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[20150720]Blockcypher:比特币交易零确认仍然可行
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Topic: [20150720]Blockcypher:比特币交易零确认仍然可行 (Read 383 times)
Ingatqhvq
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[20150720]Blockcypher:比特币交易零确认仍然可行
July 20, 2015, 08:25:42 AM
#1
Blockcypher是一家为大型机构如交易所和支付服务提供商,提供比特币钱包服务的公司。由于最近出现的“尘额”交易造成比特币网络的拥挤,BlockCypher的一个大客户,埃里克•沃里斯(Erik Voorhees)的ShapeShift.io遭受了双花攻击,损失了2.6 BTC。
Blockcypher提供的最重要的服务就是他们所称的“置信因子”(Confidence Factor)技术,如果Blockcypher处理器有合理的理由确定(即99%以上)双花攻击不会被发起,那么交易就会以零确认来处理。对此,Blockcypher这样描述道:
“简单来说,如果一个未经确认的交易反馈了99.9%的置信因子,那么我们的数据就会明确双花将有0.1%的机会成功。在设计上,我们是保守的。即使当我们确认有90%的置信因子,一个双花成功的可能性也明显低于10%。”
对于像ShapeShift这样交易平台来说,拥有快速交易的能力是他们成功的关键。因为这可以促进其平台上数字货币的即时转换。对于Bitnet来说,“置信因子”这项技术也是非常有用的,过去几个月,Bitnet与好几家支付提供商达成了合作伙伴关系,比如Cardinal Commerce,一家大型支付提供商。因此对于他们来说,拥有快速无障碍处理交易的能力是其商业模式的关键,所以他们如今整合Blockcypher的“置信因子”技术也是必然的。
超过10万双花
双花是如何发生的呢?对此还尚不明确,但是BlockCypher的一位代表乔什•辛辛那提(Josh Cincinnati)对此发表了一篇有见地的博客,博客中解释说,用于执行双花的攻击向量已经得到了修补。辛辛那提说,我们公司会在任何成功的双花攻击后,对其算法进行不断地改进,而且我们已经系统地改进了零确认交易,降低了其被双花攻击的可能性。
他写道:
“事实上,我们已经看到了几十种不同类型的双花尝试进行攻击,一些成功了,一些没有成功。所有这些案例 ,包含最近一次的,都为我们提供了有益的借鉴,使我们不断提高“置信因子”技术。99.989%的双花攻击,其“置信因子”都是不到90%,甚至更少。我们的“置信因子”,即使是低于90%,也能做很好地担起过滤最有问题、最有风险的交易。”
他说,有超过10万个双花尝试攻击网络,ShapeShift也是在此时间段内遭到了双花攻击,但是在如此多的双花攻击中,只有11个双花的“置信因子” 被BlockCypher的“置信因子”技术评估超过90 %。这些数量庞大的双花攻击如果都成功的话,可能会对网络造成极大的伤害,但幸运的是他们没有成功。
Wei H
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Activity: 1192
Merit: 1001
Chinese translator
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Re: [20150720]Blockcypher:比特币交易零确认仍然可行
July 20, 2015, 01:22:24 PM
#2
扯淡,0.1%的失败可能就够了。
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[20150720]Blockcypher:比特币交易零确认仍然可行
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