Reminder 0 conf bitcoin is not bitcoin is PVP. Best of luck to you out there.
Discussion
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Nevertheless, 0-conf txs can be useful for LSP
https://lightningdevkit.org/blog/zero-confirmation-channels/
Also if you open such channels between your own public node and another private one, and never confirm them onchain, you can transact over LN endlessly without any trace of UTXO.