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75% of Bitcoin SV [BSV] hashrate is contained in 4 nodes, double-spending 0-conf transactions possible, discovers programmer

Anirudh VK

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75% of Bitcoin SV [BSV] hashrate is contained in 4 nodes, double-spending 0-conf transactions possible, discovers programmer
Source: Unsplash

Bitcoin Satoshi’s Vision [BSV] has been in the news recently due to its inflated price growth over the past week. However, a programmer and computer security researcher is known as Reizu recently found that, among other things, it is possible to double spend a zero-confirmation transaction on the BSV chain.

He also discovered that the hashrate on the network is also highly concentrated, with just 4 nodes controlling over 75% of the hashrate, out of the 450 nodes on the network. He begins by saying that double spending a 0-conf transaction is possible, but restricted by multiple real-world limitations. These include the fact that the propagation of transactions is very fast on the Bitcoin network, and that miners follow the “first seen safe” rule.

Moreover, whenever fees of greater than 1 satoshi/byte are used, the transaction is considered safe. In case of double-spending actually occurring, it is easy to detect it by connecting to several different nodes and waiting for 5 seconds, as that would effectively show if transactions have the same output.

Reizu stated that the main reason he picked Bitcoin SV is that the community believes that 0-conf transactions are safe, and said that he wanted to see whether it was possible to send a transaction to one node and another transaction with the same input to another node. He discovered that he indeed could, and presented a short tutorial doing so, using a tool known as izubitcoin.

The tool has some features that enable this, such as using parallelization to connect to each node on the network and connecting to the Bitcoin protocol natively. He explained:

“Once connected to the remote nodes (after a few seconds) I send a signal to the processes. Upon receipt, each thread sends the transaction to their node and disconnects. In this way the synchronization is very effective.”

The condition is exploited on the BSV network with a success rate between 90% and 97%, with a simultaneous connection to all the nodes on the network allowing for a precise control over the distribution of the transactions.

When trying to discover whether double spending was possible by sending the first transaction to a set of non-mining nodes and the second to a minority of mining nodes, he saw that the mined transactions were always sent to the same nodes. This confirms that the mining of the BSV chain is very centralized. More specifically:

“34% of the hashrate is only 1 node. 59% of the hashrate are 2 nodes. 68% of the hashrate are 3 nodes. 75% of the hashrate are 4 nodes.”

The programmer further said that he has double-spent many transactions on the BSV network, with a 90% success rate if the second transactions are sent to 6 nodes and a 100% success rate if sent to 20 nodes. He further found that the difficulty of double-spending is proportional to the number of nodes on the network and that doing it is “practically free”, as one needs only an internet connection and a mid-range or high-end router.

Moreover, this method works even if all miners are honest, which opens up the BSV network to a host of double spend attacks. Even as the network is presenting itself as one of the biggest payment networks of the next decade, this exploit must be fixed before it can compete for the position.

Double-spending 0-conf POP! BSV from reizu on Vimeo.





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Anirudh VK is a full-time journalist at AMBCrypto. He has a passion for writing and interest towards the future of blockchain technology and cryptocurrencies. He does not own any cryptocurrencies currently.

Altcoins

Binance coin pumps by over 6% in an hour; breaks its all-time high

Namrata Shukla

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Source: Pixabay

On June 20, Binance coin [BNB], a coin ranked seventh on CoinMarketCap, surged by a massive 6.38% over the past hour. The coin also broke its all-time high and was trading at $36.47, at press time.

Source: Trading view

Source: Trading view

At press time, BNB was being traded at $36.47 with a market cap of $5.097 billion. The 24-hour trading volume of the coin was reported to be $571.64 million, as it spiked by 2.35% over the day. Over the past seven days, the coin noted a rise of 2.03% in its price and continued to rise by 6.38% within the hour.

This hike follows Singapore-based cryptocurrency exchange, KuCoin, listing Binance coin [BNB] and Binance announcing the launch of Elrond project on Binance launchpad. Binance funded the sharding-based public blockchain network in a private funding round, as the company closed the round with $1.9 million. It will be the next project supported by Binance launchpad and the token sale will be carried out in a lottery fashion. The token sale is scheduled to begin from June 22, 00:00 AM [UTC].

The coin was highly traded on Binance exchange with BNB/USDT pair and BNB/BTC pair. BNB/USDT took the first place as it noted a 24-hour trading volume of $137 million, followed by BNB/BTC which reported a volume of $126 million. The third position was taken by LBank exchange, which registered a trading volume of $120 million with BNB/USDT pair.





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