I wouldn’t know about the speed bump. They are dumping the water on the ice to refreeze it, though.

It potentially can help verifying that a recorded message/digital data originates from you (or any other person). It can’t help with the misinformation in the data itself. See also: https://lemm.ee/post/23366395

Apparently unrelenting DDOS attack, possibly because they defederated from some instances.