Block chain

Block chain may refer to:

Bitcoin

Bitcoin is a digital asset and a payment system invented by Satoshi Nakamoto, who published the invention in 2008 and released it as open-source software in 2009. The system is peer-to-peer; users can transact directly without an intermediary. Transactions are verified by network nodes and recorded in a public distributed ledger called the block chain. The ledger uses bitcoin as its unit of account. The system works without a central repository or single administrator, which has led the U.S. Treasury to categorize bitcoin as a decentralized virtual currency. Bitcoin is often called the first cryptocurrency, although prior systems existed. Bitcoin is more correctly described as the first decentralized digital currency. It is the largest of its kind in terms of total market value.

Bitcoins are created as a reward for payment processing work in which users offer their computing power to verify and record payments into a public ledger. This activity is called mining and miners are rewarded with transaction fees and newly created bitcoins. Besides being obtained by mining, bitcoins can be exchanged for other currencies, products, and services. Users can send and receive bitcoins for an optional transaction fee.

World

World is a common name for the whole of human civilization, specifically human experience, history, or the human condition in general, worldwide, i.e. anywhere on Earth or pertaining to anywhere on Earth.

In a philosophical context it may refer to:

In a theological context, world usually refers to the material or the profane sphere, as opposed to the celestial, spiritual, transcendent or sacred. The "end of the world" refers to scenarios of the final end of human history, often in religious contexts.

World history is commonly understood as spanning the major geopolitical developments of about five millennia, from the first civilizations to the present.

World population is the sum of all human populations at any time; similarly, world economy is the sum of the economies of all societies (all countries), especially in the context of globalization. Terms like world championship, gross world product, world flags etc. also imply the sum or combination of all current-day sovereign states.

Zürich

Zürich or Zurich (/ˈzjʊərɪk/, Swiss Standard German Zürich [ˈtsʏrɪç], German Standard German Zürich [ˈtsyːʁɪç], Swiss German: Züri [ˈtsyɾi], French: Zurich [zyʁik], Italian: Zurigo [dzuˈriːɡo], Romansh: Turitg [tuˈritɕ]) is the largest city in Switzerland and the capital of the canton of Zürich. It is located in north-central Switzerland at the northwestern tip of Lake Zürich. The municipality has approximately 400,028 inhabitants, the urban agglomeration 1.315 million, and the Zurich metropolitan area 1.83 million. Zürich is a hub for railways, roads, and air traffic. Both Zürich Airport and railway station are the largest and busiest in the country.

Permanently settled for around 2000 years, Zürich has a history that goes back to its founding by the Romans, who, in 15 BC, called it Turicum. However, early settlements have been found dating back more than 6400 years ago. During the Middle Ages Zürich gained the independent and privileged status of imperial immediacy and, in 1519, became a primary centre of the Protestant Reformation in Europe under the leadership of Ulrich Zwingli.

Don Tapscott

Don Tapscott (born June 1, 1947) is a Canadian business executive, author, consultant and speaker, specializing in business strategy, organizational transformation and the role of technology in business and society. He is CEO of The Tapscott Group, and was founder and chairman of the international think tank New Paradigm before its acquisition. He is Vice Chair of Spencer Trask Collaborative Innovations, a new company building a portfolio of companies in the collaboration and social media space. In World Business Forum 2013, Tapscott stated that today the Internet provides access to real-time global intelligence and described the four strategies that rules today's leadership: the technological revolution, the Net Generation, and the economic and social revolution.

In 2012, Tapscott opened TEDGlobal in Edinburgh, where his talk, 4 Principles for the Open World, was viewed by more than 500,000 people online. Tapscott has authored or co-authored fifteen books on the application of technology in business and society. His most recent, Macrowikinomic: New Solutions for a Connected Planet (revised paperback, 2012), co-authored by Anthony D. Williams, was originally released in September 2010.Macrowikinomics has been recognized by the 2012 Tribeca Disruptive Innovation Awards, and 2010 Financial Times Best Book nominations. His 2006 book, Wikinomics: How Mass Collaboration Changes Everything (2006), co-authored by Anthony D. Williams, was an international bestseller, was number 1 on the 2007 management book charts, and was translated into 20 languages.