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From: Burak Keceli <burak@buraks.blog>
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Cc: Bitcoin Protocol Discussion <bitcoin-dev@lists.linuxfoundation.org>
Subject: Re: [bitcoin-dev] Ark: An Alternative Privacy-preserving Second
Layer Solution
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> You can also do the same in Lightning, with the same risk profile: the LS=
P opens a 0-conf channel to you, you receive over Lightning, send out over =
Lightning again, without waiting for onchain confirmations.
This is not correct. If an LSP opens a zero-conf channel to me, I cannot re=
ceive over lightning immediately because I have to wait for that channel to=
confirm before revealing my preimage for the payment. If I don=E2=80=99t, =
LSP takes the sender=E2=80=99s money yet double-spends my channel.
This is not the case with Ark. Ark ensures "absolute atomicity" by using AT=
LCs instead of HTLCs. Users can receive payments and forward them further w=
ithout waiting for on-chain confirmations. A double-spend attempt breaks th=
e entire atomicity. An ASP cannot redeem senders=E2=80=99 vTXO(s) if they d=
ouble-spend recipients' vTXO(s).
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