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There was a TODO in chain.go that said
TODO: A minute timeout is used to prevent the handler
loop from blocking here forever, but this is much larger
than it needs to be due to btcd processing websocket
requests synchronously (see
btcsuite/btcd#504). Decrease
this to something saner like 3s when the above issue is
fixed.
It looks like issue 504 has been resolved so I took care of the TODO.