Actors is a general term that refers to something that is interacting with the network or protocols. Whilst most actors will be human, there could well be automated or AI driven actors that also influence how the system functions. Likewise, a group of entities could be considered as a single “actor” if they are behaving in a coordinated way.
An attacker is simple a malicious actor who intends to use or subvert the systems incentive structures or protocols for their own purpose or gain.
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