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1

Coin selection algorithm in Bitcoin Core is weird and lot of other users had similar issues in past. Example: https://github.com/bitcoin/bitcoin/issues/20598 There are few open PRs and few PRs that recently got merged which might change few things although I am not sure as I did not review them. Apart from fees related issues, there can be some privacy ...


2

Bitcoin Core's coin selection algorithm has had multiple improvements in the past years. More recent versions of Bitcoin Core (0.17.0+) will attempt to select an input set that does not require a change output. If you are on a sufficiently recent version of Bitcoin Core, it should find and prefer such a solution if one is possible. This means that either the ...


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