LEGACY - A channel using the legacy commitment format having tweaked to_remote keys.
SCRIPT_ENFORCED_LEASE - A channel that uses a commitment type that builds upon the anchors commitment format, but in addition requires a CLTV clause to spend outputs paying to the channel initiator. This is intended for use on leased channels to guarantee that the channel initiator has no incentives to close a leased channel before its maturity date.
STATIC_REMOTE_KEY - A channel that uses the modern commitment format where the key in the output of the remote party does not change each state. This makes back up and recovery easier as when the channel is closed, the funds go directly to that key.
UNKNOWN_COMMITMENT_TYPE - Returned when the commitment type isn't known or unavailable.
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ANCHORS - A channel that uses a commitment format that has anchor outputs on the commitments, allowing fee bumping after a force close transaction has been broadcast.