Currency-abstraction for mining rewards was planned for Serenity, and so on, and so is out there as an idea. I thought about "signature-abstraction", so that different digital signatures could compete within a single state. Would that make sense in the context of Ethereum or Ethereum 2.0?
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Somehow related is account abstraction ethereum.stackexchange.com/questions/18977/…. An account will have code to verify transactions, and will be able to use a different type of signature. – Ismael Oct 13 '17 at 18:12
