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比特币是公开的世界账本_LibraNews_LibraNews网

  小张在超市买了一堆东西,他来到收银台,刷卡结账走人,整个交易过程超市从头到尾都没有见到钞票,但是超市还是让小张带着东西走了,为什么?

  因为有银行。

  银行有一个账本,这个账本记着小张的账户里面有多少钱,同时也记着超市的账户里面有多少钱,小张刷卡的过程,就相当于打电话给银行说他们要交易,我们把交易流程逐条写下来:

  1)小张打电话告诉银行交易信息。

  2)银行就从保险柜里把账本拿出来,翻到小张的账户,提笔在小张账户那页纸上面写到:“某年某月某日某时某分,支出壹佰圆整,小张余额多少多少钱。”

  然后再翻出超市账户,在上面写到:“某年某月某日某时某分,收入壹佰圆整,超市余额多少多少钱。”

  3)银行打电话告诉超市已经完成了记账。

  4)交易完成,小张带着他的商品离开超市。

  当然这只是一个比方,如今银行为了提高效率,都使用了高端大气上档次的计算机,人力要半天完成的工作量,计算机瞬间就能完成。

  由此可见,交易不一定非得要有现钞,只要有一个交易双方都信任的账本,交易也能完成。

  但是,银行的这个账本对大众不是透明的,小张可以向银行家询问他自己账户的情况,但是银行是绝对不会告诉小张其他人账户情况的。

  这个账本是如此的重要,如果谁偷偷更改了这个账本,那效果和直接抢现钞一样。

  现在,如果有这样一种账本,账本里面记录这世界所有人的账户,小张手里有一本,超市手里有一本,全世界人手一本,所有账本都完全相同。

  小张带着他挑选的粮食、油和酒来到收银台,收银员算出一共是0.1个比特币。

  1)小张翻出他自己的账本,用笔在自己的账户上减去0. 1个比特币,在超市账户上增加0.1个比特币。

  2)然后小张给全世界每一个人打电话,告诉他们的交易信息,于是全世界每个人都立即找出账本,在小张的账户上减去0.1个比特币,在超市账户上增加0.1个比特币。

  3)超市打电话给全世界每一个人咨询是否已经完成了记账。

  4)交易完成,小张带着他的商品离开超市。

  交易完成后,当天晚上,小张就立即拿出自己的账本,把刚才的交易信息给涂没了,小张甚至还把超市的账本给偷出来,把超市的账本也给涂了,第二天,超市打电话把自己的账本和全世界其它账本一比较,立即发现有人做过手脚。

  超市得意了:“不懂了吧小样,只有更改了超出全世界50%的账本,才能真正更改交易信息。”

  如果是在互联网时代以前,这种账本是不可能存在的。

  1)靠打电话是不可能把一条交易信息迅速广播到全世界的。

  2)全世界任何一个地方发生交易,账本都要立即进行更新,如此巨大的信息量,你就是不吃不喝不睡不尿全天24小时奋笔疾书,也不可能完成。

  3)这可是记录了全世界账户的信息的账本,如果用A4纸写下来,可以堆满上一间仓库,你家里的衣柜绝对装不下。

  如今,互联网技术让一切由不可能变为可能。

  1)互联网能迅速把任何一条交易信息迅速广播到全世界,比打电话快的不知多少倍。

  2)虽然是处理全世界的交易信息,但对如今的CPU速度来说只是小菜一碟。

  3)数字储存技术让这个世界账本仅仅占据十几个G的空间,如今你在电脑城随便买个硬盘都上千G。

  但是,比特币程序运行起来一点都不占资源,你把它最小化,该玩游戏还玩游戏、该看网页还看网页,程序大小也就10兆左右,并不复杂,互联网上每一个运行比特币程序的电脑都被称为“节点”。

  节点具有以下功能:

  1)接听其它节点广播的交易信息;

  2)审核接收到的交易信息是否正确。

  3)把正确的交易信息记录到本地硬盘上的世界账本里。

  4)向其它节点广播自己接听到的合格信息,或者是广播自己的交易信息。

  你可以看做这是节点和节点之间相互打电话,这种纯粹节点之间的通讯,就叫做“点对点”,英语简称是“P2P”,这种通讯方式和我们常用的BT下载的原理是一模一样的。

  现在小张和超市进行比特币交易,只需要给这个程序输入交易信息,就能全部搞定,再也用不着给全世界每个人都打一通电话。

  最有趣的是,你可以用这个程序随机生成任意多个空白账户,只有在其它账户往你的空白账户里转入比特币之后,你的账户才在世界账本中出现。

  每个账户所展现的只是一串数字,和你人身信息没有半毛钱关系,尽管账本完全是透明的,除非你自己特意声明,否则没有人知道这个世界账本里面究竟哪几个账户是你的。

  每个账户都对应一个密码,只要你保管好自己的账户密码,那么账户里的比特币谁都动不了。

  不过,还是有些人会担心随着科技的发展,比如万能的量子计算机、最新最高深的数学原理等,比特币的密码将会面临被破解的可能,不过,如果真的有这么一天,你存在银行里的钱也同样不可靠。

  近几年来,比特币飙升的市值吸引了无数黑客,他们三天两头的攻击比特币交易网站盗取账户密码,偶尔走运撞到白痴网站他们也能得手。

  如果要对比特币系统本身下手,就必须攻破全世界超出50%的节点,这几乎是不可能的,这就是黑客们始终对比特币系统本身无计可施的原因。

  时间一长,黑客们也意识到比特币的安全可靠,而且比特币还是匿名的,不受银行的控制,实际上越来越多黑客们开始喜欢上了比特币,他们用病毒和木马攻击大小网站,然后他们会向受害者勒索比特币作为赎金。

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