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Very interested in this. > Does VLS support plugable signing backends? We currently just use `InMemorySigner` internally, but we could abstract this to the `Sign` trait, which would seem to...

You might be interested in doing a system test, such as this one for *lnrod*: https://gitlab.com/lightning-signer/lnrod/-/blob/master/tests/integration-test.py Note also the Docker method of launching that, at top level of the repo.