Wednesday, 19 December, 2018

Blockchain Explained

Blockchain Explained

Posted on Friday, 16 February, 2018 by Zheluo Cai

Blockchain Explained.

Blockchain is an algorithm and distributed data structure for managing electronic cash without a central administrator among people who know nothing about one another. Originally designed for the crypto-currency Bitcoin, the blockchain architecture was driven by a radical rejection of (government-guaranteed) money and bank-controlled payments. Blockchain is a Distributed Ledger Technology (DLT) that was invented to support the Bitcoin cryptocurrency. The developer of Bitcoin, Satoshi Nakamoto envisioned people spending money without friction, intermediaries, regulation or the need to know or trust other parties. Technically, the original blockchain is separable from Bitcoin, but this report will show that the blockchain design is so specific to Bitcoin that it’s not a good fit for much else. The central problem in electronic cash is Double Spend. Because pure electronic money is just data, nothing stops a currency holder from trying to spend it twice. Blockchain solves the Double Spend problem without a digital reserve fund or similar form of an umpire. Blockchain monitors and verifies Bitcoin transactions by calling upon a decentralised network of volunteer-run nodes to, in effect, vote on the order in which transactions occur. The network’s algorithm ensures that each transaction is unique. Credit: Steve Wilson for ZDNet.

Read Article Here:

https://www.cnet.com/news/blockchain-explained-builds-trust-when-you-need-it-most/

Cepheus: Trunk to Bubble.
Credit & Copyright: Rogelio Bernal Andreo. Star clusters, glowing nebulae and dark dust clouds abound in Cepheus, the royal constellation of the northern hemisphere spanning about 17 degrees. At the lower left, the large emission nebula catalogued as IC 1396, is hundreds of light-years across and about 3,000 light-years distant, containing a dark, winding, tendril-shaped feature known as the Elephant's Trunk. Near the top middle, the bright nebula is NGC 7380. At the upper right lies NGC 7635 (the Bubble Nebula) and star cluster M52. Associated with star formation, the sites are telltale markers along the region's complex of giant molecular clouds.

December 18: The Moon passes 5° south of Uranus (image above), 4h UT (11 PM EST).

December 20: Jupiter passes 5° north of Antares, 2h UT (9 PM EST).

December 21: Mercury passes 6° north of Antares, 8h UT (3 AM EST).

December 21: Mercury passes 0.9° north of Jupiter, 15h UT (10 AM EST).

December 21: Summer Solstice occurs at 22h23m UT (5:23 PM EST).

December 22: Full Moon occurs at 17h49m UT (12:49 AM EST).

December 24: The Moon is at perigee (361,061 km from Earth), 9h49m UT (4:49 AM EST).

Credit: Astronomy.

Sunflowers (Tournesols) is the name of two series of still life paintings by the Dutch painter Vincent van Gogh. The first series, executed in Paris in 1887, depicts the flowers lying on the ground, while the second set, executed a year later in Arles, shows a bouquet of sunflowers in a vase. In the artist's mind, both sets were linked by the name of his friend Paul Gauguin, who acquired two of the Paris versions. On March 30, 1987, Japanese insurance magnate, Yasuo Goto, paid the equivalent of US $39,921,750 for van Gogh's Still Life: Vase with Fifteen Sunflowers at auction at Christie's London. The painting currently resides at Seiji Togo Yasuda Memorial Museum of Modern Art in Tokyo.

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