Unspecified Bolt Protocol Extensions
Often times nodes need to communicate with each other what their implementation is, looking for specific features that are only in select implementations, the desired feature is a question of node implementation.
A concept of Unspecified protocol extensions has been
proposed, they are unspecified as they are not part
of the BOLT specifications, each extension must have a set of random
type bigger than a certain number. Using the concept of
current extension, any extensions that are unidentified by a node will not be
recognized, while if the node’s implementation identifies this unspecified
extension, both nodes can continue communications knowing that they have the
same set of extra features.
Another possible implementation here is having feature bits having 1s for the features your node can recognize and 0 otherwise, this will grow with the number of extra features supported and so the first implementation can be more plausible.
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