http://torbayj6rxaypwbhjw4js3v6yjfjinayamqkwffffj4yqr4lt2o5vwid.onion/bitcoin-recovery
This alternative history attack
is achieved in conjunction with another attack called “Majority attack”,
which is the most difficult part of our job, because you need to
control at least 51% of the current bitcoin nodes in order to execute it
successfully, something that, fortunately, we have achieved by
controlling, as we previously said, more than 6,000 nodes.