新闻来源连结： https://www.ccn.com/bitcoin-gold-hit-by-double-spend-attack-exchanges-lose-millions/ 新闻本文： Join our community of 10 000 traders on Hacked.com for just $39 per month. A malicious miner successfully executed a double spend attack on the Bitcoin Gold network last week, making BTG at least the third altcoin to succumb to a network attack during that timespan. Bitcoin Gold director of communications Edward Iskra first warned users about the attack on May 18, explaining that a malicious miner was using the exploit to steal funds from cryptocurrency exchanges. To execute the attack, the miner acquired at least 51 percent of the network’ s total hashpower, which provided them with temporary control of the blockchain. Obtaining this much hashpower is incredibly expensive — even on a smaller network like bitcoin gold — but it can be monetized by using it in tandem with a double spend attack. After gaining control of the network, the attacker began depositing BTG at cryptocurrency exchanges while also attempting to send those same coins to a wallet under their control. Ordinarily, the blockchain would resolve this by including only the first transaction in the block, but the attacker was able to reverse transactions since they had majority control of the network. Consequently, they were able to deposit funds on exchanges and quickly withdraw them again, after which they reversed the initial transaction so that they could send the coins they had originally deposited to another wallet. bitcoin gold Source: BTG Explorer A bitcoin gold address implicated in the attack has received more than 388,200 BTG since May 16 (mostly from transactions it sent to itself). Assuming all of those transactions were associated with the double spend exploit, the attacker could have stolen as much as $18.6 million worth of funds from exchanges. The last transaction was sent on May 18, but the attacker could theoretically attempt to resume it if they still have access to enough hashpower to gain control of the blockchain. Bitcoin gold’s developers advised exchanges to address the attack by increasing the number of confirmations required before they credit deposits to customer accounts. Blockchain data indicates that the attacker successfully reversed transactions as far back as 22 blocks, leading developers to advise raising confirmation requirements to 50 blocks. At present, bitcoin gold ranks as the 26th-largest cryptocurrency, with a circulating market cap of $827 million. Bitcoin gold is at least the third cryptocurrency network hit with a major attack in the past week alone. As CCN reported, a miner manipulated two of privacy coin verge’s five hashing algorithms to maliciously mine more than 35 million XVG — worth ~$1.75 million — in just a few hours. Previously, Japanese cryptocurrency monacoin was hit by an apparent block withholding attack after a miner gained as much as 57 percent of the network’s hashrate. Featured Image from Shutterstock 评论： 没想到有机会可以见证到51%算力攻击 -- 「不需要让青少年有判断力和批判力。只要给他们汽车、摩托车、美丽的明星、刺激的音 乐、流行的服饰，以及对同伴的竞争意识就行了。剥夺青少年的思考力，根植他们服从指 导者命令的服从心才是上策。让他们对批判国家、社会和指导者保持着一种动物般原始的 憎恶。让他们深信那是少数派和异端者的罪恶。让他们都有同样的想法。让他们认为想法 和大家不同的人就是国家的敌人……」 by 阿道夫·希特勒 --

※ 发信站: 批踢踢实业坊(ptt.cc), 来自: 118.163.51.199 ※ 文章网址: https://webptt.com/cn.aspx?n=bbs/DigiCurrency/M.1527153673.A.229.html 原来如此，因为没有特别关切XVG ※ 编辑: e12518166339 (118.163.51.199), 05/24/2018 17:29:19