The recent discussions around quantum computing have sparked concerns about the potential risks to legacy blockchains. Experts suggest that XRP's architecture may be better equipped to handle these threats than Bitcoin's. The XRP Ledger, an open-source and decentralized blockchain, is used by fintech firm Ripple for cross-border transactions.
Let's break down the details step by step. 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, and the account activity makes it vulnerable to quantum attacks, not the balance or the age of the address. A recent audit of the XRP Ledger found that around 300,000 accounts holding 2.4 billion XRP have never sent any funds and are therefore quantum-safe by default.
However, there are dormant whale accounts that have transacted in the past and exposed their public keys, making them vulnerable to quantum attacks. The XRP Ledger's key rotation feature allows users to swap their signing key without moving funds, making it a valuable tool for mitigating quantum risks.
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, the quantum threat to Bitcoin appears more significant due to the sheer scale of vulnerable coins and the lack of a key rotation feature, leaving holders with limited options to protect their funds.