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Open multiple lightning channels in a single PayJoin with Nolooking on Umbrel
394 sats \ 6 comments \ @bitgould 6 Nov 2022 bitcoin
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12 sats \ 2 replies \ @Play_to_earn 7 Nov 2022 freebie
Nolooking How does it work?
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5 sats \ 1 reply \ @bitgould OP 8 Nov 2022
Funding channels on a lightning node can be a pain, especially for those unfamiliar with Bitcoin. First, I need to send funds to my node on-chain. Then I need to make another transaction to open channels. Instead, we can use the BIP 78 PayJoin P2EP protocol to fund and open channels in a single transaction.
A brand new node can become totally connected in a single transaction that opens channels to outbound peers, and could immediately swap for inbound capacity. Just by scanning a single QR code.
Here is an illustration of how the BIP 78 protocol pairs with the BOLT 2 Channel establishment protocol:
 ┌──────────────┐                ┌─────────────────┐                  ┌──────┐
 │Lightning Peer│                │My Lightning Node│                  │Sender│
 └──────┬───────┘                └───────┬─────────┘                  └───┬──┘
        │                                │                                │
        │            BOLT 2              ├─────── Bip21 with ?pj= ───────►│
        │     Channel Establishment      │                                │
        │                                │◄────── Original PSBT ──────────┤
        │                                │                                │
        │                                │                                │
        │◄──────── open_channel ─────────┤                                │
        │                                │                                │
        ├──────── accept_channel ───────►│                                │
        │                                │             BIP 78             │
        │                                │                                │
        │◄─────── funding_created ───────┤                                │
        │                                │                                │
        ├──────── funding_signed ───────►│                                │
        │                                │                                │
        │                                │        PayJoin Proposal        │
        │                                ├──────       PSBT       ───────►│
        │                                │                                │
        │                                │                                │
        │                                │    ┌─ PayJoin + Funding ───────┤
        │                                │    │     Transaction           │
        │                                │    │                           │
       x│xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx│xxx ▼ xxxxxxxxxxxxxxxxxxxxxxxxxx│x
       xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
       xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx BITCOIN NETWORK xxxxxxxxxxxxxxxxxxxxx
       xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
       x│xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx│xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx│x
        │                                │                                │
        │◄────────channel_ready ─────────┤                                │
        │                                │                                │
        ├──────── channel_ready─────────►│                                │
        │                                │                                │
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0 sats \ 0 replies \ @bitgould OP 8 Nov 2022
line numbers aren't right aligned k00b?
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10 sats \ 0 replies \ @TheBTCManual 7 Nov 2022
Very cool, I will have a look at this app a bit later, always glad to see new ways for people to break chain analysis
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0 sats \ 1 reply \ @tomlaies 6 Nov 2022
Pretty cool.
But I personally am not the first to jump the gun with new and complicated crypro :p
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11 sats \ 0 replies \ @bitgould OP 6 Nov 2022
While this release is experimental, there's no new crypto. Tried and true PSBTs on the P2EP protocol in use May 2020
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