🙏 📎 Emoji that checksum! 🎉 💩
I attempted a curated list of 256 emojis that are not entirely similar. Using http://www.webpagefx.com/tools/emoji-cheat-sheet/ to compare them. I went with 256 as that is 8bit/1byte, and the hexadecimal output that is 2 hex characters.
So 1 emoji is 2 hex positions.