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I noticed that when I call listunspent on Bitcoin Core, UTXO with 0 confirmation are labeled unsafe, and thus prevented from being spent with sendtoaddress or fundrawtransaction. As soon as there's one confirmation the tx is safe and I can spend it.

Being able to modify the target for a tx to be considered safe, for example set it to 3 or 6 confirmations instead of just 1, would make my life easier, but I can't find an option for it. Is there some way to do it?

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    You could set minconf=3 or minconf=6 for that matter; you can also parse depending on the confirmations field instead of the safe one.
    – Antoine Poinsot
    Commented Jun 6, 2020 at 14:06

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From the documentation:

listunspent ( minconf maxconf ["address",...] include_unsafe query_options )

Returns array of unspent transaction outputs with between minconf and maxconf (inclusive) confirmations.

so listunspent 3 would work for you?

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  • Yes that's what I do now, but I was wondering if there was a way to modify the safe parameter to totally avoid the risk of picking an UTXO that have less than x confirmations in a transaction. You can also use the lockunspent command for the same purpose.
    – Sosthène
    Commented May 14, 2020 at 10:40
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    You'd need to recompile Core for that.
    – MCCCS
    Commented May 14, 2020 at 11:36

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