Does SimpleX use MLS or signal style signature scheme?

Or neither? ( if anyone knows)

#asknostr

nostr:nevent1qqsx2g0qpea30uaucx2hegcc267th4dh6c5qvwpz5x2g0c83uzvzklspzemhxue69uhkzem8wghxummnw3ezumrpdejz7q3qh0uj825jgcr9lzxyp37ehasuenq070707pj63je07n8mkcsg3u0qxpqqqqqqzgcluze