This is a recent article, but it's talking about the bitcoin craze in the early 2010s.

> Having set down those words, and blowing a gaping hole in the myth of Bitcoin’s inherent untraceability, Meiklejohn, Savage, and her other adviser Geoffrey Voelker started brainstorming a clever title.

I was never involved with any cryptocurrency, so probably don't remember very well, but was bitcoin ever considered anonymous with its public transaction ledger? Or it's obvious here only retroactively, and at the time nobody knew it?