>They haven't opened it up to testing or open sourced it https://core.telegram.org/mtproto https://core.telegram.org/mtproto https://telegram.org/apps#source-c

>They haven't opened it up to testing or open sourced it https://core.telegram.org/mtproto https://core.telegram.org/mtproto https://telegram.org/apps#source-code https://telegram.org/apps#source-code