For more info on BOLTs, Andreas : Andreas Antonopoulos' book gives more info on that. Here's an excerpt:

Unlike Bitcoin, where the standard is defined by a reference implementation in software (Bitcoin
Core), in Lightning the standard is defined by a series of standards documents called Basis of
Lightning Technology (BOLT), found at the lightning-rfc repository.

There is no reference implementation of the Lightning Network, but there are several competing,
BOLT-compliant, and interoperable implementations developed by different teams and
organizations. The teams that develop software for the Lightning Network also contribute in the
development and evolution of the BOLT standards.

Another major difference between Lightning node software and Bitcoin node software is that
Lightning nodes do not need to operate in lockstep with consensus rules and can have extended
functionality beyond the baseline of the BOLTs. Therefore, different teams may pursue various
experimental features that, if successful and broadly deployed, may become part of the BOLTs later.

Mastering the Lightning Network: A Second Layer Blockchain Protocol for Instant Bitcoin Payments
#42448
http://library.lol/main/F4EE7BAA4FA0154EDD0C221CEE9E3174