptography Ethereum uses today might be breakable by quantum computers sooner
than many expect, possibly even before the 2028 U.S. election, so the network
should move to quantum‑resistant cryptography within about four years.
At the same time, he argued that most new experimentation
should happen on Layer 2s, in wallets and in privacy tech, while keeping the
base layer as simple and stable as possible.
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