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732021-03-09T20:08:47 <luke-jr> what is gained by not using a hash of the "key" in the spk?
742021-03-09T20:10:37 <belcher> pubkeys are visible so you can do ring signatures
752021-03-09T20:10:54 <belcher> thats a possible way of proving that a LN channel exists with greater privacy
762021-03-09T20:11:11 <belcher> prove that an LN channel exists without revealing the exact UTXO of it
772021-03-09T20:12:14 <belcher> also, as the public key is visible it can be tweaked to obtain another keypair for which the private key is also known... this is used by snicker coinjoin
782021-03-09T20:13:31 <belcher> (iv maybe tunnel-visioned on privacy, perhaps theres other improvements like greater efficiency because a hash function is avoided)
792021-03-09T20:15:25 <luke-jr> :o
802021-03-09T20:17:00 <luke-jr> belcher: couldn't you just include the pubkeys with the ring signature or such?
812021-03-09T20:17:48 <belcher> pubkeyhash hides the pubkeys from random people out there who would construct the ring signature
822021-03-09T20:18:16 <belcher> someone creating a ring signature can do it without needing to interact with the owner of the pubkey at all, as long as they know the pubkey
832021-03-09T20:18:44 <luke-jr> oh right
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882021-03-09T23:40:37 <ghost43> it also saves a tiny bit of space as instead of storing both the hash and the pubkey in the chain, only the pubkey is stored
892021-03-09T23:42:28 <ghost43> https://github.com/bitcoin/bips/blob/master/bip-0341.mediawiki#cite_note-2
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