You can search for identifiers within the package.
in-package search v0.2.0
module Util : sig ... end
module Alphabet : sig ... end
val zero : char
val convert : bytes -> int -> int -> bytes
val default_alphabet : string * int array
val flickr_alphabet : string * int array
val encode : ?alphabet:(string * int array) -> string -> string
val decode : ?alphabet:(string * int array) -> string -> string
type alphabet = Alphabet.t
exception Invalid_alphabet
exception Invalid_base58_character
val make_alphabet : string -> string * int array