Golden Finance reports that Foundry USA Pool, the Bitcoin mining pool with the highest total hash rate, has refunded an inadvertently paid Bitcoin transaction fee worth approximately $777,000 (8.18 BTC). On December 19, Foundry USA Pool mined Bitcoin block 875475, which included a transaction where the sender attached a fee of 8.18 BTC, exceeding the necessary fee by 91,127 times. On Friday, Foundry posted on social media that it had contacted the sender who "accidentally" paid the fee. The mining pool confirmed that it refunded the transaction fee to the sender after "careful consideration"; otherwise, this fee would have been allocated to the mining customers contributing hash power to the Foundry pool.