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The largest transaction fee ever

mewald55

291.241 BTC was accidentally attached to this transaction in mid 2016, equivalent to $136K then, or $1.2M today.

The mining pool that claimed it, BitClub, offered to refund it if an entity could prove control of the sending address, but after some drama related with mixing services, half of the fee was instead donated to The Bitcoin Foundation.

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A collection of some large accidental fees

mewald55 -

A few of the largest accidental fees attached to transactions: 81 BTC, 50 BTC, 30 BTC, 16.95 BTC, 10.7 BTC, 4.6 BTC.

The 50BTC fee mined January 2017 is still an ongoing story... The fee was mined by 1Hash.com, and the creator of the transaction has been desperately trying to contact the mining pool to possibly receive a portion of it back. They have signed a message using the spending address, but there has been no word from 1Hash yet.

Story found here: https://medium.com/@jimmysong/man-pays-

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Accidental 200 BTC fee returned by ASICMiner

mewald55

Friedcat from ASICMinder was kind enough to return a 200 BTC fee on a transaction back in 2013.

Discussion found here: https://www.reddit.com/r/Bitcoin/comments/1lb5my/asicminer_refunds_the_accidental_200_btc/

BigFees