BTC bar

1.

In 2008, a pseudonym software developer proposed bitcoin as an electronic payment system based on mathematical proof. The idea is to create a means of exchange independent of any central authority that can be transferred electronically in a secure, verifiable and unchangeable manner

bitcoin is a kind of P2P virtual digital currency based on blockchain technology, which can be traded with the world

bitcoin can be used for many purposes, including providing funds for companies, investing in cash and transferring money free of charge. Bitcoin is usually associated with criminal activities such as drug trading, cyber crime and money laundering, because it is almost impossible to associate bitcoin wallet with anyone

2. Let's go. There are so many exchanges, and the users are so small. The operating cost of an exchange is 20-30 people, and the monthly expenditure is 1 million. Who has so much money to maintain it??? Exchange or choose big platform reliable

3. Cute sweetheart younger sister is new to the world, level 2 (195) | my knowledge | my news (0 / 3) | my space | network home page | exit
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network knowledge & gt; Art & gt; Magic acrobatics added to the collection to be solved
who can teach me some magic tricks
reward points: 0 - there are 14 days and 22 hours before the end of the problem
I want something simpler. It's better to use simple props such as rubber bands, coins and rings! Please recommend it to me first. ~ ~ ~
questioner: ZY Star Wing assistant Level 3

I'll answer:
the answer will get 2 points, if the answer is accepted, I'll get a reward and 20 points.
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5 answers in total
http://www.artvs.cn/?fromuid=29313

References: http://www.artvs.cn/?fromuid=29313
responder: Chuang Li people surf the Internet - rookie of the world level 4 5-7 19:34
Leather Magic

1. Pull a rubber band on your left thumb and index finger, The rubber band is parallel to the ground

2. Lift another rubber band from the right index finger (at a 90 degree angle with the ground) and put it into the circle of "pull a rubber band with the left thumb and index finger", and put the right thumb into the "another rubber band". In this way, the two rubber bands can pull each other, they can't get out. However, do not change the angle between the two rubber bands and the ground

3. This is the key step. The left hand doesn't move. Pull your right thumb and index finger toward the horizontal line on your right side (parallel to the ground) until your right thumb and index finger stick together. The right thumb does not move, the right index finger and the right middle finger should move naturally (the key point): the right index finger and the right middle finger are side by side, the right middle finger is holding a rubber band, the right index finger comes out, and the right index finger goes through the right thumb. Then quickly put the middle finger of the rubber band, the right index finger up a pick. In this way, the two rubber bands no longer intersect, that is to say, the original rubber band inside has come out

in this way, the mystery of Liu Qian's rubber band magic will be solved
there are three magic tricks performed by the actors in the program. The first magic trick is very simple. If you look at it carefully, you will see that there is one action that must be done in the two performances, that is, the first step is to put the two fingers together, namely, the middle finger and the instant finger, and then there is a circling action before the performance. That is to say, the rubber band has been separated. The thumb and index finger hook the rubber band. When closing, quickly hang the rubber band with the middle finger, loosen the index finger, and then hook the rubber band with the index finger, so it comes out. Then, when the rubber band is put back to its original position, it constantly shakes the rubber band, because it has come out, and it is a continuous shaking action, which is not easy to see through. And then... Needless to say
respondent: lixinshiw - probation level 1 5-7 19:39
mystical hypnosis

a deck of poker, a piece of paper and a pen. Take out two stacks of cards from the whole deck and put them on the table, one of which is 4 3 cards, the other is 3 cards at will; Turn around and let the other party choose one of them; Then you write down on the paper: you will choose the stack of "3"

[uncover secrets: if the opponent chooses the stack of 4 3 cards, it will match in number; If she chooses another random 3 cards, then the number of cards matches. Ha ha, it's all the "3" stack

Magic straw

a cigarette and a straw packed in a paper bag. Hold the paper bag with thumb and index finger to make the straw fully rub with the paper bag, and then pull the straw out of the paper bag. Stand the cigarette on the table, put the straw close to the cigarette and rotate around it. At this time, the cigarette will shake and finally fall on the table. You give the other person the straw and the cigarette and let her try it on her own, but it won't succeed

[secret: the paper bag rubs against the straw to generate static electricity, which generates suction on the cigarette and makes the cigarette fall down. After touching the straw with your hand, the static electricity will disappear, so the straw will have no suction when the other party performs<

magic to make gravity disappear:
use a box of matches (don't pack too many matches) to shorten one of them a little (equivalent to the width of the match box). Put this short match across the matchbox so that it won't block other matches from falling down
now, the preparatory work is finished. First, you show the matches inside to others, but don't show the horizontal match. Then you mark an area on the table and say I want to make the gravity of this place disappear. Then take out the box inside with the box facing down, so that the match won't fall down. But you slowly move the match to another area. At this time, you just need to gently pinch the width of the front and back of the match box, and the match will fall off naturally< There is a piece of paper and a pencil on the desk. The performer goes to the table, turns out the pockets of his clothes to show the audience, proves that there is nothing in the pockets, and then turns them back. The performer picked up a pencil and wrote a number on the paper (not to be seen by the audience). After that, he put the note into his pocket. The performer said to the audience, "now you can say a random number. I've already predicted the number you said. It's written on the note just now. Well, now just think of a number and say it. " After the audience reported a number, the performer took out the note from his pocket and let the audience see the number written on it. It was the number reported by the audience. What's going on? Can performers really predict

specific operation:

the performer puts a pencil lead about 1cm long on one corner of the table in advance (because it is small, the audience will not find it). Of course, you can also hide the pencil lead in other places according to your own preference. When the performer picks up a pencil and writes the number on the paper, he should pretend to be writing without writing anything“ Put the note in your pocket. When the audience finished reporting the numbers, the performer stole the pencil lead from the table. Then put it in your pocket and quickly write the number on the note with pencil lead (for convenience, when you want the audience to report the number, you can limit the number between 0 and 9). At this time, the performer takes out the note for the audience to see (when the audience looks at the note, the performer can throw away the pencil lead), the audience will feel very incredible. Well, it's a wonderful little magic trick

2. Banknotes become white paper
preparatory work: 10 banknotes and 10 pieces of white paper

performance method: the performer puts the white paper between the 9th and 10th banknotes in advance. At the beginning of the performance, the performer unfolded 10 banknotes into fans and held them in his hands. Then take out a few front and back notes from the fan bank, and take the opportunity to move the 10 notes to the bottom, which is a stack of white paper. Then, straighten up the stack of banknotes, hit the stack with your right fist, and unfold the fan. Strange! The original stack of banknotes turned into white paper. Take out a few pieces of paper to explain, so that you can use the paper to cover the banknotes, it seems that the banknotes have become white paper

precautions: the banknotes and white paper for the performance should be new and upright

3. The newspaper holds water
the performer pours water into a funnel made of newspaper, which is amazing enough. How can the newspaper hold water? But he still folded the funnel of the newspaper solemnly so as not to let the water flow out; But the audience are waiting to see if the water is flowing out from under the newspaper. Unexpectedly, the performer suddenly throws the newspaper into the air, presses it down and unfolds it. The dripping water disappears and the newspaper is completely dry. Then roll up the newspaper and pour water into the glass. As props, need two ordinary daily necessities: a large glass with handle and a newspaper. In addition, we need an auxiliary prop -- a transparent plastic container with a diameter of 3-4cm and a height of 15cm, and an ear on the container. During the performance, the glass is placed on the table, and a plastic container is hung behind the glass (from the audience's point of view). Now roll the newspaper into a funnel shape, pick up the cup with your right hand, lift the left hand with the funnel-shaped newspaper behind the glass from bottom to top, and then hang the plastic container behind the glass into the newspaper. The water in the cup can be poured into the plastic cover in the funnel-shaped newspaper (be careful not to let the water wet the newspaper). When the water is almost poured, the hand holding the newspaper is lifted from the bottom to the top again. Let the glass hang the transparent plastic container away, and then put down the glass. In order to enhance the performance effect, the performer deliberately pretends to be very careful with the newspaper, which means not to let the water shake out, but suddenly he throws the newspaper into the air, or even into the audience. Then, roll the newspaper into a funnel again, and pour the water back into the cup from the newspaper. First, put the plastic container hanging on the glass into the funnel-shaped newspaper, and then pour the water in the plastic container into the forest. Then, hang the empty plastic container in the same way, and put the cup away, Then open the newspaper to the audience.

mind magic
prepare two books of the same type (for example, business ecation) for two audiences to check the two books. Then let an audience turn to any page, and then you say to him which page on the left or the right, and then let another audience turn to the number of pages that the first audience said, let him remember the first word of that page, and then the magician wrote that word< As like as two peas, br / > declassified: in fact, the two books are exactly the same, but the magician changed the book cover. When the magician asked the first audience to the left page or the right side, this is the magician who can see the first word in a big way. You are doing some mysterious action when you guess the word OK. Note: the two books must be of the same type<

the coin goes through the throat:
the magician first prepares a coin for the audience to check, then asks the audience to make a mark, and then he says I want to eat it in my mouth and pass it out from the back of my neck. Then he put the coin in his mouth, and the audience saw that he had nothing in his hand, and then he took it out from the back of his neck< In fact, the magician is saying, "I'm going to put it in my mouth and take it out from the back of my neck. This is what he has put on the back of my neck. But there's also the act of holding a coin. The next step is to pretend to be a ghost, swallow, and show that you are very uncomfortable. The longer you do this, the better. That is to let the audience forget what you just did, and then take it out from the back of the neck.

poker flying in
performance phenomenon:
the magician holds two cards in his left hand, and the audience turns back and forth once, indicating that there are only two cards. Then he folded up the two cards, held them in front of his eyes, breathed on the cards and said, "Poker flies, poker flies.". And then spread the cards, at this time, the magician has seven cards in his hand
the magician will play poker again

4. The largest city in Slovenia, the largest city in Slovenia, seems to be the largest city in that city.

5.

Bitcoin has been a hot topic in the past two or three years. Although Greyhound sports team did not participate in bitcoin speculation, Jason's good friend Roy in Berkeley is a good one. At the end of the European Cup, Jason managed to persuade Roy to share his experience in bitcoin arbitrage in the past few years

Roy and greyhound sports guarantee the truth of the story, but we are not responsible for the loss of you who are interested in carrying out relevant investment speculation through the inspiration of this story

(the following is Roy's first person narration:)

focusing on bitcoin is around 2011. At that time, I met my classmate Michael who drank too much in the school bar. Michael told me that he had spent 10000 dollars to buy 1000 bitcoin before, and now he has made 10 times as much. And talk about the significance of bitcoin for deflation and inflation, as well as his bullish bitcoin investment opportunities

my interest comes from the statistics of bitcoin price changes, so I wrote some crawler data in my spare time. While I was crawling data in the room, my good friend Roman came to visit me. Roman likes to trade by himself, so I told him about bitcoin. As a result, Roman was more energetic than me. A few days later, he called me and said that the price difference between exchanges was too big. Why didn't anyone arbitrage? I said indifferently that it might be caused by some trading restrictions. As a result, we two began to study how to arbitrage and found the real reasons for such a large price difference:

1
2. The transfer chain of bitcoin (between two exchanges) takes 5 to 60 minutes (this time is related to the principle of bitcoin) - the price fluctuation ring this period is enough to kill most of the profits
3. At that time, the biggest price difference was between China and the United States. However, e to the control of RMB, the capital could not flow back and the liquidity between the markets was poor

in response to these three problems, we came up with countermeasures at that time:
1. We tried to find an exchange that could be registered. At that time, bitcoin exchange was full of money, and people would continue to register
2. If the price difference between exchanges is large enough, we are not afraid of the 5-60 Minute Fluctuation - there is a high probability that we will make a profit
3. There are many ways to find exchange channels, which should be hopefully solved

So we entered the practical stage

at that time, there was no website that could directly buy US dollars, but there were many exchanges for RMB, the biggest of which was btcchina. We searched for a long time and found a website called local BTC. The general idea is that you can reserve bitcoin and then form a potential transaction. The website will help you freeze some bitcoin of the seller. After you transfer money, this bitcoin will belong to you. The equivalent of Local BTC has assumed the function of a Alipay. p>

in the first deal, we bought 0.94 bitcoin, which is unforgettable. This single transaction earned 30%, so happy that I don't want it. To solve the practical problem, we need to find a place where we can buy a lot of bitcoin in the United States. Local BTC is full of retailers, the number is too small, and the largest exchanges in the United States, such as Mt. GOx, have closed their registration. At this time, we found that it is possible for the Canadian exchange virt ex to register, but it is necessary to register a company. Just when we were going to register a company in Canada, we found that the domestic bitcoin players were frantically squeezing the existing profit margin. At that time, the bitcoin price difference between the two places was maintained at 30% - 50% for a long time, so many domestic bitcoin players with U.S. exchange accounts bought a lot of bitcoin and sold it in China. After selling it in China, they exchanged 8:1 exchange rate for us dollars in Taobao (at that time, the exchange rate between China and the United States was already 6.2x), and continued to arbitrage, which made the price difference between the two sides shrink rapidly. We feel that the profit margin will not exist until we have a good Canadian account

when there is no way out, our data tell us a turning point. After careful analysis, it is found that there is often a big price difference among several RMB exchanges: BTC China, huoyuan.com and okcoin, and it is very convenient to open three accounts. At the same time, domestic exchanges are the first to provide the function of borrowing bitcoin, which makes us begin to imagine whether we can arbitrage between RMB exchanges

is it to buy directly in the low price exchange, then transfer directly to the high price exchange, and then sell? It seems very simple, but you also need to bear the 5-60 Minute Fluctuation of transfer price, because you have no hedging

At this time, Roman came up with a new arbitrage method. It is to buy and sell the same amount of bitcoin in two different markets. Once the price gap widens, it will sell and buy the same amount of bitcoin at the same time to complete arbitrage. Then wait for the price difference between the two exchanges to narrow. But the core problem is that sometimes the prices of the two exchanges will not really reverse. For example, the price of BTC China is higher than that of huocoin.com for a long time. What should we do at this time? At this time, you need to calculate the average level of the price difference between the two sides, and buy and sell back and forth when the price difference fluctuates. This process of buying and selling may be a loss, but it is generally profitable

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