  (string, optional, default="") An optional label
3. rescan     (boolean, optional, default=true) Rescan the wallet for transactions
4. p2sh       (boolean, optional, default=false) Add the P2SH version of the script as well

Result:
null    (json null)

Examples:

Import an address with rescan
> bitcoin-cli importaddress "myaddress"

Import using a label without rescan
> bitcoin-cli importaddress "myaddress" "testing" false

As a JSON-RPC call
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id