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Author Topic: POW和POS简介  (Read 185 times)
xiaoxz
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March 05, 2018, 01:02:50 AM
 #1

每一种加密货币背后,都有一种共识机制,它们各有优略。在加密货币的世界里,共识机制的存在是为了防止双重支付的攻击(double spending attack)。
共识机制的世界里面,最普遍的两种机制,就是POW和POS。

工作量证明机制(Proof-of-Work, POW)

工作量证明机制是第一个区块链的共识算法:由中本聪修订,在比特币的区块链网络中使用。也正因为有了POW,巨大的挖矿设备出现的同时也消耗了无数能源。POW的确能够运行,但在现阶段它已经逐渐被认定为遗留和落后的技术。
以太坊甚至试图从POW迁移至更加节能和有经济效率的POS(Proof-of-Stake, 权益证明机制)。
随着许多替代方案的出现,已经很难看见新的区块链使用POW了。

权益证明机制 (Proof-of-Stake, POS)

在POS中,区块不是由矿工工作而产生,而是铸币者(minter)使用权益(即代币)去打赌(bet)哪一个区块是有效的。
如果遇上分叉,铸币者花费他们的代币去投票支持某一个分叉链。假设大多数人投票给正确的分叉链(correct fork),那么投票给错误的分叉链的验证者(validator)将失去他们的权益。
有关权益机制的最普遍的争论是"无权益问题"(Nothing at Stake)。问题在于,既然验证者几乎不用花费算力去支持分叉,验证者可以支持所有发生的分叉。POS中的分叉然后就会变得比POW中更加普遍,这使得一些人担忧货币的信誉会受到损害。

我们可以从BCT论坛上发现,最近发布的很多节点币,都不会单纯的POW和POS,而是2种的结合。
当然,现在有越来越多的共识机制出现,那些我将下一篇文章中介绍。
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hanguoip
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March 05, 2018, 06:37:21 PM
 #2

谢谢楼主的分享,绑定下让新手看看也好
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March 05, 2018, 07:25:53 PM
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不錯的科普文,又學到了新的東西
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March 05, 2018, 07:56:49 PM
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很有用 Tongue
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March 06, 2018, 12:28:51 AM
 #5

红筹论坛欢迎大家。

更多币资料及钱包使用~有带图的教程。


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March 06, 2018, 04:44:33 AM
 #6

太简单了,看的有点生硬,能配图就更好了

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March 06, 2018, 08:16:14 AM
 #7

工作量证明机制

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March 06, 2018, 08:16:47 AM
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落后的技术。

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March 06, 2018, 08:25:00 AM
 #9

共识算法

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March 06, 2018, 08:31:28 AM
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由中本聪修订
shepherdz
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March 06, 2018, 08:31:51 AM
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每一种加密货币背后

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March 13, 2018, 08:02:14 PM
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 Grin
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March 13, 2018, 09:29:31 PM
 #13

thank u for your share

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March 14, 2018, 01:17:04 AM
 #14

我个人感觉,pow的机制应该是最安全的机制,没有之一,因为大家都是通过贡献算力来获得报酬的。
我想pos的这一种共识,完全可以没有任何成本的,所以我觉得这种,虽然说是节能,但正是因为这样,所以才可能毫无价值。
manceNN
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March 14, 2018, 01:57:28 AM
 #15

我个人感觉,pow的机制应该是最安全的机制,没有之一,因为大家都是通过贡献算力来获得报酬的。
我想pos的这一种共识,完全可以没有任何成本的,所以我觉得这种,虽然说是节能,但正是因为这样,所以才可能毫无价值。
pos就是手中的币越多的人越牛逼是吗?

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March 14, 2018, 02:02:15 AM
 #16

感谢版主,有个问题就是pos和pow的结合要怎么实行?
batoman
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April 02, 2018, 01:55:01 PM
 #17

虽然不节能,但我还是更喜欢pow挖矿模式
jiangzong
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April 14, 2018, 05:02:03 AM
 #18

我个人感觉,pow的机制应该是最安全的机制,没有之一,因为大家都是通过贡献算力来获得报酬的。
我想pos的这一种共识,完全可以没有任何成本的,所以我觉得这种,虽然说是节能,但正是因为这样,所以才可能毫无价值。
pow是最好的,有成本。
meida
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April 14, 2018, 05:24:14 AM
 #19

可以可以,谢谢楼主的科普,又学到了一点东西,很开心,希望这样的科普帖子可以有更多一点。

likuck
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April 14, 2018, 06:05:24 AM
 #20

还是比特币靠谱,哈哈。

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