Encoding Commands

encode and decode :
    base58-encode         encode a base16 string to a base58 string
    base58-decode         decode a base58 string to a base16 string
    base58check-encode    encode a base58check string
    base58check-decode    decode a base58check string
    base64-decode         decode a base16 string to a base64 string
    base64-encode         encode a base64 string to a base16 string
    rlp-encode            encode a string to a rlp encoded base16 string
    rlp-decode            decode a rlp base16 string to a human-readble representation