A lesser-known but vital privacy feature of a good Bitcoin wallet is independent fee calculation. Some lightweight wallets rely on a central server not only for balance information but also to calculate the appropriate fee for a transaction. This means the server operator could potentially see your transaction before it’s even broadcast. Mycelium avoids this privacy leak. The mycelium wallet calculates fees locally on your device. It constructs the transaction, determines its size in bytes, and, using its own fee estimation data gathered from the peer-to-peer network, calculates the required fee. This means no third party knows you are about to send a transaction, who you are sending it to, or how much you are sending until you broadcast it to the entire network yourself. This local calculation is another example of Mycelium’s commitment to a trustless model, ensuring that your financial activity remains private until the moment you decide to publicize it on the blockchain.