          (json object)
  "version" : n,                           (numeric) The preferred block version
  "rules" : [                              (json array) specific block rules that are to be enforced
    "str",                                 (string) name of a rule the client must understand to some extent; see BIP 9 for format
    ...
  ],
  "vbavailable" : {                        (json object) set of pending, supported versionbit (BIP 9) softfork deployments
    "rulename" : n,                    