ChatBoostSourceGiveaway
The boost was obtained by the creation of a Telegram Premium or a Telegram Star giveaway. This boosts the chat 4 times for the duration of the corresponding Telegram Premium subscription for Telegram Premium giveaways and prize_star_count / 500 times for one year for Telegram Star giveaways.
Fields
sourceString = giveawayRequiredSource of the boost, always "giveaway"
giveaway_message_idIntegerRequiredIdentifier of a message in the chat with the giveaway; the message could have been deleted already. May be 0 if the message isn't sent yet.
Optional. User that won the prize in the giveaway if any; for Telegram Premium giveaways only
prize_star_countIntegerOptionalOptional. The number of Telegram Stars to be split between giveaway winners; for Telegram Star giveaways only
is_unclaimedTrueOptionalOptional. True, if the giveaway was completed, but there was no user to win the prize