Apr 9, 2026 upd. 8 Jun

XRPL testnet adopts post-quantum signatures; only 0.03% XRP at risk

XRPL testnet adopts post‑quantum signatures; two exposed dormant accounts hold 21M XRP

XRPL’s developer testnet went quantum‑secure in December 2025. On mainnet, only two long‑inactive accounts with exposed keys hold sizable balances.

A validator’s check shows ~300,000 accounts never transacted. Their public keys remain hidden. They hold about 2.4 billion XRP. Source: validator summary and thread on X.

Most other accounts have visible public keys. Classical attacks can’t break them today. Quantum machines strong enough to do so do not exist yet. The warning window is open. Source: validator thread on X.

Only two dormant accounts exceed the threshold. Both are inactive for 5+ years with exposed keys. Combined balance is ~21 million XRP, or ~0.03% of supply. Source: validator thread on X.

XRPL sits differently from Bitcoin. Old Bitcoin P2PK wallets expose public keys. Satoshi‑linked wallets fall in this bucket. Source: context on Satoshi holdings from The New York Times.

XRPL offers built‑in key rotation. Users can swap signing keys without changing addresses. Protocol upgrades pass through an on‑chain amendment vote by validators. Source: XRPL docs xrpl.org.

Quantum timelines remain uncertain. Google‑adjacent research suggests the break could come sooner than expected for legacy schemes. Source: Forbes.

AlphaNet signals the path forward. In Dec 2025, it implemented ML‑DSA (CRYSTALS‑Dilithium), a NIST‑approved post‑quantum signature. Source: standard overview DigiCert on ML‑DSA.