Co-authored-by: Jon Atack <jon@atack.com>
Co-authored-by: Samuel Dobson <dobsonsa68@gmail.com>
This is a backport of [[https://github.com/bitcoin/bitcoin/pull/19743 | core#19743]]
Notes:
- the Release notes are not relevant because they refer to a PR that we backported almost one year ago.
- the formula for computing a defaulti fee in Bitcoin ABC is `1 sat/byte * tx_size`, with `tx_size ~ 148 * n_in + 33 * n_out + 10`. The tx sizes in the log messages checked in this PR are consistent with this formula (and different from the way Core computes the fees).