Is Bitcoin Quantum Safe?

Is Bitcoin Quantum Safe? The Honest Answer

Short Answer: No

Bitcoin is not quantum safe. Bitcoin relies on Elliptic Curve Digital Signature Algorithm (ECDSA) for transaction signing and Elliptic Curve Diffie-Hellman (ECDH) for key exchange. Both are vulnerable to quantum computers running Shor's algorithm.

How Bitcoin Would Be Attacked

1. Every time you send Bitcoin, your public key is revealed on-chain
2. Any address that has ever sent Bitcoin has an exposed public key
3. A quantum computer running Shor's algorithm derives the private key from the public key
4. The attacker empties the wallet

How Much Bitcoin Is Vulnerable?

Estimates suggest ~4 million BTC sits in addresses that have revealed their public keys. At current prices, that's hundreds of billions of dollars potentially accessible to a quantum attacker.

Additionally, "Pay-to-public-key" (P2PK) format addresses — used by Satoshi — expose public keys permanently. Satoshi's estimated 1.1 million BTC is entirely in P2PK format.

Does Bitcoin Have a Quantum Fix?

The Bitcoin community has discussed quantum resistance for years but has reached no consensus on a solution. Implementing PQC in Bitcoin would require:

• A hard fork (contentious, takes years)
• All users to move funds to new PQC addresses (coordination nightmare)
• Significantly larger transaction sizes (scalability impact)

What This Means for BMIC

Bitcoin's quantum vulnerability creates enormous demand for quantum-safe alternatives. BMIC is purpose-built to be quantum-safe from day one — implementing NIST FIPS 203/204/205 before the quantum threat materialises, not after.

BMIC wallets protect assets that might be moved out of vulnerable Bitcoin addresses as quantum computing advances.