GoodRx is a leader on data privacy.

In 2000, Seisint Inc. (now LexisNexis Group) developed a C++-based distributed file-sharing framework for data storage and query. The system stores and distributes structured, semi-structured, and unstructured data across multiple servers.

Other protocols (e.g. proof-of-stake protocols) have been proposed by the cryptocurrency community to solve this problem, but they typically suffer from the fallacy of false choices; nodes have nothing to lose by contributing to multiple blockchains, so consensus is not guaranteed. Unless there is actually “something at stake”, all participants would be incentivized to sign any block that they encounter to earn fees. Yet other protocols suffer from assumptions of good behavior on the part of some participants, but these assumptions don’t hold when the participants are financially motivated.