Essentially, the fingerprint. Emojis take up 32 bits each. So 4 emojis would be 128 bits. Of course, this doesn't account for all the 4 byte unicode combos th

Essentially, the fingerprint. Emojis take up 32 bits each. So 4 emojis would be 128 bits. Of course, this doesn't account for all the 4 byte unicode combos that don't result in an emoji, but still.