Isnt a directly taken "offer to pay" a proof? What do I dont see in the context?
Or you mean you need the proof for "accounting" purposes?
You need proof so clients can validate “yes this person paid the fee to publish”
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An LNURLW can still be revoked
Valid point.
And you mean having payment for spam is making it censorable, and you want a provably uncesorable sw. Right?