Many members of the blockchain community have questioned the sufficient decentralization of the Ripple protocol. These doubts were hastened by technical director Ripple David Schwartz. In his opinion, the distributed XRP registry is more decentralized than Bitcoin and Ethereum.
He also stresses that 80% of the mining capacity of bitcoin is concentrated in China. At the same time, 58% of the capacity is in the hands of four groups of miners. Also, three groups of Ethereum miners hold control over 57% of the capacity. At the same time, a group of miners, controlling 51% of the capacity, can conduct an attack on blockchain.
David Schwartz says about Ripple as an example, in which to record the change in blockchain it is necessary that for some time 80% of the validators confirm this change.