Published on July 21st, 2015 | by bitcoin0
blockchain white paper
Information about blockchain white paper
Block chain (database)
A block chain is a distributed data store that maintains a continuously growing list of data records that are hardened against tampering and revision, even by operators of the data store’s nodes. The most widely known application of a block chain is the public ledger of transactions for cryptocurrencies, such as bitcoin. This record is enforced cryptographically and hosted on machines running the software.
The technology forms the basis of all cryptocurrencies.
White is an achromatic color, literally a “color without color”, composed of a mixture of all frequencies of the light of the visible spectrum. It is one of the most common colors in nature, the color of sunlight, snow, milk, chalk, limestone and other common minerals. In many cultures white represents or signifies purity, innocence, and light, and is the symbolic opposite of black, or darkness. According to surveys in Europe and the United States, white is the color most often associated with perfection, the good, honesty, cleanliness, the beginning, the new, neutrality, and exactitude.
In ancient Egypt and ancient Rome, priestesses wore white as a symbol of purity, and Romans wore a white toga as a symbol of citizenship. In the Middle Ages and Renaissance a white unicorn symbolized chastity, and a white lamb sacrifice and purity; the widows of kings dressed in white rather than black as the color of mourning. It sometimes symbolizes royalty; it was the color of monarchism after the French Revolution and of the White Russians who fought the Bolsheviks during the Russian Civil War. Greek and Roman temples were faced with white marble, and beginning in the 18th century, with the advent of neoclassical architecture, white became the most common color of new churches, capitols and other government buildings. It was also widely used in 20th century modern architecture as a symbol of modernity, simplicity and strength.
White is an important color for almost all world religions. The Pope, the head of the Roman Catholic Church, has worn white since 1566, as a symbol of purity and sacrifice. In Islam, and in the Shinto religion of Japan, it is worn by pilgrims; and by the Brahmins in India, In Western cultures and in Japan, white is the most common color for wedding dresses, symbolizing purity and virginity.
The white color on television screens and computer monitors is created with the RGB color model by mixing red, green and blue light at equal intensities.
In nature, snow and clouds appear white because they are composed of water droplets or ice crystals mixed with air; when white sunlight enters snow, very little of the spectrum is absorbed; almost all of the light is reflected or scattered by the air and water molecules, so the snow appears to be the color of sunlight, white. Beaches with sand containing high amounts of quartz or eroded limestone also appear white, since quartz and limestone reflect or scatter sunlight, rather than absorbing it. Tropical white sand beaches may also have a high quantity of white calcium carbonate from tiny bits of seashells ground to fine sand by the action of the waves.
Paper is a thin material produced by pressing together moist fibers, typically cellulose pulp derived from wood, rags or grasses, and drying them into flexible sheets. It is a very versatile material with many uses; whilst the most common one is for writing and printing upon, it is also widely used as a packaging material; in many cleaning products; in a number of industrial and construction processes, and even as a food ingredient – particularly in Asian cultures.
It and the pulp papermaking process is said to have been developed in China during the early 2nd century AD, possibly as early as the year 105 A.D., by the Han court eunuch Cai Lun, although the earliest archaeological fragments of paper derive from the 2nd century BC in China.
The modern pulp and paper industry is global, with China leading its production and the United States right behind it.
^ Hogben, Lancelot. “Printing, Paper and Playing Cards”. Bennett, Paul A. (ed.) Books and Printing: A Treasury for Typophiles. New York: The World Publishing Company, 1951. pp 15-31. p. 17. & Mann, George. Print: A Manual for Librarians and Students Describing in Detail the History, Methods, and Applications of Printing and Paper Making. London: Grafton & Co., 1952. p. 77
^ Tsien 1985, p. 38