<p>Around 12:00 am ET Thursday, another high-fee, mysterious <a href="https://etherscan.io/tx/0xc215b9356db58ce05412439f49a842f8a3abe6c1792ff8f2c3ee425c3501023c">Ethereum transaction</a> took place in which a sender sent $86,390 worth of ether (ETH) with transaction fees of around $2.6 million.</p> <p>This is a transaction from the <a href="https://www.theblockcrypto.com/linked/67881/ethereum-miner-says-it-has-frozen-a-2-5-million-fee-paid-alongside-a-133-transaction">same sender</a> who paid the same fees yesterday to send just $133 worth of ETH. Today’s transaction was mined by the Ethermine pool.</p> <p>“We believe that this was an accident and in order to resolve this issue the tx sender should contact us...immediately,” <a href="https://twitter.com/etherchain_org/status/1270927030817873920">tweeted</a> Bitfly, the operator of Ethermine.</p> <p>What’s going on? It's not clear, but Alex Manuskin, blockchain researcher at crypto wallet ZenGo, told The Block that it could be a bug and not a money-laundering scheme as some had <a href="https://www.theblockcrypto.com/linked/67881/ethereum-miner-says-it-has-frozen-a-2-5-million-fee-paid-alongside-a-133-transaction">suggested</a> for the first transaction.</p> <p>“A possible explanation could be a mix in the bot code between the sent value and the gas price,” said Manuskin. "This sender used to send a transaction every 1 minute or so, so this did not look like a human operator. Might be some sort of a trading bot, for some exchange, repeating the same operation.”</p> <p>The Block has reached out to Ethermine for further details and will update this story should we hear back.</p>