How does a crypto operator in a client relationship protect themselves against duress? We are already starting to see digital robberies, because crypto clients are typically anonymous and can use a range of access point the rick of Crypto-ATM robberies is increasing. A two factor authorization and a silent alarm would be easy to set up- but this presents the risk that the silent alarm keeper could freeze accounts and make demands of clients. A "two key" system can be used to ensure transactions and blocks are only made with the simultaneous cooperation of the Client and broker, but as with TOR if unilateral blocking is not possible the systematic takeover of brokering services is likely to eventuate. While in theory if the broker was a bad-actor they still wouldn't gain access, the client would loose their protection without their knowledge- and a large number of bad-actor brokers would emerge to net a large number of clients.
Is this a problem inherent to a single origin (client centered) authorization chain? Could the blockchain work in tandem in a two factor access system?