See the Bitcoin Optech entry on staking credentials to solve jamming (Bitcoin Optech Newsletter #228 | Bitcoin Optech).The o’reilly p2p design book chapter on accountability (Peer-To-Peer: Harnessing the Power of Disruptive Technologies: Chapter 16: Accountability) is also a classic.
I’m not going to comment more on the subject, but some kind of monetary credential protocol would be very useful for the btc ecosystem, and given I’m interested in it for some bitcoin backbone experiments, I’ll likely go to implement one anyway.