Key takeaways
- Existing hardware wallets successfully generated experimental quantum-resistant signatures
- Blockstream's SHRINCS technology could support future Bitcoin security
- Bitcoin still needs network upgrades before becoming quantum-resistant
Could the Bitcoin hardware wallet you already own protect your cryptocurrency from future quantum computers? New research suggests existing devices may be more adaptable than previously thought.
In its November 5 research update, Bitcoin infrastructure company Blockstream highlighted experiments showing that hardware wallets from Ledger, Trezor, BitBox and its own Jade lineup can generate post-quantum signatures without requiring entirely new hardware.
How Quantum Computers Could Threaten Bitcoin
Bitcoin uses elliptic-curve cryptography to authorize transactions. Digital signatures prove that someone controls the private key associated with the coins being spent.
A sufficiently powerful quantum computer running Shor's algorithm could theoretically derive private keys from exposed public keys, potentially allowing attackers to steal funds.
However, today's quantum computers are not known to possess the capabilities needed to break Bitcoin's production cryptography.
The threat also varies between wallet types. Some Bitcoin addresses conceal public keys behind hashes until coins are spent, while older addresses and certain modern output types expose public keys directly.
Researchers have previously disagreed over the scale of Bitcoin's quantum vulnerability, particularly regarding older coins and the likelihood of powerful quantum computers emerging soon.
The challenge is therefore preparing Bitcoin's security infrastructure before such machines become practical.
Researchers Test Quantum-Resistant Signatures on Existing Wallets
Blockstream's original August 19 experiment evaluated five hash-based signature schemes across several hardware wallet models.
The devices included Jade Plus, Trezor Safe 3, 5 and 7, two Ledger models and BitBox02 Nova.
Every tested device successfully generated post-quantum signatures using the experimental implementations.
A compact SHRINCS configuration producing 324-byte signatures required approximately 22–42 seconds to sign, with Jade Plus recording 21.75 seconds.
Although substantially slower than ordinary Bitcoin signatures, these results suggest that existing hardware can perform cryptographic operations designed to resist future quantum attacks.
The findings complement broader hardware-wallet security improvements, but the tests did not establish complete quantum-resistant firmware or wallet functionality.
What Bitcoin Needs Before It Becomes Quantum-Resistant
Blockstream's proposed SHRINCS system uses hash-based signatures instead of relying on the elliptic-curve mathematics vulnerable to sufficiently advanced quantum computers.
Its compact design addresses another important limitation: quantum-resistant signatures are often substantially larger than Bitcoin's existing signatures, potentially increasing transaction costs and consuming more block space.
Researchers have already submitted a draft Bitcoin Improvement Proposal describing SHRINCS and its reference implementation.
However, Bitcoin developers must still evaluate its security, implementation requirements, transaction costs and compatibility with existing infrastructure.
Other proposals take different approaches, including plans to migrate or eventually restrict quantum-vulnerable coins.
Meanwhile, recent advances in quantum computing have intensified discussion about how quickly Bitcoin should prepare for the transition.