Sending the "same" 50,000 sats twice can cost different fees.
Your wallet holds many separate UTXOs, not one balance, and has to pick which ones to spend. Combine three small ones and the transaction is bigger (more fee). Spend one large one and it's smaller (less fee) — but now that big UTXO's history is linked to this payment too. Coin selection is a privacy/fee tradeoff made every time you hit send, mostly invisible to the user.
Your wallet holds many separate UTXOs, not one balance, and has to pick which ones to spend. Combine three small ones and the transaction is bigger (more fee). Spend one large one and it's smaller (less fee) — but now that big UTXO's history is linked to this payment too. Coin selection is a privacy/fee tradeoff made every time you hit send, mostly invisible to the user.
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