To give more freedom in using Bits, having a Bits escrow system would be great.
RFC0011 ( https://discuss.dev.twitch.tv/t/rfc-0011-extension-entitlement-service/19142 ) introduced that idea but was never implemented.

What would be the possible flows:
- A viewer sends Bits, that are put "on hold"
- The streamer cancels the action asked by the viewers (because the stream is ending for example)
- After some delay, the Bits are refunded to the viewer because the transaction was not validated.

-- Viewers send Bits, that are put "on hold"
- The streamer cancels the action asked by the viewers (because the stream is ending for example)
- The Extension backend send a cancelation order to Twitch, canceling the Bits transaction.
- The Bits are refunded to the viewer because the transaction was not validated.
- If the transaction is not canceled, the Bits are sent to the streamer after the cancelation period expires.

In a practical way, it would be nice to have a way to cancel a Bits transaction before a certain limit of time.
This way we can create experiences that are safer for broadcasters and viewers because they are guaranteed to have the Bits used only when the conditions are met.
We could also use this system to handle server-side errors to refund people that used Bits something went wrong.