Europol just published a quantum warning for crypto, and the headline is not "Bitcoin is broken".
The report from Europol's European Cybercrime Centre, released Oct 7, makes a narrower and more useful point: the blockchain is not the weak spot. The keys are.
What it says:
- The hash functions that secure blockchain history and mining hold up far better against quantum attacks than the public-key cryptography that controls wallets.
- Once an address has sent funds, its public key sits on-chain. A future quantum computer could work backward from it to the private key.
- About 6.9M $BTC sit in addresses with exposed public keys, including early and long-dormant wallets. Glassnode's May estimate was 6.04M, roughly 30% of supply.
- Keys that are already exposed can't be fixed after the fact. The only protection is moving those funds before a capable machine exists.
And the reassuring part: those machines don't exist yet, and Europol didn't predict when they will. Its verdict is "proactive adaptation, rather than systemic collapse".
The hard part is the migration. Post-quantum signatures can be 10 to 120 times larger than Bitcoin's current ECDSA signatures, which means bigger transactions, higher fees and a long, political upgrade debate. And lost or forgotten coins, like many early wallets, will never be moved by anyone.
So the real question isn't if Bitcoin survives quantum. It's what happens to millions of coins nobody can move in time.
Should Bitcoin freeze vulnerable coins someday, or leave them to whoever cracks them first?
Like and follow for security news without the doom headlines.
#Quantum #Bitcoin
The report from Europol's European Cybercrime Centre, released Oct 7, makes a narrower and more useful point: the blockchain is not the weak spot. The keys are.
What it says:
- The hash functions that secure blockchain history and mining hold up far better against quantum attacks than the public-key cryptography that controls wallets.
- Once an address has sent funds, its public key sits on-chain. A future quantum computer could work backward from it to the private key.
- About 6.9M $BTC sit in addresses with exposed public keys, including early and long-dormant wallets. Glassnode's May estimate was 6.04M, roughly 30% of supply.
- Keys that are already exposed can't be fixed after the fact. The only protection is moving those funds before a capable machine exists.
And the reassuring part: those machines don't exist yet, and Europol didn't predict when they will. Its verdict is "proactive adaptation, rather than systemic collapse".
The hard part is the migration. Post-quantum signatures can be 10 to 120 times larger than Bitcoin's current ECDSA signatures, which means bigger transactions, higher fees and a long, political upgrade debate. And lost or forgotten coins, like many early wallets, will never be moved by anyone.
So the real question isn't if Bitcoin survives quantum. It's what happens to millions of coins nobody can move in time.
Should Bitcoin freeze vulnerable coins someday, or leave them to whoever cracks them first?
Like and follow for security news without the doom headlines.
#Quantum #Bitcoin