The recent discussions around quantum computing have brought attention to the potential threats it poses to legacy blockchains. Experts suggest that XRP's architecture may be better equipped to handle these risks than Bitcoin's. The XRP Ledger, a decentralized blockchain, is the foundation for the XRP digital token, which is used by fintech firm Ripple for cross-border transactions.
Let's examine the details. The primary concern is that a powerful quantum computer could potentially reverse-engineer a private key from an exposed public key, allowing an attacker to drain funds. Typically, a public key is exposed when a transaction is sent, making the account activity a determining factor in quantum vulnerability.
A recent audit of the XRP Ledger found that approximately 300,000 accounts, holding 2.4 billion XRP, have never sent funds and are therefore quantum-safe by default. In contrast, dormant whale accounts that have transacted in the past and exposed their public keys are at risk. However, these accounts hold only 0.03% of the circulating supply.
The XRP Ledger's key rotation feature allows users to swap their signing key without moving funds, providing an additional layer of protection. Mayukha Vadari, a staff software engineer at Ripple, highlighted the escrow feature as another defense against quantum risk, as funds locked in escrow with a time lock are safe due to logic rather than cryptography. In comparison, Bitcoin's quantum threat appears more severe due to its larger scale and lack of key rotation feature. Approximately 6.9 million BTC, nearly 35% of Bitcoin's circulating supply, are vulnerable to quantum attacks.
While Bitcoin developers have proposed initiatives to develop quantum resistance, XRP's existing features may provide stronger protection against these threats.