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In some cases an OCN Node will need to modify data (typically to make URLs work for recipients). The signature can be modified by an OCN Node, but they must state the properties that they changed and sign any new data. More information about message signing and verification can be found [here](here: Make your backend service OCN-ready (OCPI 2.2 API + OCN Signature) .
By default message signing is turned on, but it can also be set with ocn.node.signatures=true if not.
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