Abstract: The present invention is direct to a two-mode blockchain consensus protocol and a system implementing such a protocol. The system includes a plurality of node computers (and a communications network connecting the plurality of node computers. The plurality of node computers includes a first node computer, a collecting node computer, a committee of node computers, and one or more node computers that operate based on proof of work algorithms. Each node computer in the plurality includes a blockchain consensus software application running on the processor of the node computer. The blockchain consensus software application is adapted to connect to the plurality of node computers that are connected to the communications network. The blockchain consensus software application implements the two-mode blockchain consensus protocol. Through the software application, the plurality of node computers operate to reach a consensus on adding data to a public ledger.

Abstract: The present invention is direct a two-mode blockchain consensus protocol and a system implementing such a protocol. The system includes a plurality of node computers (and a communications network connecting the plurality of node computers. The plurality of node computers includes a first node computer, a collecting node computer, a committee of node computers, and one or more node computers that operate based on proof of work algorithms. Each node computer in the plurality includes a blockchain consensus software application running on the processor of the node computer. The blockchain consensus software application is adapted to connect to the plurality of node computers that are connected to the communications network. The blockchain consensus software application implements the two-mode blockchain consensus protocol. Through the software application, the plurality of node computers operate to reach a consensus on adding data to a public ledger.

Abstract: The present invention is direct a two-mode blockchain consensus protocol and a system implementing such a protocol. The system includes a plurality of node computers (and a communications network connecting the plurality of node computers. The plurality of node computers includes a first node computer, a collecting node computer, a committee of node computers, and one or more node computers that operate based on proof of work algorithms. Each node computer in the plurality includes a blockchain consensus software application running on the processor of the node computer. The blockchain consensus software application is adapted to connect to the plurality of node computers that are connected to the communications network. The blockchain consensus software application implements the two-mode blockchain consensus protocol. Through the software application, the plurality of node computers operate to reach a consensus on adding data to a public ledger.

Abstract: A secure parallel processing technique for converting any parallel random access machine (PRAM) into an oblivious parallel random access machine (OPRAM), whose distribution of memory accesses is statistically independent of the data (with negligible error), while only inducing a polylogarithmic slowdown to both the total and parallel complexities of the program.

Abstract: A secure parallel processing technique for converting any parallel random access machine (PRAM) into an oblivious parallel random access machine (OPRAM), whose distribution of memory accesses is statistically independent of the data (with negligible error), while only inducing a polylogarithmic slowdown to both the total and parallel complexities of the program.