Bitcoin (BTC) would outlast the banking system in a quantum attack, billionaire investor Tim Draper argued, even with roughly 25% of the coin's supply sitting in exposed addresses.
Key Points:
- Tim Draper says quantum computers will break into banks well before they can touch Bitcoin.
- Bitcoin's full transparency leaves no hidden archive for a "harvest now, decrypt later" raid.
- Bitcoin's signature flaw has a proposed fix, while banks lean on government deadlines.
Tim Draper Backs Bitcoin
Draper laid out the case in a post on X. He said quantum machines would hack banks long before they could touch the blockchain, blaming the legacy infrastructure that underpins most financial institutions. Bitcoin, by contrast, could fork back to its last secure block, a rollback that would demand broad consensus and sit awkwardly against the network's promise of immutability.
Researchers call the bank threat harvest now, decrypt later, where attackers collect encrypted records today and wait for future machines able to read decades of confidential financial history in one stroke. Bitcoin carries no such hidden trove, because every transaction, address and balance already sits in plain view on the public ledger.
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Experts Weigh Bitcoin's Fix
Bitcoin still carries one genuine quantum risk. Its ECDSA signature system, the code that authorizes spending, leaves an exposed public key on every address that has ever sent coins out. A quantum computer running Shor's algorithm could in theory trace that key back to the private one, a risk that compounds with every address reused over time.
SHA-256, the function that guards mining, stays beyond reach for decades.
A March 2026 paper from Google Quantum AI lowered the bar for breaking the ECDSA standard to fewer than 500,000 physical qubits, roughly a 20-fold drop from earlier 2019 estimates. For now, the attack stays years away. The flaw still has a community answer in BIP-360, which adds post-quantum signatures backed by U.S. standards body NIST and already demonstrated by developers on a testnet.
Banks have no such self-rule. Security chief Jameson Lopp has estimated that about 4 million Bitcoin, nearly a quarter of supply, already carry exposed keys, even as some analysts argue centrally run banks could upgrade faster than Bitcoin.
Draper's stance fits a long record. He first bought into the asset near $4, then lost his early holdings in the Mt. Gox collapse before rebuilding through a 2014 auction of seized coins. He has brushed off quantum warnings for years, casting the danger as a problem for banks to confront first.
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