Post-quantum signatures for the XRP Ledger, foundation proposes adoption; development to come in the latter half of 2027 or later

The XRPL Foundation has published a market and feasibility study for a proposed but unapproved plan to add the post-quantum signature scheme ML-DSA-44 to the XRP Ledger, covering both account and validator signatures. The implementation has already been demonstrated on a development network, though full deployment is not expected until the second half of 2027 or later. The foundation flagged increased transaction sizes as a key challenge, alongside other open issues. The proposal matters because quantum-resistant cryptography could eventually harden XRP Ledger accounts and validator signing against future quantum threats. What to watch next is whether the proposal gains approval and how developers address the transaction-size tradeoff ahead of the 2027+ timeline.