The rise of quantum computing has sparked concerns about the potential risks to blockchain security. Experts suggest that XRP's architecture may be better equipped to withstand these threats than Bitcoin's. XRP operates on the XRP Ledger, an open-source, decentralized blockchain that facilitates cross-border transactions through Ripple, a fintech company.
Let's examine the issue in detail. The primary concern is that a powerful quantum computer could potentially reverse-engineer private keys from exposed public keys, thereby draining funds. Typically, public keys are exposed when sending transactions, while receiving funds only exposes the wallet address. XRP Ledger's validator, Vet, conducted a quantum vulnerability audit, finding around 300,000 XRP accounts with 2.4 billion XRP that have never sent funds and are thus quantum-safe by default.
However, dormant whale accounts that have transacted in the past are exposed, with two such accounts holding 21 million XRP, approximately 0.03% of the circulating supply. The XRP Ledger's account-based system and key rotation feature allow users to swap signing keys without moving funds, reducing vulnerability. Mayukha Vadari, a staff software engineer at Ripple, also pointed to the escrow feature as a defense against quantum risk, as time locks prevent withdrawal until a specified time has passed. In comparison, Bitcoin's quantum threat appears more severe due to its larger scale and the use of P2PK format, which exposed public keys directly in transaction outputs.
Approximately 6.9 million BTC, nearly 35% of Bitcoin's circulating supply, are vulnerable, including Satoshi Nakamoto's 1 million BTC. Bitcoin holders face a structural problem, as the blockchain lacks a key rotation feature, leaving them with only one option: moving funds to a new address, which still exposes the public key of the old address. While Bitcoin developers have proposed quantum resistance solutions, XRP's unique features may provide an advantage in terms of security against quantum computing threats.