See multiformats.
use Multibase;
say Multibase::encode "Hello π ", :base58btc; # zStV1DL6DB8sfxsZ
say Multibase::encode "bonjour π ", :base16upper; # F626F6E6A6F757220F09F988920
say Multibase::decode("MYnllIPCfkYsg").decode("utf8"); # bye π