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This is against the rules. p3 - "Neither of you is allowed to look at face-down cards in the Offering areas, no matter who placed them!"

Yes sure but the game is thought to be play live. In turn-based, it is very confusing tbh and I agree something should be done about that.

I very much doubt, that publishers of the game would agree to add here any option, which goes against the rules of the game.
Especially when there is an easy workaround for asynchronous games - there is a Notes option, which allows you to write down any reminders about played cards you want.

I would find it useful for asynch games for the game log to say what card was placed in which offer and by whom. For the cards placed with a trap token - have a record of "player x place a card in offer 1 with trap token", and for your cards have it say "you played x card in offer 1 with a trap token". Many games have an impelentation in the game log whereby if I say in Ticket to Ride draw from the deck - for me it will say I drew 2x orange trains but for everyone else it will say I just drew 2 cards from the deck. When it can be 24+ hours between turns, even using notes can be extremely difficult if you're not familiar with what every card is.

I agree with Nyom7 at the least it needs to say who placed in what offers. The notes section as suggested above works fine but without the log being updated to be more useful the note is pretty useless. I have no idea in my current came if the two face down cards are the ones I placed or my opponent because it's been too long for me to remember. Rules have been adapted slightly to take async in mind before on BGA and it will again. I'm sure it would be easy to implement in this case as knowing who placed what where up to 2 days later doesn't break the reason to not be able to look at the cards per the rules.