Schwartz, McCaleb and Britto replaced mining with chosen trust
David Schwartz, Jed McCaleb and Arthur Britto began work in 2011 on a ledger that could settle value without proof-of-work mining. By June 2012 the XRP Ledger was live. Its servers did not race for a block reward; each listened to validators on a chosen Unique Node List and compared proposals until a supermajority agreed on the next state.
That design moved power away from miners without making trust disappear. A server operator chooses its list, but safety depends on strong overlap with the lists other operators use. Ripple and the XRP Ledger Foundation publish the two recommended lists used by default configurations, so publishers influence which independent validators receive broad trust even though they do not approve transactions themselves.
