I've gone through this same exercise in the past in order to mass-delete a large number of comments on different threads. I was afraid that Blind may one day suffer a data leak. I attempted to reroll the crypto in Ruby, but ultimately failed and went the JS route, same as the author. I also had to roll my own sesion-token refresh logic. Finally I was wondering if any kind of data mining could be done with the tool, but I never took it that far. Thanks for the writeup!