Miner injects 3000 blocks in Ethereum Classic reorganizing the blockchain

Sunday 5 August 2020, 5:15 AM AEST - 3 days ago

Miner injects 3000 blocks in Ethereum Classic reorganizing the blockchainMiner injects 3000 blocks in Ethereum Classic reorganizing the blockchain 19

The Ethereum Classic blockchain was reorganized as a single miner injected around 3000 blocks into the blockchain.
Initially, the incident was perceived to have been caused by a 51 percent attack. However, developers later stated that the reorganization could have occurred due to the miner losing internet access while mining. To conduct a thorough analysis, Bitfly has asked all exchanges to pause withdrawals and deposits on the ETC blockchain.

Ethereum Classic block reorganization

According to a report by ETC developers, a miner inserted around 3000 blocks at block number 10904146 with a mining time of 12 hours. The developers believe that the miner was either mining offline or their difficulty could have been higher the current network difficulty while they were honestly mining .

All ETC Parity / OpenEthereum nodes could not handle the 3000 block reorganization from the Core – Geth chain. Subsequently, the blockchain split, making the network unstable. While Parity / OpenEthereum miners were mining on the original ETC chain, Core – Geth nodes continued to mine on the 3000 – block inserted chain.

An attack on the ETC chain?

The developers stated that the attack does not appear actively malicious as there was no double-spending observed. It could be that the miner lost access to the internet for a while leading to a 12 – hour long mining period and the insertion of 3000 blocks.

However, the incident might be a deliberate attack intended to split the chain. The investigation regarding the incident is ongoing and more information is expected to be released soon.

The 3000 blocks were mined with a mean of 0 transactions per block. Any transactions that werent mined will be re-submitted to the mempool during a re-org .

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