cdk/crates/lightning/cdk-ldk-node

CDK LDK Node

CDK lightning backend for ldk-node, providing Lightning Network functionality for CDK with support for Cashu operations.

Features

• Lightning Network payments (Bolt11 and Bolt12)
• Channel management
• Payment processing for Cashu mint operations
• Web management interface
• Support for multiple Bitcoin networks (Mainnet, Testnet, Signet/Mutinynet, Regtest)
• RGS (Rapid Gossip Sync) and P2P gossip support

Quick Start

Mutinynet (Recommended for Testing)

# Using environment variables (simplest)
export CDK_MINTD_LN_BACKEND="ldk-node"
export CDK_MINTD_LDK_NODE_BITCOIN_NETWORK="signet"
export CDK_MINTD_LDK_NODE_ESPLORA_URL="https://mutinynet.com/api"
export CDK_MINTD_LDK_NODE_RGS_URL="https://rgs.mutinynet.com/snapshot/0"
export CDK_MINTD_LDK_NODE_GOSSIP_SOURCE_TYPE="rgs"

cdk-mintd

After starting:

• Mint API: http://127.0.0.1:8085
• LDK management interface: http://127.0.0.1:8091
• Get test sats: mutinynet.com

For complete network configuration examples, Docker setup, and production deployment, see NETWORK_GUIDE.md.

Web Management Interface

The CDK LDK Node includes a built-in web management interface accessible at http://127.0.0.1:8091 by default.

⚠️ SECURITY WARNING: The web management interface has NO AUTHENTICATION and allows sending funds and managing channels. NEVER expose it publicly without proper authentication/authorization in front of it. Only bind to localhost (127.0.0.1) for security.

Key Features

• Dashboard: Node status, balance, and recent activity
• Channel Management: Open and close Lightning channels
• Payment Management: Create invoices, send payments, view history with pagination
• On-chain Operations: View balances and manage transactions

Configuration

[ldk_node]
webserver_host = "127.0.0.1"  # IMPORTANT: Only localhost for security
webserver_port = 8091  # 0 = auto-assign port

Or via environment variables:

• CDK_MINTD_LDK_NODE_WEBSERVER_HOST
• CDK_MINTD_LDK_NODE_WEBSERVER_PORT

Basic Configuration

Config File Example

[ln]
ln_backend = "ldk-node"

[ldk_node]
bitcoin_network = "signet"  # mainnet, testnet, signet, regtest
esplora_url = "https://mutinynet.com/api"
rgs_url = "https://rgs.mutinynet.com/snapshot/0"
gossip_source_type = "rgs"  # rgs or p2p
webserver_port = 8091

Environment Variables

All options can be set with CDK_MINTD_LDK_NODE_ prefix:

• CDK_MINTD_LDK_NODE_BITCOIN_NETWORK
• CDK_MINTD_LDK_NODE_ESPLORA_URL
• CDK_MINTD_LDK_NODE_RGS_URL
• CDK_MINTD_LDK_NODE_GOSSIP_SOURCE_TYPE

For detailed network configurations, Docker setup, production deployment, and troubleshooting, see NETWORK_GUIDE.md.