From ZmnSCPxj at protonmail.com Thu Feb 22 15:58:15 2018 From: ZmnSCPxj at protonmail.com (ZmnSCPxj) Date: Thu, 22 Feb 2018 10:58:15 -0500 Subject: [Lightning-dev] Privacy issues with proof of payment In-Reply-To: <08e75369-09e4-dfdd-d5f5-6c811ac17116@bitonic.nl> References: <08e75369-09e4-dfdd-d5f5-6c811ac17116@bitonic.nl> Message-ID: Good morning Corne, My understanding, it would be possible to remove proof-of-payment selectively by hiding the payment in fees. Basically, to anonymously donate money to a node without leaving proof of who you are, you simply route from yourself to the payee node, then back to yourself. You pay yourself the minimum HTLC forwarding amount, and leave a hefty fee to the payee node. The payee cannot prove that you paid to it; as far as it is concerned it was just a payment forwarding. The payer cannot prove that it paid the payee, since anyone on the route other than the payee could have been the source of the payment. This assumes that the payer does not control the entire route, at least. Regards, ZmnSCPxj