Large mining pools spammed the cryptocurrency blockchain with millions of transactions. Because of this, users were forced to overpay for the transfer of coins.
A spam attack on the Ethereum network took place. Miners filled the cryptocurrency blockchain with tens of thousands of transactions for insignificant amounts. In a number of transfers, the volume of cryptocurrency sent did not exceed 0.001 ETH ($ 0.23), Trustnodes reports.
Portal analysts said that mining pools are responsible for the attack. For example, on June 24, the Ethermine pool completed more than 13 thousand transactions. Since the start of spam, SparkPool and Nanopool pools have made an even greater contribution, during this period they made 6 million and 15 million transfers, respectively.
As a result, the Ethereum network was overloaded. On June 24, when the attack peaked, the cryptocurrency blockchain processed more than a million transactions. In total, mining pools carried out more than 50 million transfers in small amounts. This led to the fact that at times the average transaction cost increased to $ 0.75, and users were forced to pay $ 5-10 for using smart contracts.
In late May, an overload happened with the Bitcoin network. In the blockchain of the first cryptocurrency, a queue of unconfirmed transactions formed, and the size of the commission charged by miners increased by 7-10 times compared to April.