A Bitcoin user mistakenly paid over $60,000 in transaction fees due to a misunderstanding of fee units while attempting to use the replace-by-fee (RBF) feature. The user intended to expedite a transaction by increasing the fee but confused sat/vB (satoshis per virtual byte) with total satoshis. As a result, their wallet applied an exorbitant fee of 305,000 sats/vB instead of a reasonable amount. The user sent 0.48 BTC and accidentally assigned 0.75 BTC as a fee instead of directing it to their change address, incurring a massive loss. This incident highlights the importance of understanding fee structures when managing Bitcoin transactions, particularly when adjusting fees or using advanced wallet options. Users are advised to verify fee units, use trusted wallets, and follow automated fee suggestions to avoid such costly mistakes. RBF can be a useful tool but requires careful handling due to its complexities.

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