Hey Subhra – In order to have faith that the channel announced by the nodes is
actually locked on the Bitcoin mainchain we need to have the outpoint (`txid`
and `vout`) of the funding transaction. If we do not verify that the funding
transaction has been confirmed, nodes can cheat us that a particular
transaction is confirmed when it is not the case. As a result we require that
nodes announce this information along with the public keys and the signatures
of the public keys that was used to lock the funding transaction.
This information is broadcasted in the `channel_announcement` message in the
`short_channel_id` field which includes the block number, transaction number
and vout. Since Bitcoin does not allow confidential transactions, we can query
the blockchain and find out the channel capacity even when the amounts are
never explicitly mentioned.
Ugam
From: Lightning-dev <lightning-dev-boun...@lists.linuxfoundation.org> On Behalf
Of Subhra Mazumdar
Sent: Monday, January 27, 2020 12:45 PM
To: lightning-dev@lists.linuxfoundation.org
Subject: [Lightning-dev] Not revealing the channel capacity during opening of
channel in lightning network
Dear All,
What can be the potential problem if a channel is opened whereby the
channel capacity is not revealed publicly but just a range proof of the
attribute (capacity >0 and capacity < value) is provided ? Will it pose a
problem during routing of transaction ? What are the pros and cons ?
I think that revealing channel capacity make the channels susceptible to
channel exhaustion attack or a particular node might be targeted for node
isolation attack ?
--
Yours sincerely,
Subhra Mazumdar.
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