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गुरुवार, 2 दिसंबर 2021
दोगुनी रफ्तार : जिस स्तर पर पहुंचने में डेल्टा-बीटा को 100-100 दिन लगे, ओमिक्रॉन 10 दिन में पहुंचा
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जल संकट: दिल्ली के इन इलाकों में आज नहीं आएगा पानी, पर्याप्त मात्रा में भंडारण करने की अपील
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Smart Contract Bug Results in $31 Million Loss
By Bruce Schneier
A hacker stole $31 million from the blockchain company MonoX Finance , by exploiting a bug in software the service uses to draft smart contracts.
Specifically, the hack used the same token as both the tokenIn and tokenOut, which are methods for exchanging the value of one token for another. MonoX updates prices after each swap by calculating new prices for both tokens. When the swap is completed, the price of tokenInthat is, the token sent by the userdecreases and the price of tokenOutor the token received by the userincreases.
By using the same token for both tokenIn and tokenOut, the hacker greatly inflated the price of the MONO token because the updating of the tokenOut overwrote the price update of the tokenIn. The hacker then exchanged the token for $31 million worth of tokens on the Ethereum and Polygon blockchains.
The article goes on to talk about how common these sorts of attacks are. The basic problem is that the code is the ultimate authority — there is no adjudication protocol — so if there’s a vulnerability in the code, there is no recourse. And, of course, there are lots of vulnerabilities in code.
To me, this is reason enough never to use smart contracts for anything important. Human-based adjudication systems are not useless pre-Internet human baggage, they’re vital.
December 2, 2021 at 06:32PM
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आम आदमी को झटका: एक जनवरी से महंगी हो जाएगी एटीएम से धन निकासी
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हरियाणा: बढ़ने लगे कोरोना के मामले, गुरुग्राम फिर बन रहा हॉट स्पॉट, जानें- किस जिले में कितने केस
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अमेरिका: ओमिक्रॉन के तीसरे मामले की भी पुष्टि, अंतरराष्ट्रीय यात्रियों के लिए कोविड टेस्ट अनिवार्य, अगले हफ्ते से नए नियम
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सबसे बड़ा विनिर्माण हब : गुजरात ने महाराष्ट्र को पीछे छोड़ा, आरबीआई के आकड़ों के अनुसार निवेश ने दिलाई बढ़त
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