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06eb44af7d
We now support splicing on public channels: once the splice transaction is confirmed and locked on both sides, nodes will exchange announcement signatures that allows them to create a `channel_announcement` that they then broadcast to the network. This requires reworking the data model to include the announcement and the real `short_channel_id` in each commitment, which lets us cleanly distinguish real `short_channel_id`s from aliases (which are set at the channel level regardless of the current commitments). The flow now becomes: - when the funding transaction of a commitment confirms, we set the corresponding real `short_channel_id` in that commitment - if the channel is public and we've received `channel_ready` or `splice_locked`, we send our `announcement_signatures` - if we receive `announcement_signatures` for a commitment for which the funding transaction is unconfirmed, we stash it and replay it when the transaction confirms - if we receive `announcement_signatures` for a confirmed commitment, and we don't have a more recently announced commitment, we generate a `channel_announcement`, store it with the commitment and update our router data When creating a `channel_update` for a public channel, we always use the `short_channel_id` that matches the latest announcement we created. This is very important to guarantee that nodes receiving our updates will not discard them because they cannot match it to a channel. For private channels, we stop allowing usage of the `short_channel_id` for routing: `scid_alias` MUST be used, which ensures that the channel utxo isn't revealed. Note that when migrating to taproot channels, `splice_locked` will be used to transmit nonces for the announcement signatures, which will be compatible with the existing flow (and similarly, `channel_ready` will be used for the initial funding transaction). They are retransmitted on reconnection to ensure that the announcements can be generated. |
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