one1prefix, however Ethereum style hex address can also be used. For example:
one1pdv9lrdwl0rg5vglh4xtyrv3wjk3wsqket7zxybech32 address is equivalent to
0x0B585F8DaEfBC68a311FbD4cB20d9174aD174016hex address. Quick way to convert between formats is using explorer: https://explorer.harmony.one/#/address/one1pdv9lrdwl0rg5vglh4xtyrv3wjk3wsqket7zxy, at the top you will find "Address Format" ONE | ETH options.
toShardID), which is where it differs from Ethereum v1.