docs: def rpc_connect(self):
          """Connect to a coin daemon's JSON RPC interface.
  
          Returns:
            bool: True if successfully connected, False otherwise.
  
          """
          if self.coin in COINS:
              rpc_url = COINS[self.coin]["rpc-url"] + ":"
              if self.testnet:
                  rpc_url += COINS[self.coin]["rpc-port-testnet"]
              else:
                  rpc_url += COINS[self.coin]["rpc-port"]
              self.rpc = pyjsonrpc.HttpClient(
                  url=rpc_url,
                  username=COINS[self.coin]["rpc-user"],
                  password=COINS[self.coin]["rpc-password"]
              )
              self.logger.debug(self.coin, "RPC connection ok")
              self.connected = True
          else:
              self.logger.debug(self.coin, "bridge not found")
          return self.connected