Ripple and crypto firm Project Eleven are developing a prototype quantum-resistant custody wallet, which is undergoing active testing on validators of the XRP Ledger (XRPL) blockchain.
According to an announcement published this May 19 by the Project Eleven team, the work includes the implementation of post-quantum hybrid signaturesperformance testing on Devnet and a designed escrow architecture to resist quantum computing attacks.
The collaboration is part of Phase 2 of the roadmap posted on April 20 by Ayo Akinyele, Senior Director of Engineering at RippleX. According to Ripple, the goal of this phase, scheduled for the first half of 2026, is to evaluate the full impact of post-quantum cryptography on performance, storage and network bandwidth, and identify necessary architectural adjustments.
The trigger for the initiative, according to the published document, was a recent investigation by Google Quantum AI, reported by CriptoNoticias. It showed that the cryptography used by most cryptocurrency networks today can be violated by sufficiently advanced quantum computers, including the algorithms that protect wallets, sign transactions and safeguard digital assets.
Project Eleven, as a company specialized in post-quantum cryptography, participates in the project in order to build and implement the technical solutions that Ripple requires to complete the transition phases. The signature build a post-quantum hybrid signature proof-of-concept implementationwhich includes validator-level testing, Devnet benchmark testing, and a post-quantum custody wallet prototype.
XRP Ledger, with a structural advantage over other networks
Ripple points out that the XRPL has native capabilities that facilitate migration– Account-level key rotation, allowing users to replace vulnerable keys without changing their account, and seed-based key generation to deterministically derive new cryptographic material. Both capabilities, according to the company, do not exist natively on networks like Ethereum.
Project Eleven, for its part, warns that the risk is not only technical but operational, since it affects each XRP holder and each application built on the network.
The firm also contemplates an emergency scenario called “Q-Day”: if classic cryptography commits before completing the migrationthe XRPL would activate a contingency plan that would prevent the use of classical signatures and allow users to migrate funds through zero-knowledge proofs.
The roadmap also envisions a complete transition to post-quantum signatures as a formal amendment to the XRPL protocol, with a target of 2028. By then, according to Project Eleven, the network will need to process signatures resistant to quantum attacks without compromising its deterministic settlement speed.