This library depends on base16-bytestring, which in version 1.0 changed the decode function from ByteString -> (ByteString, ByteString) to ByteString -> Either String ByteString, which newly can error. The replacement for the previous behavior of decode (which never failed), seems to be decodeLenient, for which I have a fix prepared here.

I suggest to add a version constraint for base16-bytestring < 1.0 to all current versions, and to release a new version that includes a fix for this, with a constraint for base16-bytestring >= 1.0 then.