The block chain that the pupils know -- the origin of the bitcoin
Let's first assume that a school called "Earth" is on a closed small island.
我们假设有一所名叫“地球”的学校位于一座封闭的小岛上
Object change
1 grade when, between classmates love excess items such as direct exchange, Xiaoming has 2 pens, but no eraser, 2 red rubber, no pen, then he went with a red pen and a rubber for the exchange, each gets what he needs.
以物换物
1年级的时候，班里的同学之间喜欢将多余的物品进行直接交换，例如小明有2支笔，没有橡皮，而小红有2个橡皮，没有笔，于是小明就用一支笔和小红一个橡皮进行了交换，各自得到了自己需要的东西。
(historically human transactions are cattle, sheep, food, and so on.)
（历史上人类进行的物物交易是牛羊，食物之类的）
Physical money
2 grade, because the parents distressed children gave more supplies and goods trade expands to the class, barter way more convenient, Xiaoming has 2 pen bag, and 2 bags of red rubber, even everyone began to exchange desk, bench, and so we started to use a general physical currency to exchange, such as hot strip, we agreed a package of hot strip can be a pen, you can change a piece of rubber, 10 packs of hot strip can change a desk. So Xiao Hong can use a bag of spicy strips to change the pen with Xiao Ming, and other children can also use a bag of spicy strips to change the rubber with the little red.
实物货币
2年级的时候，由于父母心疼孩子给了更多的学习用品，以及物品的交易扩大到了班级之间，以物换物的方式越来越不方便了，小明已经有2书包笔了，而小红有2书包的橡皮，甚至大家都开始交换书桌，板凳，于是大家开始使用一种通用的实物货币来进行交换，例如：辣条，大家约定一包辣条可以换一支笔，也可以换一块橡皮，10包辣条就可以换个书桌。于是小红就可以用一包辣条来和小明换笔，而其他小朋友也可以用一包辣条来和小红换橡皮。
(the history of human use of a lot of real money, from the shell, stone, gold, silver, copper has)
（历史上人类使用了很多实物货币，从贝壳，石头，到金，银，铜都有）
Symbolic currency
3 grade, my parents and more and more things, pen and rubber are on the box calculation, the problem, hot strip is not enough to use! Some people even hoarding a large spicy, spicy school because of not enough, have economic circulation phenomenon, a large number of stranded cargo, this time the teacher stood up and said: "we have a hot hand, I'll give you a receipt issued by the paper, the number of paper receipts later, I can go to the exchange amount of hot strip," paper receipts and destroy exchange, because the authority and credibility of the teacher, everyone put hot strip to the teacher, the teacher began to use the issue of hot strip bonds trading, economic circulation more smoothly, we are no longer in the desk and bedroom the stack in the hot strip.
符号货币
3年级了，爸妈给的物品越来越多了，笔和橡皮都是论箱子计算，问题来了，辣条不够用了！甚至有的人囤积了大量的辣条，学校由于辣条不够用的情况，已经产生了经济流通不畅的现象，货物大量滞留，这个时候老师站出来说：“大家都把辣条交上来，我给大家发放一种纸质收据，凭纸质收据上的数量，以后可以到我这里兑换等量的辣条，并且销毁兑换的纸质收据”，由于老师的权威性和可信性，大家都把辣条交给了老师，开始使用老师发放的辣条券进行交易，经济流通更加顺畅了，大家再也不用在课桌和寝室里堆满辣条了。
Central virtual currency
In grade 4, the teacher collected spicy strips and banknotes every day, so he didn't have time to prepare lessons, so he handed the work to the student chairman, two dog son, to take the responsibility of issuing currency. The two dog was very clever. He did it for a few days and found it seemed to have not really written so much paper. It's all right: the students make all the notes and destroy them, but the two dogs will record the amount of money each person has to pay. If you want to pay later, such as Xiao Ming to take 1 hot strip for eraser to red, went to two dogs son call to the name of the 1 hot strip under the small red name, two dog took out books, look at the name of Xiao Ming are 1 hot strip, if there is his name lose 1 in the name of the red hot strip, plus 1 hot strip, thus completing the payment, the red on the phone heard two dog confirmed the transfer completed, you can rest assured that he took away the rubber.
中央虚拟货币
4年级的时候，老师天天收辣条，发纸币，都没有时间备课了，于是就把这个工作交给了学生会主席二狗子，承担起货币发行的责任。这个二狗子很聪明，他做了几天，发现好像也不用真的写那么多纸。完全可以这样：同学把纸币都交上来销毁，但是二狗子会记录下每个人上交的纸币数量。以后如果要进行付钱，例如小明要拿1辣条向小红换块橡皮，就一起给二狗子打电话，说明要将小明名下的1辣条划归小红名下，二狗子拿出账本，看看小明名下是否有1辣条，如果有就在小明的名下减掉1辣条，在小红的名下加上1辣条，这样就完成了支付，此时小红在电话中听到二狗子确认转账完成，就可以放心让小明把橡皮拿走。
At this time, the school entered the virtual currency age of the central system. Every student does not have to pay in kind, and the payment process becomes a change in the number of books on the account maintained by the two dog.
(the history of human use of drafts, passbook, bank card, credit card, including now Alipay, WeChat and so on are so)
此时学校进入了中央系统虚拟货币时代。每个同学都不需要用实物支付，支付过程变成了二狗子那边维护的账本上数字的变更。
（历史上人类使用了银票，存折，银行卡，信用卡，包括现在的支付宝，微信等都是如此）
The malpractice of the central system
The newly appointed two dog is a smart man, but the man is sometimes smart and clever. One day, two dogs stared at the book, thinking that the whole school had how much money I said, and I wasn't... So he had a hot head, and he drew 10 spicy strips to his own name from a small account. I thought it was seamless, but I didn't think that Xiao Ming had a habit of keeping accounts. One day he was going to pay and was told by two dogs that he had no money. Xiao Ming checked his own account book, and he had 10 spicy strips. So he took the account book to find two dog son theory. The check found the transfer which did not agree with Xiao Ming.
One's criminal conspiracy was unmasked！ Through this thing, we found the disadvantages of books concentrated in the hands of one person: this system is completely dependent on the account holders of credit, if the people do not follow the rules, tampering with the books, then the entire monetary system would collapse if the bedroom fire or the account is stolen, it will also bring a devastating blow to the whole system.
中央系统的弊端
这新上任的二狗子是聪明人，不过这人有时候是聪明反被聪明误。有一天二狗子盯着这账本，心想这全校谁有多少钱就是我说的算，那我岂不是……。于是他头脑一热，私自从小明帐下划了10辣条到自己名下。本以为天衣无缝，但没想到小明也有记账的习惯，有一天他正要付钱却被二狗子告知账户没钱了。小明核对了一下自己的账本，明明还有10辣条啊，于是拿着账本去找二狗子理论，这一核对发现了那笔未经小明同意的转账。
东窗事发！通过这件事，大家发现了账本集中在一个人手里的弊端：这个体系完全依赖于账本持有人的信用，如果这个人不守规矩，随意篡改账本，那么整个货币系统就会崩溃，如果这个人寝室失火或者账本失窃，同样也会为整个体系带来毁灭性的打击。
Distributed virtual currency
After the school has expelled the two dogs, they still have to continue to learn, and continue to deal, what do you do?
Finally in the second grade of junior high school, a two call in onion programming genius students out of their own pockets, give each student bought a microphone and a book, and in every corner of the school are arranged on the microphone, due to the original two dog currency mess in a complete mess in two books recommend, onion the abolition of the original two dog currency, to use a virtual currency account -- a new two coins, the coins issued a total of only 2100, and written on each account on the cover, two onions told every classmate, whenever I want to trade, then through the microphone broadcast the contents of their transactions for example:
Xiao Ming pays 1 and two coins to Xiao Hong
The students will write this sentence on his own personal account.
March 1, 2018: Xiao Ming pays 1 and two coins to Xiao Hong
All the students will know all the transaction records, and each transaction can verify whether the total amount is 21, if the students are afraid to miss, students will go in before trading with his collar table check books, and his books are updated to the new books.
Students soon discovered the advantages of two coins, which didn't need to go to Xiaoming's class, or even need two traders to face each other, so that they could complete reliable transactions in their classes and trade more quickly.
The middle two coins are now popular in the school.
分布式虚拟货币
学校把二狗子开除后，还是要继续学习，继续交易啊，怎么办呢？
终于在初中二年级的时候，一个叫中二葱的编程天才同学自己掏腰包，给每个同学买了一个话筒和一个账本，然后在学校的每个角落都布置上扩音器，由于原来的二狗子的货币账本乱得一塌糊涂，中二葱建议大家废除原来二狗子发行的货币，重新使用一种新的虚拟记账货币--中二币，这种币一共只发行2100个，而且写在每个账本的封面上，中二葱告诉每个同学，每当自己要交易时，就通过话筒把自己交易的内容广播出来，例如：
小明支付 1中二币 给 小红
听到的同学就会把这句话写在自己的个人账本上：
2018年3月1日：小明支付 1中二币 给 小红
这样所有的同学就都知道了所有的交易记录，而且每次交易都可以核实是否总量是21个，如果同学害怕听漏了，同学在交易前就会去和自己的领桌核对一下账本，并且把自己的账本更新成最新的账本。
同学们很快就发现了中二币的好处，这种交易方式不需要前往小明的班里，甚至不需要两个交易者面对面，在自己班里就能完成可靠的交易，交易更加快速。
中二币从此在学校里流行起来。。。。
