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Add instructions for dual funded channel opens #5

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Add instructions for dual funded channel opens #5

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22 changes: 21 additions & 1 deletion README.md
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Expand Up @@ -19,7 +19,8 @@
3. [Force disconnect from a Lightning peer](#force-disconnect-from-a-lightning-peer)
4. [Open a channel to a connected peer](#open-a-channel-to-a-connected-peer)
5. [Open multiple channels in one transaction](#open-multiple-channels-in-one-transaction)
6. [Close a channel](#close-a-channel)
6. [Open a dual funded channel](#open-a-dual-funded-channel)
7. [Close a channel](#close-a-channel)
4. [Lightning Payments](#lightning-payments)
1. [Pay an invoice](#pay-an-invoice)
2. [Pay an invoice using a specific route](#pay-an-invoice-using-a-specific-route)
Expand Down Expand Up @@ -188,6 +189,25 @@ lightning-cli fundchannel
lightning-cli multifundchannel
```

### Open a dual funded channel
>**Note**: This requires `--experimental-dual-fund` to be enabled.
> Learn more about [dual funded channels](https://medium.com/blockstream/setting-up-liquidity-ads-in-c-lightning-54e4c59c091d).

First your need to find nodes that offer dual funding
```
lightning-cli listnodes | jq '.nodes[] | select(.option_will_fund != null)'
```

Open a dual funded channel of total size Z, where we contribute amount X and the remote peer amount Y. The channel open operation is a collaborative transactions between both peers (aka coinjoin). The amount we contribute will be our initial Outbound liquidity (=spending capacity) of the channel, while the requested amount from the peer will be our Inbound liquidity (=receiving capacity).
```
lightning-cli fundchannel -k id=<peer_id> amount=<our_amount_sat> request_amt=<requested_amount_from_peer_sat> compact_lease=<compact_lease_from_previous_command>
```

We can also open a dual funded channel by selecting whole utxos, to avoid having any change outputs.
```
lightning-cli fundchannel -k id=<peer_id> amount=all request_amt=<requested_amount_from_peer_sat> compact_lease=<compact_lease_from_previous_command> utxos='["c8afe317789f3ecbd52893d2ac08be7499486df5a03c95ad063e395e931eb50a:1", "<txid>:<vout>"]'
```

### Close a channel
Attempt to coordinate a mutual channel close with the specified peer.
```
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