Channel Resolution Reconstruction

[carlaKC]

The on chain transactions required to fully resolve a channel on chain will be persisted by lightningnetwork/lnd/4157. However, this data will only be present for channels that are closed after the node upgrades to a version of lnd running this change. This leaves many projects without tools to accurately account for previously closed channels.

Given a channel ID, examine the closing transaction (and subsequent transactions) on chain to determine the resolutions that occurred on chain. This will require a connection to a node with --txindex enabled.

• Optionally allow faraday to connect directly to a node ()
• Add ChannelResolutions endpoint which optimistically queries lnd
• If no resolutions are persisted, and Faraday is connected to a node, get resolutions from chain
• For first iteration, keep resolutions in memory; consider persisting further on