Special relativity teaches us that there is no invariant total ordering of events in space-time; different observers can disagree about which of two events happened first. There is only a partial order in which an event e1 precedes an event e2 iff e1 can causally affect e2. I realized that the essence of Johnson and Thomas’s algorithm was the use of timestamps to provide a total ordering of events that was consistent with the causal order.
“In computer science there are fundamental trade-offs between security and performance. Bitcoin’s automated integrity necessarily comes at high costs in its performance and resource usage. Compared to existing financial IT, Satoshi made radical trade-offs in favor of security and against performance. The seemingly wasteful process of mining is the most obvious of these trade-offs, but it also makes others.
Silicon Valley is a nickname for the southern portion of the San Francisco Bay Area, in the northern part of the U.S. state of California. The "valley" in its name refers to the Santa Clara Valley in Santa Clara County, which includes the city of San Jose and surrounding cities and towns, where the region has been traditionally centered. The region has expanded to include the southern half of the San Francisco Peninsula in San Mateo County, and southern portions of the East Bay in Alameda County.
Deep Blue was a chess-playing computer developed by IBM. It is known for being the first computer chess-playing system to win both a chess game and a chess match against a reigning world champion under regular time controls.
Deep Blue won its first game against a world champion on 10 February 1996, when it defeated Garry Kasparov in game one of a six-game match.
Bitcoin is deflationary digital money cryptographically secured by a peer to peer network of computers. Bitcoin makes possible borderless digital commerce with little risk of censorship or currency devaluation by a central authority.
In European folklore and folk-belief of the Medieval and Early Modern periods, familiar spirits (sometimes referred to simply as "familiars" or "animal guides") were believed to be supernatural entities that would assist witches and cunning folk in their practice of magic. According to the records of the time, they would appear in numerous guises, often as an animal, but also at times as a human or humanoid figure, and were described as "clearly defined, three-dimensional… forms, vivid with colour and animated with movement and sound" by those alleging to have come into contact with them, unlike later descriptions of ghosts with their "smoky, undefined form[s]".