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TL;DR: A P2WPKH input should be conservatively estimated with 68.0 vbytes. Standard P2WPKH inputs generally weigh 67.75 or 68.0 vbytes, depending on whether the r-value in the signature is low or high. A wallet using signature grinding (which is highly recommended) will always produce 67.75 vbyte inputs. 68.0 vbytes is the conservative estimate allowing for ...

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