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Enable 0conf and 0reserve on channels with trusted peers #853

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663864a
Enable 0conf and 0reserve on channels with trusted peers
tankyleo Mar 28, 2026
d44c10e
f: the trusted peers 0 reserve list now only applies to accepted chan…
tankyleo Mar 31, 2026
2502910
f: use `rev` to pin the dependency instead of `branch`
tankyleo Mar 31, 2026
27bc80c
Add `LSPS2ServiceConfig::allow_client_0reserve`
tankyleo Mar 31, 2026
e0146c3
Add `set_0reserve` parameter to `Node::open_channel_inner`
tankyleo Mar 31, 2026
9125870
Add `Node::{open_0reserve_channel, open_0reserve_channel_with_all}`
tankyleo Mar 31, 2026
aa005f4
f: Highlight the list only applies to inbound channels
tankyleo Apr 3, 2026
c1e1b51
f: Update bindings with `open_0reserve_channel` methods
tankyleo Apr 3, 2026
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26 changes: 13 additions & 13 deletions Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -39,17 +39,17 @@ default = []
#lightning-liquidity = { version = "0.2.0", features = ["std"] }
#lightning-macros = { version = "0.2.0" }

lightning = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "dcf0c203e166da2348bef12b2e5eff4a250cdec7", features = ["std"] }
lightning-types = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "dcf0c203e166da2348bef12b2e5eff4a250cdec7" }
lightning-invoice = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "dcf0c203e166da2348bef12b2e5eff4a250cdec7", features = ["std"] }
lightning-net-tokio = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "dcf0c203e166da2348bef12b2e5eff4a250cdec7" }
lightning-persister = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "dcf0c203e166da2348bef12b2e5eff4a250cdec7", features = ["tokio"] }
lightning-background-processor = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "dcf0c203e166da2348bef12b2e5eff4a250cdec7" }
lightning-rapid-gossip-sync = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "dcf0c203e166da2348bef12b2e5eff4a250cdec7" }
lightning-block-sync = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "dcf0c203e166da2348bef12b2e5eff4a250cdec7", features = ["rest-client", "rpc-client", "tokio"] }
lightning-transaction-sync = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "dcf0c203e166da2348bef12b2e5eff4a250cdec7", features = ["esplora-async-https", "time", "electrum-rustls-ring"] }
lightning-liquidity = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "dcf0c203e166da2348bef12b2e5eff4a250cdec7", features = ["std"] }
lightning-macros = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "dcf0c203e166da2348bef12b2e5eff4a250cdec7" }
lightning = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "688544da72cb348e4405d39a75e4d81102c1278a", features = ["std"] }
lightning-types = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "688544da72cb348e4405d39a75e4d81102c1278a" }
lightning-invoice = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "688544da72cb348e4405d39a75e4d81102c1278a", features = ["std"] }
lightning-net-tokio = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "688544da72cb348e4405d39a75e4d81102c1278a" }
lightning-persister = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "688544da72cb348e4405d39a75e4d81102c1278a", features = ["tokio"] }
lightning-background-processor = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "688544da72cb348e4405d39a75e4d81102c1278a" }
lightning-rapid-gossip-sync = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "688544da72cb348e4405d39a75e4d81102c1278a" }
lightning-block-sync = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "688544da72cb348e4405d39a75e4d81102c1278a", features = ["rest-client", "rpc-client", "tokio"] }
lightning-transaction-sync = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "688544da72cb348e4405d39a75e4d81102c1278a", features = ["esplora-async-https", "time", "electrum-rustls-ring"] }
lightning-liquidity = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "688544da72cb348e4405d39a75e4d81102c1278a", features = ["std"] }
lightning-macros = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "688544da72cb348e4405d39a75e4d81102c1278a" }

bdk_chain = { version = "0.23.0", default-features = false, features = ["std"] }
bdk_esplora = { version = "0.22.0", default-features = false, features = ["async-https-rustls", "tokio"]}
Expand Down Expand Up @@ -79,13 +79,13 @@ async-trait = { version = "0.1", default-features = false }
vss-client = { package = "vss-client-ng", version = "0.5" }
prost = { version = "0.11.6", default-features = false}
#bitcoin-payment-instructions = { version = "0.6" }
bitcoin-payment-instructions = { git = "https://github.com/joostjager/bitcoin-payment-instructions", branch = "ldk-dcf0c203e166da2348bef12b2e5eff4a250cdec7" }
bitcoin-payment-instructions = { git = "https://github.com/tankyleo/bitcoin-payment-instructions", rev = "654c25c2c1234fadf01adec1554497610f554f09" }

[target.'cfg(windows)'.dependencies]
winapi = { version = "0.3", features = ["winbase"] }

[dev-dependencies]
lightning = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "dcf0c203e166da2348bef12b2e5eff4a250cdec7", features = ["std", "_test_utils"] }
lightning = { git = "https://github.com/lightningdevkit/rust-lightning", rev = "688544da72cb348e4405d39a75e4d81102c1278a", features = ["std", "_test_utils"] }
rand = { version = "0.9.2", default-features = false, features = ["std", "thread_rng", "os_rng"] }
proptest = "1.0.0"
regex = "1.5.6"
Expand Down
16 changes: 8 additions & 8 deletions src/builder.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -435,16 +435,16 @@ impl NodeBuilder {
/// Configures the [`Node`] instance to source inbound liquidity from the given
/// [bLIP-51 / LSPS1] service.
///
/// Will mark the LSP as trusted for 0-confirmation channels, see [`Config::trusted_peers_0conf`].
/// Will mark the LSP as trusted for 0-confirmation, 0-reserve channels, see [`Config::trusted_peers_0conf_0reserve`].
///
/// The given `token` will be used by the LSP to authenticate the user.
///
/// [bLIP-51 / LSPS1]: https://github.com/lightning/blips/blob/master/blip-0051.md
pub fn set_liquidity_source_lsps1(
&mut self, node_id: PublicKey, address: SocketAddress, token: Option<String>,
) -> &mut Self {
// Mark the LSP as trusted for 0conf
self.config.trusted_peers_0conf.push(node_id.clone());
// Mark the LSP as trusted for 0conf, 0reserve
self.config.trusted_peers_0conf_0reserve.push(node_id.clone());

let liquidity_source_config =
self.liquidity_source_config.get_or_insert(LiquiditySourceConfig::default());
Expand All @@ -456,16 +456,16 @@ impl NodeBuilder {
/// Configures the [`Node`] instance to source just-in-time inbound liquidity from the given
/// [bLIP-52 / LSPS2] service.
///
/// Will mark the LSP as trusted for 0-confirmation channels, see [`Config::trusted_peers_0conf`].
/// Will mark the LSP as trusted for 0-confirmation, 0-reserve channels, see [`Config::trusted_peers_0conf_0reserve`].
///
/// The given `token` will be used by the LSP to authenticate the user.
///
/// [bLIP-52 / LSPS2]: https://github.com/lightning/blips/blob/master/blip-0052.md
pub fn set_liquidity_source_lsps2(
&mut self, node_id: PublicKey, address: SocketAddress, token: Option<String>,
) -> &mut Self {
// Mark the LSP as trusted for 0conf
self.config.trusted_peers_0conf.push(node_id.clone());
// Mark the LSP as trusted for 0conf, 0reserve
self.config.trusted_peers_0conf_0reserve.push(node_id.clone());

let liquidity_source_config =
self.liquidity_source_config.get_or_insert(LiquiditySourceConfig::default());
Expand Down Expand Up @@ -956,7 +956,7 @@ impl ArcedNodeBuilder {
/// Configures the [`Node`] instance to source inbound liquidity from the given
/// [bLIP-51 / LSPS1] service.
///
/// Will mark the LSP as trusted for 0-confirmation channels, see [`Config::trusted_peers_0conf`].
/// Will mark the LSP as trusted for 0-confirmation, 0-reserve channels, see [`Config::trusted_peers_0conf_0reserve`].
///
/// The given `token` will be used by the LSP to authenticate the user.
///
Expand All @@ -970,7 +970,7 @@ impl ArcedNodeBuilder {
/// Configures the [`Node`] instance to source just-in-time inbound liquidity from the given
/// [bLIP-52 / LSPS2] service.
///
/// Will mark the LSP as trusted for 0-confirmation channels, see [`Config::trusted_peers_0conf`].
/// Will mark the LSP as trusted for 0-confirmation, 0-reserve channels, see [`Config::trusted_peers_0conf_0reserve`].
///
/// The given `token` will be used by the LSP to authenticate the user.
///
Expand Down
22 changes: 14 additions & 8 deletions src/config.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -123,7 +123,7 @@ pub(crate) const LNURL_AUTH_TIMEOUT_SECS: u64 = 15;
/// | `listening_addresses` | None |
/// | `announcement_addresses` | None |
/// | `node_alias` | None |
/// | `trusted_peers_0conf` | [] |
/// | `trusted_peers_0conf_0reserve` | [] |
/// | `probing_liquidity_limit_multiplier` | 3 |
/// | `anchor_channels_config` | Some(..) |
/// | `route_parameters` | None |
Expand Down Expand Up @@ -156,12 +156,18 @@ pub struct Config {
/// **Note**: We will only allow opening and accepting public channels if the `node_alias` and the
/// `listening_addresses` are set.
pub node_alias: Option<NodeAlias>,
/// A list of peers that we allow to establish zero confirmation channels to us.
///
/// **Note:** Allowing payments via zero-confirmation channels is potentially insecure if the
/// funding transaction ends up never being confirmed on-chain. Zero-confirmation channels
/// should therefore only be accepted from trusted peers.
pub trusted_peers_0conf: Vec<PublicKey>,
/// A list of peers that we trust; these are peers that you've had some interaction with
/// out-of-band before clearing them to be on this list.
///
/// If a trusted peer opens a channel to us, we will forward their HTLCs before any
/// confirmations of the funding transaction (zero-conf), and allow them to spend their
/// entire balance (zero-reserve).
///
/// **Note:** Allowing payments via zero-confirmation channels is insecure if the funding
/// transaction never gets confirmed on-chain. Zero-reserve channels allow the peer to try
/// to steal your funds with no financial penalty. Zero-confirmation, and zero-reserve
/// channels should therefore only be accepted from trusted peers.
pub trusted_peers_0conf_0reserve: Vec<PublicKey>,
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@tnull tnull Apr 3, 2026

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Hmm, given the potentially very different usecases, I'm still not sure whether it makes sense to mix the two concepts like this. Should this maybe be a HashMap<PublicKey, TrustedChannelFeatures> to allow finer-grained control?

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@tankyleo tankyleo Apr 3, 2026

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  • As long as this only applies to inbound channels, I think these are similar use cases no ? If you trust your inbound peer with a 0-conf, you very likely also trust them with a 0-reserve channel, and vice versa.
  • On the main branch this list already applies only to inbound channels.
  • For a value set to TrustedChannelFeatures::ZeroConfZeroReserve in the hashmap, we would actually discard the ZeroConf bit for outbound channels, would this be a source of confusion ? "Hey I set my peer to trusted, and opened a channel to that peer, why is it not 0conf ?"
  • I think this would be quite easy to grok: "Hey this list only applies to inbound channels, if you want to open a zero-reserve yourself, see open_0reserve_channel."

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@benthecarman benthecarman Apr 3, 2026

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I think this would be quite easy to grok: "Hey this list only applies to inbound channels, if you want to open a zero-reserve yourself, see open_0reserve_channel."

If me and you want to open a 0 reserve channel to eachother, but don't want to accept 0 conf from eachother. Would open_0reserve_channel work? Or when I do open_0reserve_channel will your node just reject it because its not in the list?

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@tankyleo tankyleo Apr 3, 2026

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when alice calls open_0reserve_channel, she allows bob to spend his entire balance. Bob will accept regardless of whether Alice is on his "trusted peers" list.

If Bob has placed alice on his "trusted peers" list, bob in turn allows alice to spend her entire balance, and at the moment, allows alice to start immediately using the channel with 0-conf.

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@tankyleo tankyleo Apr 3, 2026

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I think this would be quite easy to grok: "Hey this list only applies to inbound channels, if you want to open a zero-reserve yourself, see open_0reserve_channel."

Added this in the commit below

/// The liquidity factor by which we filter the outgoing channels used for sending probes.
///
/// Channels with available liquidity less than the required amount times this value won't be
Expand Down Expand Up @@ -208,7 +214,7 @@ impl Default for Config {
network: DEFAULT_NETWORK,
listening_addresses: None,
announcement_addresses: None,
trusted_peers_0conf: Vec::new(),
trusted_peers_0conf_0reserve: Vec::new(),
probing_liquidity_limit_multiplier: DEFAULT_PROBING_LIQUIDITY_LIMIT_MULTIPLIER,
anchor_channels_config: Some(AnchorChannelsConfig::default()),
tor_config: None,
Expand Down
18 changes: 10 additions & 8 deletions src/event.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@ use lightning::events::{
ReplayEvent,
};
use lightning::impl_writeable_tlv_based_enum;
use lightning::ln::channelmanager::PaymentId;
use lightning::ln::channelmanager::{PaymentId, TrustedChannelFeatures};
use lightning::ln::types::ChannelId;
use lightning::routing::gossip::NodeId;
use lightning::sign::EntropySource;
Expand Down Expand Up @@ -1258,7 +1258,6 @@ where
let user_channel_id: u128 = u128::from_ne_bytes(
self.keys_manager.get_secure_random_bytes()[..16].try_into().unwrap(),
);
let allow_0conf = self.config.trusted_peers_0conf.contains(&counterparty_node_id);
let mut channel_override_config = None;
if let Some((lsp_node_id, _)) = self
.liquidity_source
Expand All @@ -1284,11 +1283,14 @@ where
});
}
}
let res = if allow_0conf {
self.channel_manager.accept_inbound_channel_from_trusted_peer_0conf(
let is_trusted_peer =
self.config.trusted_peers_0conf_0reserve.contains(&counterparty_node_id);
let res = if is_trusted_peer {
self.channel_manager.accept_inbound_channel_from_trusted_peer(
&temporary_channel_id,
&counterparty_node_id,
user_channel_id,
TrustedChannelFeatures::ZeroConfZeroReserve,
channel_override_config,
)
} else {
Expand All @@ -1305,21 +1307,21 @@ where
log_info!(
self.logger,
"Accepting inbound{}{} channel of {}sats from{} peer {}",
if allow_0conf { " 0conf" } else { "" },
if is_trusted_peer { " 0conf, 0reserve" } else { "" },
if anchor_channel { " Anchor" } else { "" },
funding_satoshis,
if allow_0conf { " trusted" } else { "" },
if is_trusted_peer { " trusted" } else { "" },
counterparty_node_id,
);
},
Err(e) => {
log_error!(
self.logger,
"Error while accepting inbound{}{} channel from{} peer {}: {:?}",
if allow_0conf { " 0conf" } else { "" },
if is_trusted_peer { " 0conf, 0reserve" } else { "" },
if anchor_channel { " Anchor" } else { "" },
counterparty_node_id,
if allow_0conf { " trusted" } else { "" },
if is_trusted_peer { " trusted" } else { "" },
e,
);
},
Expand Down
123 changes: 112 additions & 11 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1128,7 +1128,7 @@ impl Node {
fn open_channel_inner(
&self, node_id: PublicKey, address: SocketAddress, channel_amount_sats: FundingAmount,
push_to_counterparty_msat: Option<u64>, channel_config: Option<ChannelConfig>,
announce_for_forwarding: bool,
announce_for_forwarding: bool, set_0reserve: bool,
) -> Result<UserChannelId, Error> {
if !*self.is_running.read().unwrap() {
return Err(Error::NotRunning);
Expand Down Expand Up @@ -1196,25 +1196,46 @@ impl Node {
self.keys_manager.get_secure_random_bytes()[..16].try_into().unwrap(),
);

match self.channel_manager.create_channel(
peer_info.node_id,
channel_amount_sats,
push_msat,
user_channel_id,
None,
Some(user_config),
) {
let result = if set_0reserve {
self.channel_manager.create_channel_to_trusted_peer_0reserve(
peer_info.node_id,
channel_amount_sats,
push_msat,
user_channel_id,
None,
Some(user_config),
)
} else {
self.channel_manager.create_channel(
peer_info.node_id,
channel_amount_sats,
push_msat,
user_channel_id,
None,
Some(user_config),
)
};

let zero_reserve_string = if set_0reserve { "0reserve " } else { "" };

match result {
Ok(_) => {
log_info!(
self.logger,
"Initiated channel creation with peer {}. ",
"Initiated {}channel creation with peer {}. ",
zero_reserve_string,
peer_info.node_id
);
self.peer_store.add_peer(peer_info)?;
Ok(UserChannelId(user_channel_id))
},
Err(e) => {
log_error!(self.logger, "Failed to initiate channel creation: {:?}", e);
log_error!(
self.logger,
"Failed to initiate {}channel creation: {:?}",
zero_reserve_string,
e
);
Err(Error::ChannelCreationFailed)
},
}
Expand Down Expand Up @@ -1290,6 +1311,7 @@ impl Node {
push_to_counterparty_msat,
channel_config,
false,
false,
)
}

Expand Down Expand Up @@ -1330,6 +1352,7 @@ impl Node {
push_to_counterparty_msat,
channel_config,
true,
false,
)
}

Expand Down Expand Up @@ -1358,6 +1381,7 @@ impl Node {
push_to_counterparty_msat,
channel_config,
false,
false,
)
}

Expand Down Expand Up @@ -1395,6 +1419,83 @@ impl Node {
push_to_counterparty_msat,
channel_config,
true,
false,
)
}

/// Connect to a node and open a new unannounced, zero-reserve channel.
///
/// Zero-reserve channels allow the channel counterparty to try to steal your funds with
/// no financial penalty, so zero-reserve channels should only be opened to parties you
/// trust.
///
/// Note that this only allows *the counterparty* to spend *their* entire balance in the
/// the channel; whether *you* are allowed to spend your own full balance is the
/// counterparty's decision. See [`Config::trusted_peers_0conf_0reserve`] if the
/// counterparty would like to set zero-reserve on your own balance as well.
///
/// Disconnects and reconnects are handled automatically.
///
/// If `push_to_counterparty_msat` is set, the given value will be pushed (read: sent) to the
/// channel counterparty on channel open. This can be useful to start out with the balance not
/// entirely shifted to one side, therefore allowing to receive payments from the getgo.
///
/// If Anchor channels are enabled, this will ensure the configured
/// [`AnchorChannelsConfig::per_channel_reserve_sats`] is available and will be retained before
/// opening the channel.
///
/// Returns a [`UserChannelId`] allowing to locally keep track of the channel.
///
/// [`Config::trusted_peers_0conf_0reserve`]: crate::config::Config::trusted_peers_0conf_0reserve
/// [`AnchorChannelsConfig::per_channel_reserve_sats`]: crate::config::AnchorChannelsConfig::per_channel_reserve_sats
pub fn open_0reserve_channel(
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@tnull tnull Apr 3, 2026

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If we go ahead with these new APIs, they need to be exposed in uniffi bindings.

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@tankyleo tankyleo Apr 3, 2026

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Done below

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@benthecarman benthecarman Apr 3, 2026

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we are getting a combinatorial explosion with these

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@tankyleo tankyleo Apr 3, 2026

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Discussed offline, we retain separate calls for now, and will ship your ChannelBuilder::new().with_no_reserve().announced().fund_withall() suggestion in case there is further expansion of these calls.

&self, node_id: PublicKey, address: SocketAddress, channel_amount_sats: u64,
push_to_counterparty_msat: Option<u64>, channel_config: Option<ChannelConfig>,
) -> Result<UserChannelId, Error> {
self.open_channel_inner(
node_id,
address,
FundingAmount::Exact { amount_sats: channel_amount_sats },
push_to_counterparty_msat,
channel_config,
false,
true,
)
}

/// Connect to a node and open a new unannounced, zero-reserve channel, using all available
/// on-chain funds minus fees and anchor reserves.
///
/// Zero-reserve channels allow the channel counterparty to try to steal your funds with
/// no financial penalty, so zero-reserve channels should only be opened to parties you
/// trust.
///
/// Note that this only allows *the counterparty* to spend *their* entire balance in the
/// the channel; whether *you* are allowed to spend your own full balance is the
/// counterparty's decision. See [`Config::trusted_peers_0conf_0reserve`] if the
/// counterparty would like to set zero-reserve on your own balance as well.
///
/// Disconnects and reconnects are handled automatically.
///
/// If `push_to_counterparty_msat` is set, the given value will be pushed (read: sent) to the
/// channel counterparty on channel open. This can be useful to start out with the balance not
/// entirely shifted to one side, therefore allowing to receive payments from the getgo.
///
/// Returns a [`UserChannelId`] allowing to locally keep track of the channel.
///
/// [`Config::trusted_peers_0conf_0reserve`]: crate::config::Config::trusted_peers_0conf_0reserve
pub fn open_0reserve_channel_with_all(
&self, node_id: PublicKey, address: SocketAddress, push_to_counterparty_msat: Option<u64>,
channel_config: Option<ChannelConfig>,
) -> Result<UserChannelId, Error> {
self.open_channel_inner(
node_id,
address,
FundingAmount::Max,
push_to_counterparty_msat,
channel_config,
false,
true,
)
}

Expand Down
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