Ripple CTO Emeritus David Schwartz explained how the XRP Ledger uses the Negative Unique Node List, or Negative UNL, to keep the network running when trusted validators go offline.
The discussion followed renewed debate about XRPL’s architecture after Charles Hoskinson described the design as “very elegant.”
Schwartz said the XRP Ledger needs a mix of strong professional validators and smaller independent operators. He explained that larger companies often have better uptime because they can afford stronger servers, backup systems, and technical support teams.
According to XRPL.org, the Negative UNL is a list of trusted validators that are believed to be offline or not functioning correctly. When validators on the list stop responding, the rest of the network can temporarily ignore them when deciding whether enough support exists to approve a new ledger.
However, the system does not permanently remove those validators. If a validator comes back online and starts sending matching validation votes again, it can later be removed from the Negative UNL.
Schwartz said an important part of the system is that validators placed on the Negative UNL do not completely lose their influence. Even during an outage, they can still have a role in transaction ordering, fee voting, and amendment voting across the network.
XRPL documentation describes a UNL as a group of validators trusted not to work together maliciously. The network also recommends that validators come from independent groups such as businesses, universities, organizations, and individuals.
The debate comes as the XRP Ledger ecosystem prepares for more technical upgrades. Developers are currently working on native lending features and programmable escrow tools designed to expand XRPL beyond payments and settlements.
Ripple is also preparing a four-phase roadmap aimed at protecting XRPL against future quantum computing risks by 2028. The plan includes testing in 2026, validator reviews, custody prototypes, and a final network amendment.
The discussion around validators is also happening during a busy period for XRP. Recent market data showed that XRP wallets holding at least 10,000 tokens reached a record 332,230, based on data shared by Santiment on X.
At the same time, XRP open interest on Binance reportedly climbed to around $475.4 million, moving above its 30-day average as traders watched the $1.45 to $1.50 resistance range.
