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BitTorrent tracker

A BitTorrent tracker is a server which assists in the communication between peers using the BitTorrent protocol. It is also, without any extension to the original protocol, the only major single point of failure, as clients are required to communicate with the tracker to initiate downloads. (Clients that have already begun downloading also communicate with the tracker periodically to negotiate with newer peers and provide statistics, however, after the initial reception of peer data, peer communication can continue without a tracker.)

Trackers and indexes

A tracker should be differentiated from a BitTorrent index by the fact that it does not necessarily list files that are being tracked. A BitTorrent index is a list of .torrent files (usually including descriptions and other information). Trackers merely coordinate communication between peers attempting to download the payload of the torrents.

Many BitTorrent websites act as both tracker and index, for example The Pirate Bay. Sites such as these publicize the tracker's URL and allow users to upload torrents to the index with the tracker's URL embedded in them, providing all the features necessary to initiate a download.

Legal issues

Trackers illegally tracking copyrighted content are often the targets of cease and desist lawsuits from copyright bodies such as the MPAA and RIAA, despite the fact that they do not actually supply any copyrighted data themselves. Usually these websites are located in countries that have little or no copyright laws so they can get away with it. The Pirate Bay (located in Sweden) is famous for publishing and making fun of legal threats.

Improving tracker reliability

Trackers are the primary reason for a damaged BitTorrent 'swarm'. (Other reasons are mostly related to damaged or hacked clients uploading corrupt data.) The reliability of trackers has been improved through two main innovations in the BitTorrent protocol:

Multi-tracker torrents

Multi-tracker torrents feature multiple trackers in the one torrent. This way, should one tracker fail, the others can continue supporting file transfer.

'Trackerless' torrents

There are two incompatable 'trackerless' BitTorrent transfer (aka. decentralized tracking) methods: DHT-based implementations, and Azureus's 'Distributed Database'.

The term 'trackerless' is something of a misnomer, as decentralized tracking essentially treats every peer in the swarm as a tracker. BitComet was the first client to offer decentralized tracking through its DHT method. Later, Azureus and Bram Cohen's original BitTorrent client adopted this feature, although Azureus's method of implementation is incompatible with the DHT offered by all other supporting clients.

Prominent sites running trackers

  • The Pirate Bay

BitTorrent Tracking Software

  • BNBT - C++ port of the original BitTorrent tracker written in Python by Bram Cohen
    • CBTT, XBNBT and EasyTracker - popular modifications of BNBT
  • TBDev.net Updated and modification supported fork of the older TorrentBits code.
  • TorrentTrader - Free PHP and MySQL tracker
  • OpenTracker - PHP and MySQL tracker

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Later, Azureus and Bram Cohen's original BitTorrent client adopted this feature, although Azureus's method of implementation is incompatible with the DHT offered by all other supporting clients. This condition has not been found in many other animals, and is not known to occur in humans. BitComet was the first client to offer decentralized tracking through its DHT method. This is probably because rats are extremely sensitive to dietary protease inhibitors like those found in soybeans, which can disrupt the action of digestive enzymes needed to break down protein. The term 'trackerless' is something of a misnomer, as decentralized tracking essentially treats every peer in the swarm as a tracker. A 1985 animal study showed that young rats fed large amounts of soy products as their primary food source showed an increased risk of pancreatic cancer. decentralized tracking) methods: DHT-based implementations, and Azureus's 'Distributed Database'. The original paper in the journal Circulation: January 17,2006[4].

There are two incompatable 'trackerless' BitTorrent transfer (aka. [3]. This way, should one tracker fail, the others can continue supporting file transfer. The panel also found that soy isoflavones do not reduce post menopause "hot flashes" in women nor do isoflavones help prevent cancers of the breast, uterus or prostate. Multi-tracker torrents feature multiple trackers in the one torrent. In January , 2006 an American Heart Association review (in the journal Circulation) of a decade long study of soy protein benefits casts doubt on the FDA allowed "Heart Healthy" claim for soy protein. (Other reasons are mostly related to damaged or hacked clients uploading corrupt data.) The reliability of trackers has been improved through two main innovations in the BitTorrent protocol:. The FDA granted this health claim for soy: "25 grams of soy protein a day, as part of a diet low in saturated fat and cholesterol, may reduce the risk of heart disease." One serving, (1 cup or 240 mL) of soy milk, for instance, contains 6 or 7 grams of soy protein.

Trackers are the primary reason for a damaged BitTorrent 'swarm'. On the basis of this research PTI, in 1998, filed a petition with FDA for a health claim that soy protein may reduce cholesterol and the risk of heart disease. The Pirate Bay (located in Sweden) is famous for publishing and making fun of legal threats. Soy phytoestrogens (isoflavones: genistein and daidzein) adsorbed onto the soy protein were suggested as the agent reducing serum cholesterol levels. Usually these websites are located in countries that have little or no copyright laws so they can get away with it. However, High Density Lipoprotein HDL(good cholesterol) did not increase. Trackers illegally tracking copyrighted content are often the targets of cease and desist lawsuits from copyright bodies such as the MPAA and RIAA, despite the fact that they do not actually supply any copyrighted data themselves. This meta-analysis concluded that soy protein is correlated with significant decreases in serum cholesterol, Low Density Lipoprotein LDL (bad cholesterol) and triglyceride concentrations.

Sites such as these publicize the tracker's URL and allow users to upload torrents to the index with the tracker's URL embedded in them, providing all the features necessary to initiate a download. Louis. Many BitTorrent websites act as both tracker and index, for example The Pirate Bay. 5) published a report from the University of Kentucky entitled, "Meta-Analysis of the Effects of Soy Protein Intake on Serum Lipids." It was financed by the PTI division of DuPont,"The Solae Co."[2] St. Trackers merely coordinate communication between peers attempting to download the payload of the torrents. 333, No. A BitTorrent index is a list of .torrent files (usually including descriptions and other information). In 1995, the New England Journal of Medicine (Vol.

A tracker should be differentiated from a BitTorrent index by the fact that it does not necessarily list files that are being tracked. Isoflavones are polyphenol compounds, produced primarily by beans and other legumes, including peanuts and chickpeas. . Soybeans also contain isoflavones, forms of phytoestrogen that are considered by some nutritionists and physicians to be useful in the prevention of cancer, though very controversial and also blamed for some thyroid and reproductive health problems. (Clients that have already begun downloading also communicate with the tracker periodically to negotiate with newer peers and provide statistics, however, after the initial reception of peer data, peer communication can continue without a tracker.). They are also high in fiber and vitamin C. It is also, without any extension to the original protocol, the only major single point of failure, as clients are required to communicate with the tracker to initiate downloads. In spite of the chelating effects of phytic acid, soybeans remain a good source of magnesium, potassium, phosphorus, calcium, and manganese.

A BitTorrent tracker is a server which assists in the communication between peers using the BitTorrent protocol. Scientific research [1] also indicates that it may reduce the risk of colon cancer. OpenTracker - PHP and MySQL tracker. The Journal of Environmental Nutrition (April 2004 volume 27 issue 4) has also stated phytic acid may be considered a phytonutrient, providing an antioxidant effect. TorrentTrader - Free PHP and MySQL tracker. However, dietary mineral chelators help prevent over-mineralization of joints, blood vessels, and other parts of the body, which is most common in older persons. TBDev.net Updated and modification supported fork of the older TorrentBits code. For people with a particularly low intake of essential minerals, especially young children and those in developing countries, this effect can be undesirable.

CBTT, XBNBT and EasyTracker - popular modifications of BNBT. Of any studied legume, whole soybeans have the highest levels of phytic acid, an organic acid and mineral chelator present in many plant tissues, especially bran and seeds, which binds to certain ingested minerals: calcium, magnesium, iron, and especially zinc—in the intestinal tract, and reduces the amount the body assimilates. BNBT - C++ port of the original BitTorrent tracker written in Python by Bram Cohen

    . The only non-legume to have an almost identical protein profile to soy is the cereal oat (Avena sativa), and perhaps quinoa. The Pirate Bay. Soy protein is similar to that of other legume seeds, but has the highest yield per square meter of growing area, and is the least expensive source of dietary protein. For this reason, soy is important to many vegetarians and vegans.

    A complete protein is one that contains significant amounts of all the essential amino acids that must be provided to the human body because of the body's inability to synthesize them. Soybeans are a source of complete protein. Concern is also for the high amounts of residual toxin since the herbicide is sprayed on the soya crop repeatedly during growth. As with other "Roundup Ready" crops, concern is expressed over damage to biodiversity through the loss of wildflowers removed by the roundup treatment, and consequent loss of insects and birds that depend on them.

    Currently, 80% of all soybeans cultivated for the commercial market are genetically modified. RR soybeans allow a farmer to reduce tillage or even to sow the seed directly into an unplowed field, known as 'No Plow' tillage. Roundup kills conventional soybeans. strain CP4, inserted, by means of a gene gun, into its genome that allows the transgenic plant to survive being sprayed by this non-selective, glyphosate-based herbicide.

    In 1995, Monsanto introduced "Roundup Ready" (RR) soybeans that have had a complete copy of a gene (plasmid) from the bacteria, Agrobacterium sp. Monsanto is the world's leader in genetically modified soy for the commercial market. Soybeans are one of the "Biotech Food" crops that are being genetically modified, and GMO soybeans are being used in an increasing number of products. Soybeans are also used as fermenting stock to make a brand of vodka.

    Soybeans are also used in industrial products including oils, soap, cosmetics, resins, plastics, inks, crayons, solvents, and biodiesel. Additionally, soy protein has been found to reduce renal excretion of calcium, an effect that is reinforced by the high potassium content of soy products. Tofu often contains high amounts of this important mineral since calcium salts are used to coagulate the protein in soy milk when creating tofu. Many manufacturers of soy milk now sell calcium-enriched products as well.

    Soy milk does not contain significant amounts of calcium, since the high calcium content of soybeans is bound to the insoluble constituents and remains in the pulp. These imitation products are derived from extensive processing to produce a texture and appearance similar to the real dairy-based ones. Many traditional dairy products have been imitated using processed soybeans, and imitation products such as soy milk, "soy yogurt" and "soy cream cheese" are readily available in most supermarkets. The formulas are sold in powdered, ready to feed, or concentrated liquid forms.

    Infant formulas based on soy are used by lactose-intolerant babies; and for babies that are allergic to human milk proteins and cow milk proteins. It is the starting material for production of soy concentrate and soy protein isolate. Soy flour refers to defatted soybeans where special care was taken during desolventizing (not toasted) in order to minimize denaturation of the protein to retain a high Nitrogen Solubility Index (NSI), for uses such as extruder texturizing (TVP). Soybean meal, the material remaining after solvent extraction of soybean flakes, with a 50% soy protein content, toasted (a misnomer because the heat treatment is with moist steam), and ground, in a hammer mill, provided the energy for the American revolution, beginning in the 1930s, of growing farm animals such as poultry and swine on an industrial scale; and more recently the aquaculture of catfish.

    The remaining soybean husks are used mainly as animal feed. New processes increasingly prepare protein isolates for use as food additives or health supplements. The oils are exported abroad, sold as vegetable oil, or end up in a wide variety of processed foods. The oils are blended for their applications, and sometimes hydrogenated.

    The soybeans are cracked, adjusted for moisture content, rolled into flakes and solvent extracted with commercial hexane. Soybean oil extraction is performed on a large scale in the U.S. Soybean oil makes up 80% of the edible oil consumption in the United States. All commercial soybeans in the United States are yellow or yellow brown.

    Soybeans having a dark colored seed coat, or even beans with a dark hilum will inadvertently leave dark specks in the flour, an undesirable factor when used in food products. In processing soybeans for oil extraction and subsequent soy flour production, selection of high quality, sound, clean, dehulled yellow soybeans is very important. Soybeans are also the primary ingredient involved in the production of soy sauce (or shoyu). Common forms of soy (or soya) include soy meal ( used as animal feed), soy flour, "soy milk", tofu, textured vegetable protein (TVP, which is made into a wide variety of vegetarian foods, some of them intended to imitate meat), tempeh, soy lecithin and soybean oil (aka "vegetable oil" in the USA).

    The beans can be processed in a variety of ways. Soybeans prepared this way are a popular local snack in Hawai'i, where, as in Japan, China, and Korea, the bean and products made from the bean (miso, natto, tofu, douchi, doenjang, ganjang and others) are a significant part of the diet. Soybeans may be boiled whole in their green pod and served with salt, under the Japanese name edamame. A smaller percentage of soybeans are used directly for human consumption, particularly in Asia.

    The bulk of the soybean crop is grown for oil production, with the high-protein defatted and "toasted" soy meal used as livestock feed. Soybeans are the most important cash crop in the United States and the leading agricultural export. Among the legumes, the soybean, also classed as an oilseed, is pre-eminent for its high (38-45%) protein content as well as its high (20%) oil content. The "garden" cultivars are generally not suitable for mechanical combine harvesting because they have a tendency for the pods to shatter on reaching maturity.

    Tofu and soymilk producers prefer the higher protein cultivars bred from vegetable soybeans originally brought to the United States in the late 1930s. Vegetable types cook more easily, have a mild nutty flavor, better texture, are larger in size, higher in protein, and lower in oil than field types. Soybeans can be broadly classified as "vegetable" (garden) or field (oil) types. Peanuts, soybeans, sweet potatoes or other plants that would replenish the soil with nitrogen and minerals were planted for two years and then cotton on the third year.

    He also encouraged farmers to use crop rotation. The first research on soybeans in the United States was conducted by George Washington Carver at Tuskeegee, Alabama, but he decided it was too exotic a crop for the poor black farmers of the South so he turned his attention to peanuts. Environmental groups, such as Greenpeace and the WWF, have reported that soybean cultivation and the threat to increase soybean cultivation in Brazil is destroying huge areas of Amazon rainforest and encouraging deforestation. Other leading producers are Brazil, Argentina, China, Japan, and India.

    produced 75 million metric tons of soybeans in 2000, of which more than one-third was exported. The U.S. Soybeans are native to southeast Asia, but 45 percent of the world's soybean area, and 55 percent of production, is in the United States. Modern crop cultivars generally reach a height of 1 m or more, and take between 80-120 days from sowing to harvesting.

    However, for best results an inoculum of the correct strain of bacteria should be mixed with the soybean(or any legume) seed before planting. Rhizobium japonicum; Jordan 1982). Soybeans, like most legumes perform nitrogen fixation by establishing a symbiotic relationship with the bacterium Bradyrhizobium japonicum (syn. They can grow in a wide range of soils, with optimum growth in moist alluvial soils with a good organic content.

    Cultivation is successful in climates with hot summers, with optimum growing conditions in mean temperatures of 20 °C to 30 °C; temperatures of below 20 °C and over 40 °C retard growth significantly. Soybeans did not become an important crop outside of Asia until about 1910. Benjamin Franklin wrote a letter in 1770 mentioning sending soybeans home from England. They were first introduced to Europe in the early 1700s and the United States in 1765, where it was first grown for hay.

    Soybeans were used as food in eastern Asia long before written records, and it is still a major crop in China, Japan and Korea. A very small proportion of the crop is consumed directly for food by humans. The bulk of the crop is solvent extracted for vegetable oil and the defatted soy meal is used for animal feed. It is grown for its oil and protein.

    Soybeans are an important global crop, with political ramifications. The scar, visible on the seed coat, is called the hilum (colors include black, brown, buff, gray and yellow) and at one end of the hilum is the micropyle, or small opening in the seed coat which can allow the absorption of water. The hull of the mature bean is hard, water resistant, and protects the cotyledon and hypocotyl (or "germ") from damage. Soybeans occur in various sizes, and in several hull or seed coat colors, including black, brown, blue, yellow, and mottled.

    . The word soy is derived from the Japanese word shoyu (soy sauce/soya sauce). Beans are classed as pulses whereas soybeans are classed as oilseeds. However, it is known that the progenitor of the modern soybean was a vine-like plant, that grew prone on the ground.

    It is a cultural variety (a cultigen) with a very large number of cultivars. Like corn and some other crops of long domestication, the relationship of the modern soybean to wild-growing species can no longer be traced with any degree of certainty. The small, inconspicuous, self-fertile flowers are borne in the axil of the leaf and are either white or purple; The fruit is a hairy pod that grow in clusters of 3-5, with each pod 3-8 cm (1-3 inches) long and usually containing 2-4 (rarely more) seeds 5-11 mm in diameter. The leaves are trifoliate (sometimes with 5 leaflets), the leaflets 6-15 cm (2-6 inches) long and 2-7 cm (1-3 inches) broad; they fall before the seeds are mature.

    The pods, stems, and leaves are covered with fine brown or gray pubescence. It may grow prostrate, not growing above 20 cm (7.8 inches); up to stiffly erect plants growing to 2 meters (6.5 feet). It is an annual plant, which may vary in growth habit and height. Soybean(s) (U.S.) or Soya bean (UK) Glycine max is a species of legume, native to eastern Asia.

    The lecithin content varies up to 15%. Lecithinated soy flour, is made by adding soybean lecithin to defatted, low fat or high fat soy flours to increase their dispersibility and impart emulsifying properties. High fat soy flour, is produced by adding back soybean oil to defatted flour, at the level of 15%. The lipid content varies according to specifications, usually between 4.5% and 9%.

    Low fat soy flour, is made by adding back some oil to defatted soy flour. Due to its high oil content a specialized Alpine Fine Impact Mill must be used for grinding rather than the more common hammermill. Full-fat soy flour, is made from unextracted, dehulled beans, and contains about 18% to 20% oil. Defatted soy flour, is obtained from solvent extracted flakes, and contains less than 1% oil.